Article(id=1241377722950283872, tenantId=1146029695717560320, journalId=1192105938417971205, issueId=1241377719049572379, articleNumber=null, orderNo=null, doi=10.13343/j.cnki.wsxb.20230652, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1698076800000, receivedDateStr=2023-10-24, revisedDate=null, revisedDateStr=null, acceptedDate=1710172800000, acceptedDateStr=2024-03-12, onlineDate=1773897112833, onlineDateStr=2026-03-19, pubDate=1717430400000, pubDateStr=2024-06-04, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1773897112833, onlineIssueDateStr=2026-03-19, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1773897112833, creator=13701087609, updateTime=1773897112833, updator=13701087609, issue=Issue{id=1241377719049572379, tenantId=1146029695717560320, journalId=1192105938417971205, year='2024', volume='64', issue='6', pageStart='1691', pageEnd='2143', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=0, createTime=1773897111904, creator=13701087609, updateTime=1773897665313, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1241380040286458828, tenantId=1146029695717560320, journalId=1192105938417971205, issueId=1241377719049572379, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1241380040286458829, tenantId=1146029695717560320, journalId=1192105938417971205, issueId=1241377719049572379, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=1936, endPage=1947, ext={EN=ArticleExt(id=1241377723290022499, articleId=1241377722950283872, tenantId=1146029695717560320, journalId=1192105938417971205, language=EN, title=Petroleum-degrading enzymes: screening and performance improvement by immobilization and surfactants, columnId=1241377722715394129, journalTitle=Acta Microbiologica Sinica, columnName=Geomicrobiological Applications, runingTitle=null, highlight=null, articleAbstract=

The oily sludge produced in petroleum exploitation and processing is the main pollution source in the petrochemical industry, causing continuous harm to the surrounding eco-environment. Bioremediation as an effective and sustainable technology has attracted much attention. However, the current studies focus on the microbial degradation of petroleum in oily sludge and rarely report enzymatic degradation. [Objective] This study aims to screen petroleum-degradation enzymes by computer simulation and experimental techniques and improve the degradation effect by adding surfactants and enzyme immobilization. [Methods] Molecular docking was employed to analyze the possibility and mode of binding of target enzymes to common substrates in petroleum and the strongest degrading enzyme was screened out by enzymatic degradation experiments. Furthermore, the degradation conditions of the enzyme screened out were optimized, and the degradation effect on petroleum was further improved by immobilization and addition of surfactants. [Results] A total of five petroleum-degrading enzymes were obtained by molecular docking simulation and experimental verification. Among them,Bacillussubtilis laccase (BsLac) exhibited the highest degradation rate of petroleum, which reached 34.1% at the time point of 72 h. Surfactants improved the degradation of BsLac on petroleum, and sophorolipid showcased the strongest promoting effect, with the highest degradation rate of 46.3% at the sophorolipid concentration of 1 000 mg/L. However, 2,2′-azinoo-bis(3-ethyl-benzothiazoline-6-sulfonic acid) diammonium salt (ABTS) did not present promoting effect on BsLac for petroleum degradation. The BsLac immobilized by peanut shell as the adsorption carrier exhibited the highest petroleum degradation rate (56.3%). [Conclusion] We screened out the strongest petroleum-degrading enzyme by molecular docking and experimental verification. Furthermore, the immobilization of BsLac can improve the degradation performance on petroleum. The findings lay an experimental and theoretical foundation for further exploring the enzymatic degradation of petroleum.

