Article(id=1280817534341465067, tenantId=1146029695717560320, journalId=1192105938417971205, issueId=1280817479555462000, articleNumber=null, orderNo=null, doi=10.13343/j.cnki.wsxb.20250819, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1761840000000, receivedDateStr=2025-10-31, revisedDate=null, revisedDateStr=null, acceptedDate=1770912000000, acceptedDateStr=2026-02-13, onlineDate=1783300296625, onlineDateStr=2026-07-06, pubDate=1783094400000, pubDateStr=2026-07-04, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1783300296625, onlineIssueDateStr=2026-07-06, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1783300296625, creator=13701087609, updateTime=1783300296625, updator=13701087609, issue=Issue{id=1280817479555462000, tenantId=1146029695717560320, journalId=1192105938417971205, year='2026', volume='66', issue='7', pageStart='3121', pageEnd='3677', issueExtLink='null', onlineDate='null', pubDate='1783094400000', pubDateStr='2026-07-04', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=1, specialIssue=null, createTime=1783300283564, creator='13701087609', updateTime=1783326087324, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1280925708813832745, tenantId=1146029695717560320, journalId=1192105938417971205, issueId=1280817479555462000, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1280925708813832746, tenantId=1146029695717560320, journalId=1192105938417971205, issueId=1280817479555462000, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=3324, endPage=3336, ext={EN=ArticleExt(id=1280817534710563820, articleId=1280817534341465067, tenantId=1146029695717560320, journalId=1192105938417971205, language=EN, title=High-level expression and activity identification of chicken NK-lysin in Pichia pastoris, columnId=1192149543992045670, journalTitle=Acta Microbiologica Sinica, columnName=Research Article, runingTitle=null, highlight=null, articleAbstract=

Objective To achieve high-level expression and purification of the recombinant 9 kDa and 15 kDa chicken NK-lysin proteins (designated as cNKL9 and cNKL15) and evaluate their in vitro antibacterial and immunomodulatory activities. Methods The target genes—cNKL9 and cNKL15—were individually cloned into the pPIC9K vector to construct recombinant expression plasmids for heterologous expression in Pichia pastoris. After confirming the correct expression of the recombinant proteins via SDS-PAGE and Western blotting, we used nickel affinity chromatography to obtain highly purified recombinant cNKL9 and cNKL15 proteins. The in vitro antibacterial activitiesof recombinant proteins against Salmonella typhimurium and Escherichia coli O157:H7 were assessed by colony forming unit (CFU) assays. We measured the mRNA levels by RT-qPCR and analyzed the transcriptional changes of relevant cytokines after applying the recombinant proteins to the chicken macrophage cell line HD11. High-level expression of the recombinant proteins was achieved in a 15 L fermenter for scale-up culture via optimization of the high-density fermentation process. Results The P. pastoris expression plasmids pPIC9K-cNKL9 andpPIC9K-cNKL15 were successfully constructed. SDS-PAGE and Western blotting results revealed specific bands of recombinant cNKL9 and cNKL15 proteins in the culture supernatant, confirming the successful secretory expression of the target proteins. Antibacterial activity assay demonstrated that the recombinant cNKL9 protein exhibited significant inhibitory activities against both S. typhimurium and E. coli O157:H7, whereas the recombinant cNKL15 protein showed no obvious inhibitory effects on either pathogenic strain. RT-qPCR analysis showed that the recombinant cNKL15 protein significantly upregulated the transcription levels of cytokines such as CCL4 and CCL20 in HD11 cells, while the recombinant cNKL9 protein did not exhibit immunomodulatory activity. Furthermore, in the 15 L fermenter, the heterologous expression yields of cNKL9 and cNKL15 reached 0.64 g/L and 0.53 g/L, respectively. Conclusion For the first time, we achieved high-level expression of recombinant cNKL9 and cNKL15 proteins in the P. pastoris system. Specifically, cNKL9 exhibited inhibitory activities against S. typhimurium and E. coli O157:H7, while cNKL15 exerted immunomodulatory effects by upregulating the mRNA levels of cytokines in the chicken macrophage cell line HD11. These findings provide experimental evidence for the development of cNKL9 and cNKL15 as antibacterial or immunomodulatory agents, indicating their considerable application potential.

, authors=Sixuan CHEN, Meiyu SHI, Tao TU, Huoqing HUANG, Huiying LUO, Bin YAO, Yuan WANG, Honglian ZHANG, authorsList=Sixuan CHEN, Meiyu SHI, Tao TU, Huoqing HUANG, Huiying LUO, Bin YAO, Yuan WANG, Honglian ZHANG, authorCompany=null, correspAuthors=Yuan WANG, Honglian ZHANG, authorNote=null, correspAuthorsNote=
E-mail: WANG Yuan,
ZHANG Honglian,
, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1280817535876580341, articleId=1280817534341465067, tenantId=1146029695717560320, journalId=1192105938417971205, language=CN, title=鸡NK-lysin在毕赤酵母中的高效表达及活性鉴定, columnId=1192149544164012138, journalTitle=微生物学报, columnName=研究报告, runingTitle=null, highlight=null, articleAbstract=

目的 高效表达并纯化9 kDa和15 kDa鸡NK-lysin重组蛋白(cNKL9和cNKL15),评估其体外抗菌活性及免疫调节活性。 方法cNKL9cNKL15目的基因分别克隆至pPIC9K载体中,构建重组表达质粒进行异源表达。经SDS-PAGE分析及Western blotting特异性验证,确认重组蛋白正确表达后,通过镍亲和层析法获得高纯度的cNKL9和cNKL15重组蛋白。以鼠伤寒沙门氏菌和大肠埃希氏菌O157:H7为靶标菌株,采用平板活菌计数法(CFU法)评估重组蛋白的体外抗菌活性;通过RT-qPCR技术检测mRNA表达水平,分析重组蛋白处理HD11鸡巨噬细胞系后相关细胞因子的转录水平变化。在15 L发酵罐放大培养体系中,通过优化高密度发酵工艺实现重组蛋白的高效表达。 结果 成功构建毕赤酵母重组表达质粒pPIC9K-cNKL9和pPIC9K-cNKL15。SDS-PAGE及Western blotting验证结果显示,培养上清中可检测到重组cNKL9和cNKL15蛋白的特异性条带,证实目标蛋白已实现正确分泌表达。抑菌活性检测结果表明,重组cNKL9蛋白对鼠伤寒沙门氏菌及大肠埃希氏菌O157:H7均具有显著抗菌活性,而重组cNKL15蛋白对上述2株病原菌无明显抑制作用。RT-qPCR结果显示,重组cNKL15蛋白显著上调HD11细胞中CCL4、CCL20等细胞因子的基因转录水平,重组cNKL9蛋白则无此免疫调节作用。此外,在15 L发酵罐放大培养体系中,cNKL9和cNKL15的异源表达量分别可达0.64 g/L和0.53 g/L。 结论 本研究在毕赤酵母系统中实现了cNKL9和cNKL15蛋白的高效重组表达。其中,cNKL9蛋白对鼠伤寒沙门氏菌和大肠埃希氏菌O157:H7具有抗菌活性,cNKL15蛋白能够通过上调鸡巨噬细胞HD11中细胞因子的mRNA表达水平发挥免疫调节功能。上述结果为cNKL9和cNKL15蛋白作为抗菌或免疫调节产品的开发提供了实验依据,具有良好的应用前景。