, correspAuthors=Jing WU, Zhengfei YAN, authorNote=null, correspAuthorsNote=
*E-mail: WU Jing,;
E-mail: YAN Zhengfei,
, copyrightStatement=Copyright ©2024 Acta Microbiologica Sinica. All rights reserved., 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, authorCompany=null, fund=null, authors=null, authorsList=Jing YANG, Qingsong HUANG, Congyu YAO, Meng SHI, Lei GU, Kewei XU, Jing WU, Zhengfei YAN), CN=ArticleExt(id=1241377727014564521, articleId=1241377722950283872, tenantId=1146029695717560320, journalId=1192105938417971205, language=CN, title=石油降解酶的筛选、固定化及添加表面活性剂强化其对石油的降解, columnId=1241377722941886549, journalTitle=微生物学报, columnName=地质微生物应用, runingTitle=null, highlight=null, articleAbstract=

在石油开采和加工过程中产生的含油污泥是石油化工行业中主要的污染源,会对周边生态环境造成持续性的危害。生物法降解被认为是一种有效且可持续的技术而备受关注。目前的研究多聚焦在微生物法降解石油,而酶法降解鲜有报道。【目的】本研究旨在优选石油高效降解酶,并深入分析其降解特性,以期构建一套酶法降解石油的体系。【方法】基于分子对接模拟技术,分析酶与石油类常见底物的结合可能性及结合模式,通过石油降解实验优选降解酶;通过添加表面活性剂及酶固定化进一步提高酶对石油的降解效果。【结果】利用分子对接模拟及实验验证获得5种具有石油降解能力的生物酶,其中枯草芽孢杆菌(Bacillussubtilis)来源的漆酶BsLac对石油的降解率最高,72 h可降解34.1%的石油;进一步研究发现,表面活性剂的添加均可促进BsLac对石油的降解,其中槐糖脂的促进作用尤为显著。当槐糖脂终浓度为1 000 mg/L时,石油的降解率最高,为46.3%;然而,2,2′-联氮-双(3-乙基苯并噻唑啉-6-磺酸)二铵盐的添加对BsLac降解石油的促进作用并不明显;固定化结果表明,以花生壳为吸附载体固定化的BsLac对石油的降解率最高,为56.3%。【结论】本研究基于分子对接模拟和实验筛选获得了石油降解酶BsLac,固定化的BsLac可实现石油的高效降解,为生物酶法降解石油的进一步探索奠定了实验和理论基础。

, correspAuthors=吴敬, 颜正飞, authorNote=null, correspAuthorsNote=null, copyrightStatement=版权所有©《微生物学报》编辑部2024, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=f3O+ng0GREy4T3jyBFb5/A==, magXml=rkF1jW1l1+glKVzqvt6P1Q==, pdfUrl=null, pdf=X/NiC1c/3BJZw8mjLwf5gw==, pdfFileSize=988965, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=s43+nFpV2oX9IGg6jKfBRw==, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=SQU2IkyBKQw48OV5etjMpA==, mapNumber=null, authorCompany=null, fund=null, authors=null, authorsList=杨静, 黄青松, 姚从禹, 时梦, 顾磊, 许科伟, 吴敬, 颜正飞)}, authors=[Author(id=1241445028732662059, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241377722950283872, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=null, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1241445028862685493, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241377722950283872, authorId=1241445028732662059, language=EN, stringName=Jing YANG, firstName=Jing, middleName=null, lastName=YANG, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=1, 2, 3, address=1 School of Biotechnology, Jiangnan University, Wuxi 214122, Jiangsu, China
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2 State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi 214122, Jiangsu, China
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2 State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi 214122, Jiangsu, China
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A: Immobilization effect of BsLac on petroleum degradation. B: Degradation effect of adsorbed bound immobilized BsLac on petroleum at different concentrations., figureFileSmall=zukHIv7RU+RrCgP06g7e8A==, figureFileBig=ZtSFWzVSbWeRsQxOKq5YTQ==, tableContent=null), ArticleFig(id=1241445038379561689, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241377722950283872, language=CN, label=图5, caption=固定化对BsLac降解石油的影响, figureFileSmall=zukHIv7RU+RrCgP06g7e8A==, figureFileBig=ZtSFWzVSbWeRsQxOKq5YTQ==, tableContent=null), ArticleFig(id=1241445038698328798, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241377722950283872, language=EN, label=Table 1, caption=

Binding energy (kcal/mol) between target enzymes and substrates

, figureFileSmall=null, figureFileBig=null, tableContent=
SubstratesBsLacEsP450SsLcpAsDyPsMrUPO
2-methylnaphthalene−4.02−6.78−7.76−5.33−6.23
1,2,4-trimethylbenzen−3.51−5.83−6.86−4.52−5.36
n-hexadecane−1.68−5.14−5.51−3.05−2.69
), ArticleFig(id=1241445038895461095, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241377722950283872, language=CN, label=表1, caption=

目标酶与底物的结合自由能

, figureFileSmall=null, figureFileBig=null, tableContent=
SubstratesBsLacEsP450SsLcpAsDyPsMrUPO
2-methylnaphthalene−4.02−6.78−7.76−5.33−6.23
1,2,4-trimethylbenzen−3.51−5.83−6.86−4.52−5.36
n-hexadecane−1.68−5.14−5.51−3.05−2.69
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石油降解酶的筛选、固定化及添加表面活性剂强化其对石油的降解
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杨静 1, 2, 3 , 黄青松 1, 2, 3 , 姚从禹 1, 2, 3 , 时梦 1, 2, 3 , 顾磊 4 , 许科伟 4 , 吴敬 1, 2, 3, * , 颜正飞 1, 2, 3, *
微生物学报 | 地质微生物应用 2024,64(6): 1936-1947
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微生物学报 | 地质微生物应用 2024, 64(6): 1936-1947
石油降解酶的筛选、固定化及添加表面活性剂强化其对石油的降解
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杨静1, 2, 3, 黄青松1, 2, 3, 姚从禹1, 2, 3, 时梦1, 2, 3, 顾磊4, 许科伟4, 吴敬1, 2, 3, * , 颜正飞1, 2, 3, *
作者信息
  • 1 江南大学生物工程学院, 江苏 无锡 214122
  • 2 江南大学 食品科学与资源挖掘全国重点实验室, 江苏 无锡 214122
  • 3 江南大学 教育部食品安全国际合作联合实验室, 江苏 无锡 214122
  • 4 中国石化石油勘探开发研究院无锡石油地质研究所, 江苏 无锡 214126
Petroleum-degrading enzymes: screening and performance improvement by immobilization and surfactants
Jing YANG1, 2, 3, Qingsong HUANG1, 2, 3, Congyu YAO1, 2, 3, Meng SHI1, 2, 3, Lei GU4, Kewei XU4, Jing WU1, 2, 3, * , Zhengfei YAN1, 2, 3, *
Affiliations
  • 1 School of Biotechnology, Jiangnan University, Wuxi 214122, Jiangsu, China
  • 2 State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi 214122, Jiangsu, China
  • 3 International Joint Laboratory on Food Safety, Ministry of Education, Jiangnan University, Wuxi 214122, Jiangsu, China
  • 4 Wuxi Research Institue of Petroleum Geology, Sinopec Petroleum Exploration and Production Research Institute, Wuxi 214126, Jiangsu, China
出版时间: 2024-06-04 doi: 10.13343/j.cnki.wsxb.20230652
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在石油开采和加工过程中产生的含油污泥是石油化工行业中主要的污染源,会对周边生态环境造成持续性的危害。生物法降解被认为是一种有效且可持续的技术而备受关注。目前的研究多聚焦在微生物法降解石油,而酶法降解鲜有报道。【目的】本研究旨在优选石油高效降解酶,并深入分析其降解特性,以期构建一套酶法降解石油的体系。【方法】基于分子对接模拟技术,分析酶与石油类常见底物的结合可能性及结合模式,通过石油降解实验优选降解酶;通过添加表面活性剂及酶固定化进一步提高酶对石油的降解效果。【结果】利用分子对接模拟及实验验证获得5种具有石油降解能力的生物酶,其中枯草芽孢杆菌(Bacillussubtilis)来源的漆酶BsLac对石油的降解率最高,72 h可降解34.1%的石油;进一步研究发现,表面活性剂的添加均可促进BsLac对石油的降解,其中槐糖脂的促进作用尤为显著。当槐糖脂终浓度为1 000 mg/L时,石油的降解率最高,为46.3%;然而,2,2′-联氮-双(3-乙基苯并噻唑啉-6-磺酸)二铵盐的添加对BsLac降解石油的促进作用并不明显;固定化结果表明,以花生壳为吸附载体固定化的BsLac对石油的降解率最高,为56.3%。【结论】本研究基于分子对接模拟和实验筛选获得了石油降解酶BsLac,固定化的BsLac可实现石油的高效降解,为生物酶法降解石油的进一步探索奠定了实验和理论基础。

石油降解酶  /  表面活性剂  /  固定化  /  漆酶

The oily sludge produced in petroleum exploitation and processing is the main pollution source in the petrochemical industry, causing continuous harm to the surrounding eco-environment. Bioremediation as an effective and sustainable technology has attracted much attention. However, the current studies focus on the microbial degradation of petroleum in oily sludge and rarely report enzymatic degradation. [Objective] This study aims to screen petroleum-degradation enzymes by computer simulation and experimental techniques and improve the degradation effect by adding surfactants and enzyme immobilization. [Methods] Molecular docking was employed to analyze the possibility and mode of binding of target enzymes to common substrates in petroleum and the strongest degrading enzyme was screened out by enzymatic degradation experiments. Furthermore, the degradation conditions of the enzyme screened out were optimized, and the degradation effect on petroleum was further improved by immobilization and addition of surfactants. [Results] A total of five petroleum-degrading enzymes were obtained by molecular docking simulation and experimental verification. Among them,Bacillussubtilis laccase (BsLac) exhibited the highest degradation rate of petroleum, which reached 34.1% at the time point of 72 h. Surfactants improved the degradation of BsLac on petroleum, and sophorolipid showcased the strongest promoting effect, with the highest degradation rate of 46.3% at the sophorolipid concentration of 1 000 mg/L. However, 2,2′-azinoo-bis(3-ethyl-benzothiazoline-6-sulfonic acid) diammonium salt (ABTS) did not present promoting effect on BsLac for petroleum degradation. The BsLac immobilized by peanut shell as the adsorption carrier exhibited the highest petroleum degradation rate (56.3%). [Conclusion] We screened out the strongest petroleum-degrading enzyme by molecular docking and experimental verification. Furthermore, the immobilization of BsLac can improve the degradation performance on petroleum. The findings lay an experimental and theoretical foundation for further exploring the enzymatic degradation of petroleum.