, authors=陈思璇, 师美玉, 涂涛, 黄火清, 罗会颖, 姚斌, 王苑, 张红莲, authorsList=陈思璇, 师美玉, 涂涛, 黄火清, 罗会颖, 姚斌, 王苑, 张红莲, authorCompany=null, correspAuthors=王苑, 张红莲, authorNote=

作者贡献声明

陈思璇:实验操作,数据收集和处理,论文撰写和修改;师美玉,实验操作;涂涛:实验技术指导;黄火清:实验技术指导;罗会颖:研究构思和设计;姚斌:研究构思和设计;王苑:论文写作指导与修改;张红莲:实验设计,论文修改。

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Blood, 2010, 116(18): 3465-3474., articleTitle=Granulysin activates antigen-presenting cells through TLR4 and acts as an immune alarmin, refAbstract=null), Reference(id=1280925232189916027, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1280817534341465067, doi=null, pmid=null, pmcid=null, year=2020, volume=161, issue=3, pageStart=245, pageEnd=258, url=null, language=null, rfNumber=[33], rfOrder=32, authorNames=Sparrow EL, Fowler DW, Fenn J, Caron J, Copier J, Dalgleish AG, Bodman-Smith MD, journalName=Immunology, refType=null, unstructuredReference=Sparrow EL, Fowler DW, Fenn J, Caron J, Copier J, Dalgleish AG, Bodman-Smith MD. The cytotoxic molecule granulysin is capable of inducing either chemotaxis or fugetaxis in dendritic cells depending on maturation: a role for Vδ2+ γδ T cells in the modulation of immune response to tumour[J]. Immunology, 2020, 161(3): 245-258., articleTitle=The cytotoxic molecule granulysin is capable of inducing either chemotaxis or fugetaxis in dendritic cells depending on maturation: a role for Vδ2+ γδ T cells in the modulation of immune response to tumour, refAbstract=null)], funds=[Fund(id=1280925227815256914, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1280817534341465067, awardId=2022YFD1300701, language=EN, fundingSource=The National Key Research and Development Program of China(2022YFD1300701), fundOrder=null, country=null), Fund(id=1280925227886560083, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1280817534341465067, awardId=2022YFD1300701, language=CN, fundingSource=国家重点研发计划(2022YFD1300701), fundOrder=null, country=null), Fund(id=1280925227949474644, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1280817534341465067, awardId=32372915, language=EN, fundingSource=The National Natural Science Foundation of China(32372915), fundOrder=null, country=null), Fund(id=1280925228020777813, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1280817534341465067, awardId=32372915, language=CN, fundingSource=国家自然科学基金(32372915), fundOrder=null, country=null), Fund(id=1280925228087886678, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1280817534341465067, awardId=CARS-41, language=EN, fundingSource=The China Agriculture Research System(CARS-41), fundOrder=null, country=null), Fund(id=1280925228146606935, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1280817534341465067, awardId=CARS-41, language=CN, fundingSource=现代农业产业技术体系项目(CARS-41), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1280925220273898254, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1280817534341465067, xref=null, ext=[AuthorCompanyExt(id=1280925220282286863, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1280817534341465067, companyId=1280925220273898254, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=State Key Laboratory of Animal Nutrition and Feeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China), AuthorCompanyExt(id=1280925220294869776, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1280817534341465067, companyId=1280925220273898254, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=中国农业科学院北京畜牧兽医研究所,畜禽营养与饲养全国重点实验室,北京)])], figs=[ArticleFig(id=1280925225088959300, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1280817534341465067, language=EN, label=Figure 1, caption=Construction of the pPIC9K-cNKL9 and pPIC9K-cNKL15 expression plasmids. A: Schematic diagram of pPIC9K-cNKL9 and pPIC9K-cNKL15 expression plasmids construction; B: Agarose gel electrophoresis analysis of PCR-amplified fragments of cNKL9 and cNKL15 genes; C: Agarose gel electrophoresis analysis for validation of recombinant plasmids pPIC9K-cNKL9/cNKL15 construction. The recombinant plasmids were verified by PCR amplification with the 5′AOX and 3′AOX primers derived from the pPIC9K vector. Lane M: DNA marker., figureFileSmall=qmcCQ6a377opWZI/PwGP1A==, figureFileBig=nyiFYL6yhgC7udQNGhKP/w==, tableContent=null), ArticleFig(id=1280925225160262469, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1280817534341465067, language=CN, label=图1, caption=pPIC9K-cNKL9/cNKL15 表达质粒的构建, figureFileSmall=qmcCQ6a377opWZI/PwGP1A==, figureFileBig=nyiFYL6yhgC7udQNGhKP/w==, tableContent=null), ArticleFig(id=1280925225256731462, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1280817534341465067, language=EN, label=Figure 2, caption=Expression and purification of recombinant cNKL9 and cNKL15 proteins in Pichia pastoris. A: SDS-PAGE analysis of the expression of recombinant cNKL9 and cNKL15 proteins in the culture supernatants from two positive clones; B: Western blotting verification of recombinant proteins in the culture supernatant of two positive clones using an anti-His antibody; C: SDS-PAGE detection of purified recombinant cNKL9 and cNKL15 proteins. Lanes 1-2: The culture supernatant of two transformants; Lane 1×: One volume of protein sample; Lane 2×: Two volumes of protein sample., figureFileSmall=O3kUofuqFnyQTH5Epd5qeQ==, figureFileBig=KbJbWbqeLhLGk2tPOuRagg==, tableContent=null), ArticleFig(id=1280925225336423239, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1280817534341465067, language=CN, label=图2, caption=重组蛋白cNKL9cNKL15在毕赤酵母中的表达及纯化, figureFileSmall=O3kUofuqFnyQTH5Epd5qeQ==, figureFileBig=KbJbWbqeLhLGk2tPOuRagg==, tableContent=null), ArticleFig(id=1280925227035116360, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1280817534341465067, language=EN, label=Figure 3, caption=Antibacterial and immunomodulatory activities of recombinant cNKL9 and cNKL15 proteins. A: Relative survival rates of Salmonella typhimurium and Escherichia coli O157:H7 treated withrecombinant cNKL9 and cNKL15 proteins at different concentrations, compared with untreated control; B: mRNA expression levels of cytokines in HD11 cells treated with different concentrations of cNKL9 and cNKL15 proteins, detected by RT-qPCR. All data present the mean±SD from three independent experiments., figureFileSmall=n1i4ciImwEO+YxSZCln8gA==, figureFileBig=OPO6Dwpa2t24GyZJoVYBXw==, tableContent=null), ArticleFig(id=1280925227119002441, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1280817534341465067, language=CN, label=图3, caption=cNKL9cNKL15重组蛋白的抗菌活性及免疫调节活性, figureFileSmall=n1i4ciImwEO+YxSZCln8gA==, figureFileBig=OPO6Dwpa2t24GyZJoVYBXw==, tableContent=null), ArticleFig(id=1280925227202888522, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1280817534341465067, language=EN, label=Figure 4, caption=Optimization of high-density fermentation process and expression analysis of recombinant Pichia pastoris strains for cNKL9 and cNKL15 proteins. A: Changes in wet cell weight of recombinant strains during methanol induction; B: Changes in crude protein content in the high-density fermentation supernatants of recombinant strains at different induction times; C: SDS-PAGE analysis of target protein expression levels in the fermentation supernatants of recombinant strains at different induction times., figureFileSmall=6ldjKy6P/zUbTsfe0o2l1g==, figureFileBig=5jrj85vPlgcbt/8mmaVTDw==, tableContent=null), ArticleFig(id=1280925227282580299, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1280817534341465067, language=CN, label=图4, caption=毕赤酵母重组cNKL9cNKL15蛋白菌株的高密度发酵工艺优化与表达分析, figureFileSmall=6ldjKy6P/zUbTsfe0o2l1g==, figureFileBig=5jrj85vPlgcbt/8mmaVTDw==, tableContent=null), ArticleFig(id=1280925227349689164, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1280817534341465067, language=EN, label=Table 1, caption=