petroleum-degrading enzyme  /  surfactant  /  immobilization  /  laccase
杨静, 黄青松, 姚从禹, 时梦, 顾磊, 许科伟, 吴敬, 颜正飞. 石油降解酶的筛选、固定化及添加表面活性剂强化其对石油的降解. 微生物学报, 2024 , 64 (6) : 1936 -1947 . DOI: 10.13343/j.cnki.wsxb.20230652
Jing YANG, Qingsong HUANG, Congyu YAO, Meng SHI, Lei GU, Kewei XU, Jing WU, Zhengfei YAN. Petroleum-degrading enzymes: screening and performance improvement by immobilization and surfactants[J]. Acta Microbiologica Sinica, 2024 , 64 (6) : 1936 -1947 . DOI: 10.13343/j.cnki.wsxb.20230652
石油作为“工业的血液”已广泛应用于人类社会[1],然而其在开采、运输、加工等过程中不可避免地会产生泄漏,对生态环境造成持续的危害。因此,石油污染是石油工业可持续发展中最为紧迫的问题之一[2]。目前,物理法(焚烧、填埋等)和化学法(溶剂萃取、化学氧化等)修复石油污染技术相对成熟,但其缺乏有效的生态友好处理工艺,存在成本高、易造成二次污染、修复不彻底等缺点[3-4]。生物法被认为是最具前景且绿色可持续的修复技术,已被广泛研究[5-6]
生物法处理石油污染多聚焦于微生物法,多种微生物均被证实具有石油降解能力[7],如假单胞菌属(Pseudomonas)、红球菌属(Rhodococcus)、枯草芽孢杆菌属(Bacillus)等,并从中鉴定出一系列石油降解酶,如加氧酶、过氧化物酶、漆酶、细胞色素酶P450等[8]。生物酶多作为补充剂来加速微生物降解石油进程,如在枯草芽孢杆菌(Bacillussubtilis)来源漆酶参与下,由短芽孢杆菌(Brevibacillus sp.)、芽孢杆菌(Bacillus sp.)和申氏不动杆菌(Acinetobacterschindleri)组成的菌群对石油的降解速率常数由每天0.112提升至每天0.198[9]。现阶段,仅以生物酶降解石油的研究还处于起步阶段,相关报道相对较少。然而,生物酶对石油衍生物(塑料与蒽醌)的降解研究已有详细论述,如漆酶可降解经紫外线预处理的聚乙烯塑料,重均分子量降低约40%[10];过氧化物酶可在108 h内降解90%的蒽醌物质[11]。相对于微生物具有未知的环境安全问题,生物酶则不会对环境产生显著影响,是一个环境友好的石油污染修复过程。
在系列降解酶中,漆酶因其高热稳定性和对有机物的高耐受性,在有机污染降解方面具有显著优势[12-13]。漆酶由于氧化还原电位较低(0.4−0.8 V),导致其对芳香族和非酚类等有机污染物的降解效果不理想。因此,可通过添加小分子化合物,如2, 2′联氮-二(3-乙基-苯并噻唑-6-磺酸)二铵盐[2,2′-azinoo-bis(3-ethyl-benzothiazoline-6-sulfonic acid) diammonium salt, ABTS]、紫尿酸(5-hydroxyiminobarbituric acid, VIO)、1-羟基苯并三唑(1-hydroxybenzotriazole, HBT)等,赋予漆酶较高的氧化还原电位来提高其对有机污染物的降解效率[14-15]。如通过添加终浓度为2.0 μmol/L的ABTS,漆酶对羟基化多溴联苯醚的降解率可提高20多倍[16]。进一步研究发现,石油中烷烃的降解需要羟化反应,其通常是整个降解反应的限速步骤[17]。细胞色素酶P450具有烷烃羟化活性,可通过氧化断裂石油烃类中的短链烷烃和中链烷烃(C5−C16),从而达到降解的效果[1,18]。此外,非特异性过氧化物酶[19]、橡胶氧化酶[20]和染料脱色过氧化物酶[21]等氧化酶系在污染物降解领域也具有广泛的应用潜力。
表面活性剂的添加能够促进生物酶法降解有机污染物,一是可提高污染物的溶解性与分散性,大大增加其与酶结合的概率;二是其可与酶互作进而提高酶的催化性能[22]。Bezza等[23]的研究发现,铜绿假单胞菌(Pseudomonasaeruginosa) CB1产生的生物表面活性剂明显提高了本土微生物对多环芳烃的降解效果,降解率达86.5%,显著高于对照组(57.0%);聚乙二醇(polyethylene glycol, PEG)通过提高过氧化物酶(peroxidase)的稳定性来强化其对苯酚类污染物的去除效果[24]。此外,生物酶经固定化处理可显著提高其催化能力[25],固定化材料作为支持结构可维持酶活性中心结构的刚性,有助于酶在更大范围的pH和温度条件下长时间保持催化活性[26]。固定化方法一般分为包埋、物理吸附、共价结合和交联四大类,载体材料因固定化方法的不同而有所差异。如海藻酸钠具有良好的生物兼容性、黏附性和缓释性,常作为生物酶的包埋载体;经海藻酸钙包埋的木质素降解酶与石油污染沉积物混合并堆肥处理70 d,沉积物中的碳氢化合物降解菌的丰度显著提高[27],与游离酶相比,固定化酶能够持续发挥催化作用将样品中微生物难以利用的组分降解成可利用的物质。
综上所述,本研究旨在开展以下工作:(1) 选取枯草芽孢杆菌(Bacillussubtilis)来源漆酶(BsLac) PDB 1gsk、微小杆菌(Exiguobacterium sp.) AT1b来源细胞色素酶(EsP450) PDB 5yhj、辐射小应伞(Marasmiusrotula)来源非特异性过氧化物酶(MrUPO) PDB 5fuj、鱼腥藻(Anabaena sp.) PCC 7120来源染料脱色过氧化物酶(AsDyPs) PDB 5c2I和链霉菌(Streptomyces sp.) K30来源橡胶氧化酶(SsLcp) PDB 5o1l5种目标酶,将其与石油的典型成分(2-甲基萘[28]、偏三甲苯[29]、正十六烷[30])进行分子对接模拟分析其降解石油的潜力;(2) 将目标酶在相应的表达宿主中异源表达,并结合降解实验筛选最优石油降解酶;(3) 探究降解体系中表面活性剂与ABTS的添加,以及固定化酶对石油降解的影响。本研究为生物酶法处理石油污染提供理论基础与技术支持。
石油样品由中国石化石油勘探开发研究院无锡石油地质研究所惠赠。其中,饱和烃含量为81.38%,芳香烃含量为9.19%,胶质含量为5.63%,沥青含量为3.80%。漆酶BsLac、细胞色素酶EsP450、非特异性过氧化物酶MrUPO、染料脱色过氧化物酶AsDyPs和橡胶氧化酶SsLcp的编码基因均由苏州金唯智生物科技有限公司合成。槐糖脂购自山东优索化工科技有限公司;鼠李糖脂购自西安安瑞科生物科技有限公司;吐温80、Triton X-100及其他常用试剂均购自国药集团化学试剂有限公司。
LB培养基[20]用于大肠杆菌(Escherichiacoli) BL21(DE3)的活化、感受态制备及种子液培养。TB培养基用于E.coli BL21(DE3)的发酵培养。YPD、BMMY、BMGY培养基[31]用于毕赤酵母(Pichiapastoris) GS115的活化、感受态制备、种子液培养及发酵培养。
从PubChem数据库(https://pubchem.ncbi.nlm.nih.gov/)获取石油中典型成分的结构式(2-甲基萘、偏三甲苯、正十六烷)。BsLac (PDB 1gsk)、EsP450 (PDB 5yhj)、SsLcp (PDB 5o1l)、AsDyPs (PDB 5c2I)、MrUPO (PDB 5fuj)等蛋白质晶体结构来自PDB数据库(https://www.rcsb.org/)。采用Autodock 4.2软件进行分子对接[22],并利用PILP网站(https://plip-tool.biotec.tu-dresden.de/plip-web/plip/index)分析疏水作用力,随后用PyMOL软件显示酶和底物的结合位置和方向。
根据酶的来源微生物的不同,将含有BsLac、AsDyPs、SsLcp和EsP450编码基因的重组质粒(pET20b-BsLac、pET20b-AsDyPs、pET20b-SsLcp和pET20b-EsP450)利用化学转化法[20]转入E.coli BL21(DE3)进行异源表达;将含有MrUPO编码基因的重组质粒(pPIC9K-MrUPO)利用电穿孔法[31]转入P.pastoris GS115进行异源表达。E.coli BL21(DE3)和P.pastoris GS115重组菌发酵产酶及后续酶液的获得与定量按Shi等[20]和袁帅等[31]所述方法进行。