The sequences of the optimized cNKL9 and cNKL15 genes

, figureFileSmall=null, figureFileBig=null, tableContent=
Gene namesSequences (5′→3′)
cNKL9

ATCAAGTGCAGATTTTGTGTTTCTTTGGTTAAGAAAGTCCAGAAAA

TTGTTGGTGACGATCCAGACGAAGACGCTATCAACAACGCATTGAA

CAAGGTTTGTTCCACTGGTAGAAGACAAAGATCTATTTGTAAGCAA

CTTCTGAAGAAGTTGAGACAACAGTTGTCCGATGCCTTGCAGAACA

ATGACGATCCTAGAGATGTTTGTACTACATTGGGTCTGTGC

cNKL15

TTCTCTGGCTTGACCCCTGAGCATTCTGCTCTGGCTAGAGCTCATCCT

TGTGACGGCGAGCAATTTTGTCAGAACTTGGCACCAGAAGACCCAC

AAGGAGATCAATTACTTCAGAGAGAAGAACTTGGTTTGATCTGTGAG

TCTTGTAGAAAAATTATCCAAAAGTTGGAAGATATGGTTGGCCCTCAA

CCTAATGAGGATACCGTTACTCAGGCCGCTTCTAGAGTTTGTGATAAG

ATGAAGATTCTGAGAGGTGTTTGTAAAAAGATAATGAGAACCTTCTTG

AGAAGAATCTCCAAGGACATCTTGACTGGTAAAAAGCCACAAGCTAT

CTGTGTTGACATCAAGATCTGCAAGGAAAAGACCGGTTTGATT

), ArticleFig(id=1280925227412603725, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1280817534341465067, language=CN, label=表1, caption=

优化后的 cNKL9cNKL15 基因序列

, figureFileSmall=null, figureFileBig=null, tableContent=
Gene namesSequences (5′→3′)
cNKL9

ATCAAGTGCAGATTTTGTGTTTCTTTGGTTAAGAAAGTCCAGAAAA

TTGTTGGTGACGATCCAGACGAAGACGCTATCAACAACGCATTGAA

CAAGGTTTGTTCCACTGGTAGAAGACAAAGATCTATTTGTAAGCAA

CTTCTGAAGAAGTTGAGACAACAGTTGTCCGATGCCTTGCAGAACA

ATGACGATCCTAGAGATGTTTGTACTACATTGGGTCTGTGC

cNKL15

TTCTCTGGCTTGACCCCTGAGCATTCTGCTCTGGCTAGAGCTCATCCT

TGTGACGGCGAGCAATTTTGTCAGAACTTGGCACCAGAAGACCCAC

AAGGAGATCAATTACTTCAGAGAGAAGAACTTGGTTTGATCTGTGAG

TCTTGTAGAAAAATTATCCAAAAGTTGGAAGATATGGTTGGCCCTCAA

CCTAATGAGGATACCGTTACTCAGGCCGCTTCTAGAGTTTGTGATAAG

ATGAAGATTCTGAGAGGTGTTTGTAAAAAGATAATGAGAACCTTCTTG

AGAAGAATCTCCAAGGACATCTTGACTGGTAAAAAGCCACAAGCTAT

CTGTGTTGACATCAAGATCTGCAAGGAAAAGACCGGTTTGATT

), ArticleFig(id=1280925227479712590, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1280817534341465067, language=EN, label=Table 2, caption=

Primers used for vector construction

, figureFileSmall=null, figureFileBig=null, tableContent=
Primer namesPrimer sequences (5′→3′)
cNKL9-FGAAAAAAGAGAGGCTGAAGCTATCAAGTGCAGATTTTGTGTTTC
cNKL9-RCTTAATGGTGATGATGATGATGGCACAGACCCAATGTAGTAC
cNKL15-FGAAAAAAGAGAGGCTGAAGCTGAACCACCTAGAGATGATCAC
cNKL15-RCTTAATGGTGATGATGATGATGACCTTTGCACAGACCCAATGTAGTAC
5′AOXGACTGGTTCCAATTGACAAGC
3′AOXGCAAATGGCATTCTGACATCC
), ArticleFig(id=1280925227542627151, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1280817534341465067, language=CN, label=表2, caption=

载体构建所用引物

, figureFileSmall=null, figureFileBig=null, tableContent=
Primer namesPrimer sequences (5′→3′)
cNKL9-FGAAAAAAGAGAGGCTGAAGCTATCAAGTGCAGATTTTGTGTTTC
cNKL9-RCTTAATGGTGATGATGATGATGGCACAGACCCAATGTAGTAC
cNKL15-FGAAAAAAGAGAGGCTGAAGCTGAACCACCTAGAGATGATCAC
cNKL15-RCTTAATGGTGATGATGATGATGACCTTTGCACAGACCCAATGTAGTAC
5′AOXGACTGGTTCCAATTGACAAGC
3′AOXGCAAATGGCATTCTGACATCC
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Primers used for RT-qPCR

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Primer namesPrimer sequences (5′→3′)
CCL4-FGCTGCCCTTCAGCTTTG
CCL4-RTCAGTTCAGTTCCATCTTGTTCATGTA
CCL20-FGGCTTGAGCACCAAGAGTTTG
CCL20-RCCCTTAATGACCTTCCGAGGC
IL-1β-F[23]TGGGCATCAAGGGCTACA
IL-1β-R[23]TCGGGTTGGTTGGTGATG
IL-8-F[23]GGCTTGCTAGGGGAAATGA
IL-8-R[23]AGCTGACTCTGACTAGGAAACTGT
TNF-α-FTCAGGACAGCCTATGCCAAC
TNF-α-RCTTGGTTGCTTTGTGCCTGG
GAPDH-F[23]GGTGGTGCTAAGCGTGTTAT
GAPDH-R[23]ACCTCTGTCATCTCTCCACA
), ArticleFig(id=1280925227689427793, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1280817534341465067, language=CN, label=表3, caption=

RT-qPCR所用引物

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Primer namesPrimer sequences (5′→3′)
CCL4-FGCTGCCCTTCAGCTTTG
CCL4-RTCAGTTCAGTTCCATCTTGTTCATGTA
CCL20-FGGCTTGAGCACCAAGAGTTTG
CCL20-RCCCTTAATGACCTTCCGAGGC
IL-1β-F[23]TGGGCATCAAGGGCTACA
IL-1β-R[23]TCGGGTTGGTTGGTGATG
IL-8-F[23]GGCTTGCTAGGGGAAATGA
IL-8-R[23]AGCTGACTCTGACTAGGAAACTGT
TNF-α-FTCAGGACAGCCTATGCCAAC
TNF-α-RCTTGGTTGCTTTGTGCCTGG
GAPDH-F[23]GGTGGTGCTAAGCGTGTTAT
GAPDH-R[23]ACCTCTGTCATCTCTCCACA
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NK-lysin在毕赤酵母中的高效表达及活性鉴定
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陈思璇 , 师美玉 , 涂涛 , 黄火清 , 罗会颖 , 姚斌 , 王苑 , 张红莲
微生物学报 | 研究报告 2026,66(7): 3324-3336
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微生物学报 |研究报告 2026 , 66 (7) : 3324 -3336
NK-lysin在毕赤酵母中的高效表达及活性鉴定
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陈思璇, 师美玉, 涂涛, 黄火清, 罗会颖, 姚斌, 王苑 , 张红莲
作者信息
  • 中国农业科学院北京畜牧兽医研究所,畜禽营养与饲养全国重点实验室,北京
作者简介:

作者贡献声明

陈思璇:实验操作,数据收集和处理,论文撰写和修改;师美玉,实验操作;涂涛:实验技术指导;黄火清:实验技术指导;罗会颖:研究构思和设计;姚斌:研究构思和设计;王苑:论文写作指导与修改;张红莲:实验设计,论文修改。

High-level expression and activity identification of chicken NK-lysin in Pichia pastoris
Sixuan CHEN, Meiyu SHI, Tao TU, Huoqing HUANG, Huiying LUO, Bin YAO, Yuan WANG , Honglian ZHANG
Affiliations
  • State Key Laboratory of Animal Nutrition and Feeding, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China
出版时间: 2026-07-04 doi: 10.13343/j.cnki.wsxb.20250819
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目的 高效表达并纯化9 kDa和15 kDa鸡NK-lysin重组蛋白(cNKL9和cNKL15),评估其体外抗菌活性及免疫调节活性。 方法cNKL9cNKL15目的基因分别克隆至pPIC9K载体中,构建重组表达质粒进行异源表达。经SDS-PAGE分析及Western blotting特异性验证,确认重组蛋白正确表达后,通过镍亲和层析法获得高纯度的cNKL9和cNKL15重组蛋白。以鼠伤寒沙门氏菌和大肠埃希氏菌O157:H7为靶标菌株,采用平板活菌计数法(CFU法)评估重组蛋白的体外抗菌活性;通过RT-qPCR技术检测mRNA表达水平,分析重组蛋白处理HD11鸡巨噬细胞系后相关细胞因子的转录水平变化。在15 L发酵罐放大培养体系中,通过优化高密度发酵工艺实现重组蛋白的高效表达。 结果 成功构建毕赤酵母重组表达质粒pPIC9K-cNKL9和pPIC9K-cNKL15。SDS-PAGE及Western blotting验证结果显示,培养上清中可检测到重组cNKL9和cNKL15蛋白的特异性条带,证实目标蛋白已实现正确分泌表达。抑菌活性检测结果表明,重组cNKL9蛋白对鼠伤寒沙门氏菌及大肠埃希氏菌O157:H7均具有显著抗菌活性,而重组cNKL15蛋白对上述2株病原菌无明显抑制作用。RT-qPCR结果显示,重组cNKL15蛋白显著上调HD11细胞中CCL4、CCL20等细胞因子的基因转录水平,重组cNKL9蛋白则无此免疫调节作用。此外,在15 L发酵罐放大培养体系中,cNKL9和cNKL15的异源表达量分别可达0.64 g/L和0.53 g/L。 结论 本研究在毕赤酵母系统中实现了cNKL9和cNKL15蛋白的高效重组表达。其中,cNKL9蛋白对鼠伤寒沙门氏菌和大肠埃希氏菌O157:H7具有抗菌活性,cNKL15蛋白能够通过上调鸡巨噬细胞HD11中细胞因子的mRNA表达水平发挥免疫调节功能。上述结果为cNKL9和cNKL15蛋白作为抗菌或免疫调节产品的开发提供了实验依据,具有良好的应用前景。