将3 mg目的蛋白添加至50 mL pH 7.0 50 mmol/L含0.5% (质量体积分数)石油的磷酸盐缓冲液中,在30 ℃、180 r/min条件下反应72 h。每隔24 h补加1 mg目的蛋白,共补加2次。以未添加酶液为空白对照组,每组设置3个平行。除BsLac外,其他酶(EsP450、MrUPO、AsDyPs和SsLcp)需在H2O2的参与下才表现出催化活性,因此在其降解过程中,每隔24 h补加一次H2O2,使其终浓度维持在1 mmol/L。反应结束后,采用重量法测定石油降解率。
在1.5小节所述降解体系中分别添加终浓度为100、200、500、1 000、1 200 mg/L的表面活性剂吐温80、Triton X-100、鼠李糖脂和槐糖脂。相同的反应条件下,测定石油的降解率以评估表面活性剂对酶降解石油的影响。
BsLac的活性测定采用ABTS法。将终浓度为100、200、500、1 000、1 200 mg/L的槐糖脂与BsLac酶液置于30 ℃水浴锅中孵育2 h,以不添加槐糖脂的酶液为对照组,测定其与ABTS反应后在420 nm波长处1 min内吸光值的变化。具体反应体系:930 μL柠檬酸缓冲液(50 mmol/L, pH 3.0),20 μL ABTS (10 mmol/L)溶液及50 μL待测酶液。其中每mL溶液每分钟催化氧化1 μmol ABTS所需要的酶量为1个酶活单位(U/mL)[10]。酶活计算如公式(1)所示。
式中,V1为反应总体积,V2为酶液体积,ε为ABTS摩尔消光系数[36 000 L/(mol·cm)],d为比色皿光径(0.5 cm),T为反应时间。
在1.5节所述降解体系中分别添加终浓度为0.05、0.10、0.20、0.50、1.00、2.00 mmol/L的ABTS。相同的反应条件下,测定石油的降解率以评估ABTS对酶降解石油的影响。
对BsLac分别进行吸附、吸附-交联、包埋[32]固定化处理。具体流程如下:以天然且廉价易获得的花生壳为吸附材料,将1 g花生壳粉末与40 mL酶液混合,置于25 ℃、150 r/min条件下孵育6 h。过滤取沉淀并用50 mmol/L磷酸盐缓冲液(pH 6.0)洗涤2次,于室温下干燥,即获得吸附型固定化酶。将1 g花生壳与40 mL酶液置于终浓度为2% (体积分数)的戊二醛溶液中,25 ℃、150 r/min条件下处理6 h。过滤取沉淀并用50 mmol/L磷酸盐缓冲液(pH 6.0)洗涤2次,于室温下干燥,即获得吸附-交联型固定化酶。将质量体积分数2%的海藻酸钠溶液与酶液按1:2的体积比混合,滴入质量体积分数3% 的CaCl2溶液中,在4 ℃条件下硬化2 h。过滤后取颗粒并用去离子水洗涤3次,即获得包埋型固定化酶,将其保存在50 mmol/L磷酸盐缓冲液(pH 6.0)中备用。
采用重量法[33]测定石油降解率。具体流程如下:将反应完的降解液转移至分液漏斗中,以等体积的石油醚为萃取剂进行振荡萃取,待静置分层后,取上层萃取液(石油醚层),经无水Na2SO4去除水分。萃取液转移至硅酸镁柱中净化,用已恒重的称量瓶承接滤液。将滤液置于通风橱挥发后称重。石油降解率计算如公式(2)所示。
式中,m0为对照组石油质量;mt为实验组石油质量。
目标酶与小分子底物的对接结果如图1所示,其中黄色棒状结构为正十六烷,绿色棒状结构为2-甲基萘,橙色棒状结构为偏三甲苯,玫红色棒状结构为催化残基。目标酶活性区域内氨基酸残基均能够与2-甲基萘、偏三甲苯、正十六烷等石油典型成分相结合,如BsLac的T1型铜离子(T1Cu2+,蓝色小球)周围活性残基通过疏水作用力与底物结合在氧化中心(mononuclear centre, MNC)内。同样地,EsP450、SsLcp、AsDyPs也通过疏水作用力与底物连接。酶与底物的结合能越小,越有利于酶与底物的结合,越容易降解污染物[34]。如表1所示,目标酶与2-甲基萘的结合能最小,约−7.76−−4.02 kcal/mol,其次是偏三甲苯(−6.86−−3.51 kcal/mol)和正十六烷(−5.51−−1.68 kcal/mol)。酶与底物的结合能均为负值,说明结合是自发进行的。此外,底物尺寸越大,越难进入酶活性口袋,不利于酶与底物的结合。因此,酶与底物的结合能随底物尺寸的增大而增大。SsLcp对不同底物的结合能力明显高于其他酶类,为−5.51−−7.76 kcal/mol,其次是EsP450 (−5.14−−6.78 kcal/mol)。上述结果表明所选的目标酶均可以与底物结合,具备降解石油的能力。