NK-lysin基因  /  重组蛋白  /  毕赤酵母  /  抗菌活性  /  免疫调节活性

Objective To achieve high-level expression and purification of the recombinant 9 kDa and 15 kDa chicken NK-lysin proteins (designated as cNKL9 and cNKL15) and evaluate their in vitro antibacterial and immunomodulatory activities. Methods The target genes—cNKL9 and cNKL15—were individually cloned into the pPIC9K vector to construct recombinant expression plasmids for heterologous expression in Pichia pastoris. After confirming the correct expression of the recombinant proteins via SDS-PAGE and Western blotting, we used nickel affinity chromatography to obtain highly purified recombinant cNKL9 and cNKL15 proteins. The in vitro antibacterial activitiesof recombinant proteins against Salmonella typhimurium and Escherichia coli O157:H7 were assessed by colony forming unit (CFU) assays. We measured the mRNA levels by RT-qPCR and analyzed the transcriptional changes of relevant cytokines after applying the recombinant proteins to the chicken macrophage cell line HD11. High-level expression of the recombinant proteins was achieved in a 15 L fermenter for scale-up culture via optimization of the high-density fermentation process. Results The P. pastoris expression plasmids pPIC9K-cNKL9 andpPIC9K-cNKL15 were successfully constructed. SDS-PAGE and Western blotting results revealed specific bands of recombinant cNKL9 and cNKL15 proteins in the culture supernatant, confirming the successful secretory expression of the target proteins. Antibacterial activity assay demonstrated that the recombinant cNKL9 protein exhibited significant inhibitory activities against both S. typhimurium and E. coli O157:H7, whereas the recombinant cNKL15 protein showed no obvious inhibitory effects on either pathogenic strain. RT-qPCR analysis showed that the recombinant cNKL15 protein significantly upregulated the transcription levels of cytokines such as CCL4 and CCL20 in HD11 cells, while the recombinant cNKL9 protein did not exhibit immunomodulatory activity. Furthermore, in the 15 L fermenter, the heterologous expression yields of cNKL9 and cNKL15 reached 0.64 g/L and 0.53 g/L, respectively. Conclusion For the first time, we achieved high-level expression of recombinant cNKL9 and cNKL15 proteins in the P. pastoris system. Specifically, cNKL9 exhibited inhibitory activities against S. typhimurium and E. coli O157:H7, while cNKL15 exerted immunomodulatory effects by upregulating the mRNA levels of cytokines in the chicken macrophage cell line HD11. These findings provide experimental evidence for the development of cNKL9 and cNKL15 as antibacterial or immunomodulatory agents, indicating their considerable application potential.