将按1.4所述方法获得的酶液调整至总蛋白浓度为1 mg/mL后进行SDS-PAGE分析,结果如图2A所示。各泳道内均有明显的条带,并且与理论蛋白分子量大小一致,表明BsLac、AsDyPs、EsP450、SsLcp和MrUPO均在重组菌中成功异源表达,蛋白浓度分别为0.44、0.63、1.15、0.47和0.24 mg/mL。按1.5所述降解体系进行石油降解实验,结果如图2B所示。BsLac对石油的降解率最高,可达34.1%,其次是EsP450 (27.2%)、MrUPO (14.9%)。其中,SsLcp对石油的降解率仅为5.5%,无显著降解效果。因此,选取BsLac为最优石油降解酶进行后续研究。
石油作为疏水性有机物,其在液体体系中的可溶性是影响BsLac催化作用的限制因素之一,因此考虑加入表面活性剂来提高石油的可溶性。如图3A所示,当添加化学表面活性剂Triton X-100和吐温80时,石油降解率随表面活性剂浓度的增加而增加,当终浓度达到1 000 mg/L时,BsLac对石油降解率最高,分别为43.6%和45.9%,当浓度进一步提高至1 200 mg/L时,石油降解率不再上升。生物表面活性剂鼠李糖脂和槐糖脂对酶降解石油的影响如图3B所示。BsLac对石油的降解效果随鼠李糖脂浓度升高呈先上升再下降的趋势,当终浓度为500 mg/L时,石油降解率最高,为41.6%。槐糖脂在终浓度为1 000 mg/L时,石油降解率最高,为46.3%,当浓度达到1 200 mg/L时,石油降解率显著下降。结果表明,表面活性剂的添加可有效提高石油降解率,其中添加浓度是提高催化效果的关键。随后,探究了槐糖脂对BsLac活性的影响,结果如图3C所示。当槐糖脂添加浓度为1 000 mg/L时,BsLac的相对酶活最高,为107.3%。该结果与酶降解石油实验结果基本保持一致。综合考虑,后续均在添加1 000 mg/L终浓度槐糖脂的降解体系中进行实验。
不同终浓度的ABTS对BsLac降解石油的影响如图4所示。BsLac降解石油的效果随ABTS浓度的增加而提升,当ABTS浓度为0.20 mmol/L时,BsLac对石油的降解率最高,达到52.1%,是对照组(0 mmol/L)的1.12倍。当ABTS浓度进一步增加时,石油降解率则呈现出下降的趋势,表明高浓度ABTS可能会抑制石油降解反应的进行。研究表明ABTS的添加可使漆酶对四环素类抗生素的清除率由原来的17.4%提高到64.4%[35]。然而,本研究中ABTS的添加对BsLac降解石油的影响并不显著,可能是漆酶/ABTS系统的催化能力取决于所使用的底物的类型[36]。与其他有机污染物相比,BsLac的低氧化还原电位不是限制其降解石油的决定性因素。
为进一步提升BsLac降解石油的效率,将其分别进行吸附、吸附-交联和包埋固定化处理。如图5A所示,固定化工艺的差异显著影响BsLac对石油的降解效率。其中,BsLac经包埋固定化后,对石油的降解能力明显下降,降解率仅为32.5%。吸附型固定化BsLac对石油的降解率显著提升,是游离酶的1.22倍,达到56.3%。吸附型固定化BsLac经交联处理后,对石油降解率略有下降,为51.8%。因此,吸附固定化工艺能够显著提升BsLac对石油的降解效果。随后测定了吸附型固定化BsLac对不同浓度石油的降解效率,结果如图5B所示。吸附型固定化BsLac对石油降解率随着石油浓度的增加而降低,当石油浓度达到3%时,石油的降解率仅为9%。这可能是由于:(1) 受BsLac初始浓度的限制;(2) 在高浓度石油条件下,生物酶存在底物抑制效应[37]