chicken NK-lysin gene  /  recombinant proteins  /  Pichia pastoris  /  antibacterial activity  /  immunomodulatory activity
陈思璇, 师美玉, 涂涛, 黄火清, 罗会颖, 姚斌, 王苑, 张红莲. 鸡NK-lysin在毕赤酵母中的高效表达及活性鉴定. 微生物学报, 2026 , 66 (7) : 3324 -3336 . DOI: 10.13343/j.cnki.wsxb.20250819
Sixuan CHEN, Meiyu SHI, Tao TU, Huoqing HUANG, Huiying LUO, Bin YAO, Yuan WANG, Honglian ZHANG. High-level expression and activity identification of chicken NK-lysin in Pichia pastoris[J]. Acta Microbiologica Sinica, 2026 , 66 (7) : 3324 -3336 . DOI: 10.13343/j.cnki.wsxb.20250819
随着畜禽养殖规模的持续扩大,动物源性病原微生物的传播风险与抗生素耐药性问题日趋严峻。在全球范围内,细菌性禽类疾病每年造成巨大的经济损失,其中由沙门氏菌、大肠埃希氏菌等革兰氏阴性菌引发的感染尤为常见[1]。传统抗生素治疗不仅面临严格的监管限制,且随着耐药菌株的不断进化,其抗菌效果已显著下降[2]。这促使研究者更加关注天然免疫系统,尤其是具有广谱抗菌活性且不易诱导耐药性的天然免疫蛋白[3-4]。NK-lysin属于鞘脂激活蛋白saposin样蛋白(saposin-like protein, SAPLIP)家族成员,是由自然杀伤细胞(natural killer cells,NK细胞)和细胞毒性T淋巴细胞(cytotoxic T lymphocytes, CTL)分泌的关键天然免疫蛋白,成熟蛋白与穿孔素、颗粒酶一同存在于细胞毒性颗粒中[5-7]。NK-lysin最先从猪小肠组织中分离获得[8],随后,研究人员在鸡脾细胞、胸腺细胞和肠上皮淋巴细胞中鉴定出NK-lysin的鸡同源物[9]
NK-lysin基因定位于22号染色体远端,其表达产物主要以2种形式存在,即15 kDa前体蛋白(cNKL15)和9 kDa成熟蛋白(cNKL9)[10]。二者结构与颗粒溶素(granulysin, GNLY)及其他物种的NK-lysin同源物高度相似,包含6个半胱氨酸形成的3对二硫键及5个α-螺旋结构[5,9,11-13]。目前,针对cNKL9蛋白和cNKL15蛋白的外源重组表达及功能鉴定的研究鲜有报道。在cNKL15蛋白的外源表达方面,现有研究主要通过COS7细胞转染实现,所得重组cNKL15蛋白未表现出明显的抗菌活性,但具有抗艾美尔球虫活性,且可通过诱导细胞因子表达对巨噬细胞发挥免疫调节作用[14-15]。关于cNKL9蛋白的重组表达尚未见相关报道,但有研究通过化学合成获得全长cNKL9蛋白,证实其具备较强的抗菌活性[16]。此外,为探究不同α-螺旋区域的生物活性,部分研究基于蛋白结构合成了一系列短肽,发现其中某些短肽具有显著的抗菌活性、抗球虫活性或免疫调节活性[12,16-17]
巴斯德毕赤酵母(Pichia pastoris)是一种操作简便、生产成本低的高效真核表达系统[18]。其核心优势在于具有可严格调控外源蛋白表达的乙醇氧化酶(alcohol oxidase 1, AOX1)基因启动子[19];同时,作为真核生物,毕赤酵母具备完善的翻译后修饰能力,能在内质网中高效完成糖基化、二硫键形成等关键修饰,确保重组蛋白的天然构象与生物学活性[20]。此外,通过α-factor等信号肽引导,目标蛋白可分泌至培养基,并经内源KEX2蛋白酶切割信号肽,实现完整蛋白的分泌表达,从而大幅简化纯化步骤[21]。该表达系统还采用甘油/甲醇两阶段培养策略,以廉价碳源支持工程菌株的高密度发酵,便于实现工业化放大生产[22]。为高效表达cNKL9和cNKL15蛋白并系统比较二者的功能活性,本研究利用毕赤酵母表达系统完成了2种蛋白的重组表达与纯化,并对其抑菌活性及免疫调节活性进行了鉴定,同时通过发酵罐高密度培养实现了2种cNKL蛋白的高效制备,为其后续生产开发与应用奠定了实验基础。
毕赤酵母GS115菌株、载体pPIC9K,Invitrogen公司;大肠埃希氏菌TOP10感受态细胞,Biomed公司;鼠伤寒沙门氏菌(Salmonella typhimurium) CVCC541、大肠埃希氏菌(Escherichia coli) O157:H7 CVCC1491,本实验室保存菌株;HD11鸡巨噬细胞,浙江大学占秀安教授惠赠。
LB培养基(g/L):酵母提取物(yeast extract) 5.0,蛋白胨(tryptone) 10.0,氯化钠(NaCl) 10.0;固体培养基含琼脂粉(agar) 20.0 g/L,121 ℃灭菌21 min。
YPD培养基(g/L):酵母提取物10.0,蛋白胨20.0,葡萄糖(D-glucose) 20.0。固体培养基含琼脂粉20.0,121 ℃灭菌21 min。
MD培养基(g/L):葡萄糖20.0,琼脂糖20.0,121 ℃灭菌21 min,使用时加入无氨基酵母氮源(yeast nitrogen base without amino acids) 13.4,生物素(D-biotin) 4.0×10-4
BMGY培养基(g/L):酵母提取物10.0,蛋白胨20.0,丙三醇(glycerol) 10.0,121 ℃灭菌21 min,使用时加入无氨基酵母氮源13.4,生物素4.0×10-4
BMMY培养基(g/L):酵母提取物10.0,蛋白胨20.0,121 ℃灭菌21 min,使用时加入无氨基酵母氮源13.4,生物素4.0×10-4,甲醇(methanol)的体积分数为1%,每24 h补加体积分数为1%的甲醇。
HD11鸡巨噬细胞完全培养基:DMEM培养基含体积分数为10%的胎牛血清(fetal bovine serum)和体积分数为1%的青霉素/链霉素(penicillin-streptomycin)。
在GenBank中获得cNKL15基因的氨基酸序列(序列号:NM_001044680.2),根据毕赤酵母的密码子偏好性(http://www.kazusa.or.jp/codon/)对cNKL15基因序列进行密码子优化,优化后的基因序列见表1,通过基因合成获得cNKL15基因。对cNKL15蛋白序列及结构进行分析,得到成熟蛋白cNKL9对应的序列(cNKL15 N端去除43个氨基酸,C端去除2个氨基酸)。为便于后续目的蛋白的检测和纯化,在cNKL9和cNKL15羧基端添加6×His标签。利用表2中2对特异性引物,以cNKL15基因为模板使用DNA聚合酶(南京诺唯赞生物科技股份有限公司)进行PCR扩增,获得cNKL9cNKL15基因片段。利用同源重组酶(北京全式金生物技术有限公司)将目的基因与pPIC9K载体进行同源重组,并转化至大肠埃希氏菌TOP10感受态细胞,转化产物涂布于含氨苄青霉素(100 µg/mL)的LB固体培养基进行抗性筛选。挑取单菌落进行扩大培养,使用质粒小提中量试剂盒(北京庄盟国际生物基因科技有限公司)提取重组质粒,并送北京睿博兴科生物技术有限公司测序鉴定,对测序正确的质粒,进一步以载体上的5′AOX3′AOX引物进行PCR扩增,验证目的基因是否准确插入pPIC9K载体的AOX1位点。通过化学预处理法制备毕赤酵母GS115感受态细胞,使用Bgl Ⅱ酶[宝日医生物技术(北京)有限公司]将鉴定正确的重组质粒进行线性化处理,再通过电转化法转化毕赤酵母GS115感受态细胞。转化产物涂布于组氨酸缺陷型MD固体培养基上进行筛选。
在MD平板上随机选取约10个转化子单菌落,将其接种于含3 mL BMGY培养基的塑料无菌试管中,30 ℃、200 r/min条件下富集培养48 h。将菌液4 500 r/min离心5 min,弃上清,用1 mL BMMY培养基重悬菌体,在同一培养条件下诱导蛋白表达。48 h后,通过SDS-PAGE和使用抗6×His标签鼠单克隆抗体(北京全式金生物技术有限公司)进行Western blotting,检测培养上清液中目标蛋白cNKL9和cNKL15的表达水平。选取表达量较高的2个菌株进行保种,菌液与40%甘油以1:1的比例混合保存于EP管中,置于-80 ℃冰箱保存。
选择表达量最高的cNKL9菌株和cNKL15菌株进行摇瓶发酵,在30 ℃、200 r/min条件下分别使用800 mL BMGY培养基进行富集培养48 h,以及400 mL BMMY培养基进行甲醇诱导表达48 h。将发酵液于4 ℃、12 000 r/min离心10 min,收集上清液,经0.45 μm和0.22 μm滤膜过滤后,通过镍亲和层析柱对蛋白进行纯化。层析柱预先使用含20 mmol/L磷酸盐缓冲液(pH 8.0)、0.5 mol/L氯化钠和10 mmol/L咪唑的平衡液进行平衡,在上清液全部过柱后,使用与平衡液相同浓度的缓冲液洗涤层析柱。目标蛋白分别使用含0.2 mol/L咪唑和0.3 mol/L咪唑的缓冲液洗脱。洗脱后的蛋白装入透析袋中,依次使用含0.50、0.35、0.15 mol/L NaCl的磷酸盐缓冲液(100 mmol/L Na2HPO4、10%甘油)进行梯度透析以降低蛋白液的盐浓度,最后经0.22 µm滤器过滤灭菌后分装,置于-80 ℃冰箱保存,用于后续实验。
使用鼠伤寒沙门氏菌和大肠埃希氏菌O157:H7检测重组蛋白cNKL9和cNKL15的抑菌活性。将鼠伤寒沙门氏菌或大肠埃希氏菌O157:H7保存菌株接种于LB无抗液体培养基中,置于37 ℃恒温培养箱中200 r/min培养12 h;第2天以1%接种量转接于50 mL LB无抗液体培养基中,37 ℃、200 r/min培养约2 h至OD600值达0.5。将培养好的菌液用磷酸盐缓冲液(20 mmol/L Na2HPO4, pH 7.4)稀释3 000倍,使菌液浓度约为3×105 CFU/mL;cNKL9和cNKL15蛋白用磷酸盐缓冲液分别稀释至0.2、1、5 μmol/L。随后将25 μL菌液分别与25 μL不同浓度的蛋白混合,同时设置25 μL菌液与25 μL磷酸盐缓冲液为阴性对照组,25 μL菌液与25 μL 50 mg/mL卡那霉素为阳性对照组(每次试验均设3个平行组)。将所有组别置于37 ℃恒温培养箱中静置作用3 h后,用预冷的磷酸盐缓冲液将反应物稀释100倍,取100 μL涂布于LB无抗固体培养基上,置于恒温培养箱中培养。菌落于固体培养基上生长约14 h可见明显清晰单菌落后,对每个培养板上的单菌落进行计数统计。统计分析结果以均值±标准差表示,所有实验均重复3次以上。
使用HD11鸡巨噬细胞检测重组蛋白cNKL9和cNKL15的免疫调节活性。将10 cm培养皿中状态良好的细胞以1:3的比例接种于12孔细胞培养板中,置于37 ℃恒温培养箱(5% CO2)中培养16 h后,用PBS缓冲液洗涤细胞,加入用完全培养基稀释的100、1 000、4 000 nmol/L浓度的cNKL9和cNKL15蛋白,同时设置仅含完全培养基的对照组为阴性对照。在37 ℃恒温培养箱(5% CO2)中作用细胞6 h后收集细胞样品,分别使用RNA提取试剂盒(南京诺唯赞生物科技股份有限公司)、cDNA合成试剂盒(北京全式金生物技术有限公司)、荧光定量PCR试剂(北京全式金生物技术有限公司)进行RNA提取、反转录及RT-qPCR,检测HD11细胞中细胞因子CCL4、CCL20、IL-1β、IL-8的mRNA表达水平(RT-qPCR所用引物见表3)。统计分析结果以均值±标准差表示,所有实验均重复3次以上。
选取表达良好的菌株接种于50 mL YPD培养基中,30 ℃、200 r/min培养24 h后,将菌液转接至600 mL YPD培养基中继续培养12 h。当OD600值达到5.0-6.0时将细胞培养物接种至含7.5 L基础盐培养基并添加PTM1溶液的15 L发酵罐中。初始条件设定为:振荡速度600 r/min,温度30 ℃,通过添加28%氨水维持pH 5.0,溶解氧控制在20%-40%。当甘油耗尽导致溶解氧(dissolved oxygen, DO)快速上升时开始添加含50%甘油和PTM1溶液的补料培养基。以18 mL/(L·h)的甘油补料速率持续6 h,直至培养物湿重达到约200 g/L。随后停止甘油补料,改用甲醇诱导蛋白质表达。同时通过循环冷却水将温度调节至25 ℃或30 ℃,将pH值调整至5.0或6.0,并通过调节转速将溶解氧控制在20%-40%[24]
为在毕赤酵母表达系统重组表达cNKL9和cNKL15蛋白,本研究构建了重组表达质粒pPIC9K-cNKL9和pPIC9K-cNKL15,其质粒图谱见图1A。首先以cNKL15基因(包含cNKL9基因序列)为模板,通过相应的PCR引物分别扩增得到目的基因片段,其大小分别为268 bp和403 bp,与预期一致(图1B)。随后将目的基因片段与pPIC9K载体进行同源重组转化,对重组质粒进行测序验证及PCR扩增鉴定。结果显示,重组质粒测序结果正确,PCR扩增片段大小与预期相符,表明重组质粒构建成功(图1C)。
将构建的cNKL9cNKL15重组质粒分别转化至毕赤酵母宿主菌株GS115,经甲醇诱导表达后,收集培养上清液并进行SDS-PAGE检测。结果显示,转化cNKL9重组质粒的菌株培养上清液中可检测到约9 kDa的蛋白条带,转化cNKL15重组质粒的菌株培养上清液中可检测到约15 kDa的蛋白条带(图2A)。cNKL9和cNKL15蛋白条带的分子量均略高于理论值,推测为目标蛋白发生了糖基化修饰所致[22]。此外,在cNKL15蛋白对应15 kDa条带下方还检测到一条条带,推测为cNKL15蛋白部分降解所致(图2A)。采用抗His标签抗体对培养上清进行Western blotting验证,结果显示,在与cNKL9和cNKL15目的蛋白分子量对应的位置均检测到特异性His标签条带(图2B),进一步证实cNKL9和cNKL15蛋白在毕赤酵母中实现了重组表达。
随后分别对表达cNKL9和cNKL15重组蛋白的培养上清进行镍离子亲和层析纯化。SDS-PAGE检测结果显示,纯化后的cNKL9重组蛋白在约9 kDa处呈现单一条带,纯化后的cNKL15重组蛋白在约15 kDa处呈现一条主带,主带下方虽仍可见一条降解条带,但强度较弱,蛋白纯度满足后续功能实验要求(图2C)。
采用平板活菌计数法检测2种重组蛋白的抑菌活性,选取鼠伤寒沙门氏菌和大肠埃希氏菌O157:H7这2种常见的高耐药性革兰氏阴性病原菌作为检测对象。结果显示,重组cNKL9蛋白在浓度低于1 μmol/L时即呈剂量依赖性抑制菌落生长,在1 μmol/L和5 μmol/L下均能完全抑制2种病原菌的生长(图3A)。重组cNKL15蛋白即使在5 μmol/L的高浓度下,也未表现出明显的抑菌活性(图3A)。