石油类污染物是环境中常见的有机污染物,目前研究多集中于利用微生物降解其中的石油[6-7]。然而,许多因素能够影响微生物的降解效率,如微生物在极端环境中的适应力、与环境中土著微生物的竞争力等。此外,有毒副产物的产生及外源微生物的引入对生态环境的影响也不可忽视[38]。生物酶法降解是一种绿色且有价值的替代方案,可有效清除石油污染物中的石油且不会产生二次污染,避免外来或转基因生物释放到环境中。
本研究选取的5种目标酶与石油典型成分(2-甲基萘、偏三甲苯、正十六烷)间的相互结合均通过疏水作用力实现,这一结果表明疏水作用力可能作为主要作用力方式促进了石油的降解。此外,酶与底物的结合能也表明,底物的大小显著影响其与酶活性中心的结合,从而影响底物的降解。上述目标酶均表现出石油的降解能力,其中,BsLac对石油的降解效率最为显著,而与底物结合能最高的SsLcp对石油的降解效果并不显著。这可能是由于分子对接模拟仅是结构互作分析,提供了受体与底物结合的理论依据,并未考虑到酶自身活力、环境pH、底物浓度等实际条件,因而计算机模拟结果无法真实反映酶的实际应用效果。
本研究进一步发现表面活性剂的添加可促进BsLac对石油的降解。其中,1 000 mg/L终浓度的槐糖脂可将石油降解率由34.1%提升至46.3%,但ABTS的添加却对BsLac降解石油无显著促进作用。本研究结果与文献报道[16,35]相矛盾,这表明ABTS对漆酶的作用可能取决于所反应的底物的类型。同时,底物的尺寸、结合方向及结合位点的疏水性也影响着其与酶的结合[36]。固定化酶的催化性能受到固定化材料与工艺的影响[37],其中,经花生壳吸附固定化后,BsLac对石油的降解率达到56.3%,远高于其他固定化工艺。包埋和交联固定化工艺不仅易使酶失活,并且传质受限,由于石油高度疏水,其传质受限现象尤为突出。相对而言,吸附固定化工艺操作简单、成本低,在石油降解酶固定化方面具有明显的优越性与竞争力。
本研究通过计算机模拟和实验筛选联用获得具有高效降解石油的BsLac。随后从表面活性剂、ABTS和固定化工艺角度优化,进一步提高BsLac对石油的降解效率,实现单酶即可高效降解石油的目标,证实酶法降解石油是一种行之有效的策略。本研究为进一步研究石油类污染物的酶法修复提供了实验参考。然而,目前还有许多工作需要进一步完善,如提高酶的催化效率、降低酶的生产成本等。
  • 国家自然科学基金(42307279)
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2024年第64卷第6期
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doi: 10.13343/j.cnki.wsxb.20230652
  • 接收时间:2023-10-24
  • 首发时间:2026-03-19
  • 出版时间:2024-06-04
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  • 收稿日期:2023-10-24
  • 录用日期:2024-03-12
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National Natural Science Foundation of China(42307279)
国家自然科学基金(42307279)
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    1 江南大学生物工程学院, 江苏 无锡 214122
    2 江南大学 食品科学与资源挖掘全国重点实验室, 江苏 无锡 214122
    3 江南大学 教育部食品安全国际合作联合实验室, 江苏 无锡 214122
    4 中国石化石油勘探开发研究院无锡石油地质研究所, 江苏 无锡 214126

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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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