为检测重组蛋白的免疫调节活性,采用RT-qPCR技术检测不同浓度cNKL9和cNKL15重组蛋白刺激鸡源巨噬细胞HD11后多种细胞因子mRNA表达水平的变化。结果显示,cNKL15重组蛋白呈剂量依赖性显著上调细胞因子CCL4、CCL20、IL-8及IL-1β的mRNA表达水平。在5 μmol/L浓度处理下,上述细胞因子的mRNA表达量较未处理对照组分别上升约80、330、540、570倍,表明cNKL15具有较强的免疫调节能力(图3B)。cNKL9重组蛋白未能上调上述细胞因子的转录水平,未表现出对HD11细胞的免疫调节活性(图3B)。上述结果表明,重组蛋白cNKL9和cNKL15表现出明显不同的生物活性。
为获得更高表达水平的cNKL9和cNKL15重组蛋白,本研究采用15 L发酵罐对毕赤酵母重组表达菌株进行高密度发酵培养。经对发酵条件的系统优化,最终确定甲醇诱导阶段的最佳参数为:温度25 ℃、pH 5.0。在最佳发酵条件下,毕赤酵母重组菌株可持续增殖,表达cNKL9重组蛋白的菌株湿重在72 h后达到287 g/L,表达cNKL15重组蛋白的菌株湿重在72 h后达到256 g/L (图4A)。与此同时,2株重组菌株发酵上清液中的粗蛋白含量自甲醇诱导后开始逐步积累,其中cNKL9重组菌株上清液中的粗蛋白含量从24 h的0.43 g/L增至48 h的0.64 g/L,72 h后降至0.25 g/L;cNKL15重组菌株的粗蛋白含量从24 h的0.40 g/L增至48 h的0.53 g/L,72 h后降至0.26 g/L (图4B)。SDS-PAGE检测显示,发酵上清液中的cNKL9和cNKL15重组蛋白在甲醇诱导后0-48 h内持续积累,而在48-72 h期间,目的蛋白出现明显降解,与粗蛋白含量变化趋势一致(图4C)。上述结果表明,在高密度发酵条件下,cNKL9和cNKL15重组蛋白在甲醇诱导约48 h时表达量达到最高水平。
鸡源NK-lysin与颗粒溶素均属于SAPLIP蛋白家族成员,二者氨基酸序列相似性较高(64%),三维结构非常类似,均具有由3个loop环连接成5个α-螺旋束的特征结构[5,9,25]。目前关于颗粒溶素的功能研究较为深入,其9 kDa蛋白和15 kDa蛋白的功能差异也已明确。颗粒溶素15 kDa蛋白在抗原刺激2-5 d内可快速诱导表达,且随着9 kDa蛋白的逐步生成,15 kDa蛋白的表达水平逐渐下降并趋于稳定[26]。稳定表达的15 kDa蛋白主要定位于胞浆或分泌至胞外,而成熟型9 kDa蛋白是15 kDa蛋白经酶切加工形成的产物,与穿孔素及颗粒酶共同存在于细胞毒性颗粒中,在接受信号刺激后通过胞吐作用释放至靶细胞内,不仅具有广谱抗细菌、真菌及寄生虫活性,还可诱导多种肿瘤细胞凋亡[27-29]。长期以来,关于颗粒溶素的研究均集中于9 kDa蛋白,而对15 kDa蛋白的关注较少,此前普遍认为该蛋白仅作为9 kDa蛋白的前体发挥作用。直至2008年,多项研究相继证实,15 kDa蛋白同样具有重要的免疫调节功能[30-33]。尽管鸡源NK-lysin与颗粒溶素的三维结构高度相似,但针对鸡源NK-lysin的相关研究却十分有限。因此,对鸡源NK-lysin的9 kDa和15 kDa蛋白进行外源重组表达,并深入探究二者的功能差异,具有重要的研究价值。
目前对于鸡NK-lysin蛋白的异源重组表达主要集中于利用COS7细胞系统表达cNKL15蛋白,尚未见cNKL9重组表达的相关报道[14-15]。然而,在COS7细胞中重组表达cNKL15蛋白存在表达量低的问题,仅能通过Western blotting检测到微量表达条带[15]。本研究首次实现了cNKL9的异源重组表达,同时利用毕赤酵母系统成功分泌表达了cNKL9和cNKL15蛋白,并通过优化发酵条件实现了2种蛋白的高效表达,表达量分别达到约0.64 g/L和0.53 g/L。此外,由于重组蛋白成功分泌至发酵上清,后续纯化步骤十分便捷,该表达体系的建立为cNKL9和cNKL15重组蛋白的后续应用研究奠定了良好基础。同时,在15 L发酵罐中进行放大发酵时发现,cNKL9和cNKL15重组蛋白在发酵72 h时表达量均出现下降,尤其是cNKL15蛋白在发酵48 h时即出现降解现象。其原因可能是发酵上清中积累的蛋白酶对目的蛋白产生了降解作用,后续仍需进一步优化发酵工艺条件,或采用蛋白酶缺陷型宿主菌株进行发酵。
本研究通过对cNKL9cNKL15的基因序列进行毕赤酵母偏好性密码子优化,成功实现了cNKL9和cNKL15蛋白在毕赤酵母中的重组分泌表达。获得的重组cNKL9蛋白对鼠伤寒沙门氏菌等革兰氏阴性菌具有显著抗菌活性,但未能上调HD11细胞中CCL20等细胞因子的转录表达水平;重组cNKL15蛋白则恰好相反,对革兰氏阴性菌未表现出明显抗菌活性,但可显著上调HD11细胞中CCL20等细胞因子的转录表达水平,展现出与哺乳动物细胞表达体系产物一致的功能活性[14-15]。上述结果表明,cNKL9和cNKL15蛋白在机体免疫系统中可能承担不同的功能。此外,cNKL9和cNKL15蛋白均可通过高密度发酵实现高水平表达,在优化条件下表达量分别达到约0.64 g/L和0.53 g/L。因此,在未来研究中可进一步挖掘cNKL9和cNKL15蛋白的潜在功能,二者有望开发为新型抗生素替代产品或免疫调节产品,应用于畜禽养殖领域,对提高动物抗病能力、改善畜禽生长性能、推动绿色健康养殖发展具有重要的应用前景。
  • 国家重点研发计划(2022YFD1300701)
  • 国家自然科学基金(32372915)
  • 现代农业产业技术体系项目(CARS-41)
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doi: 10.13343/j.cnki.wsxb.20250819
  • 接收时间:2025-10-31
  • 首发时间:2026-07-06
  • 出版时间:2026-07-04
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  • 收稿日期:2025-10-31
  • 录用日期:2026-02-13
基金
The National Key Research and Development Program of China(2022YFD1300701)
国家重点研发计划(2022YFD1300701)
The National Natural Science Foundation of China(32372915)
国家自然科学基金(32372915)
The China Agriculture Research System(CARS-41)
现代农业产业技术体系项目(CARS-41)
作者信息
    中国农业科学院北京畜牧兽医研究所,畜禽营养与饲养全国重点实验室,北京

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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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