Article(id=1320886476016038223, tenantId=1146029695717560320, journalId=1260987677001138203, issueId=1320882506312826993, articleNumber=null, orderNo=null, doi=10.13386/j.issn1002-0306.2025040365, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1745942400000, receivedDateStr=2025-04-30, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1792853476766, onlineDateStr=2026-10-24, pubDate=1778774400000, pubDateStr=2026-05-15, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1792853476766, onlineIssueDateStr=2026-10-24, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1792853476766, creator=13701087609, updateTime=1792853476766, updator=13701087609, issue=Issue{id=1320882506312826993, tenantId=1146029695717560320, journalId=1260987677001138203, year='2026', volume='47', issue='10', pageStart='1', pageEnd='525', issueExtLink='null', onlineDate='null', pubDate='1778774400000', pubDateStr='2026-05-15', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1792852530314, creator='13701087609', updateTime=1792852530314, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext=null, issueFiles=null, downloadFileDto=null}, startPage=175, endPage=184, ext={EN=ArticleExt(id=1320886476242530640, articleId=1320886476016038223, tenantId=1146029695717560320, journalId=1260987677001138203, language=EN, title=Structural Bioinformatics Analysis of GH42 Family
β-Galactosidases, columnId=1261336275769016441, journalTitle=Science and Technology of Food Industry, columnName=Bioengineering, runingTitle=null, highlight=null, articleAbstract=
Objective: To elucidate the structural basis underlying the diverse extremophilic catalytic properties of β-galactosidases in the GH42 glycoside hydrolase family, enzymes with resolved crystal structures were systematically analyzed to reveal the relationship between structural features and catalytic characteristics. Methods: Correlation analysis between catalytic properties and microbial habitats was performed, combined with amino acid composition, phylogenetic evolution, hydrophobicity distribution, and structural bioinformatics approaches, to investigate the structural determinants responsible for catalytic diversity among GH42 β-galactosidases. Results: GH42 β-galactosidases exhibited a biased amino acid composition characterized by relatively high glutamate (E) content and low lysine (K) content, resulting in generally low isoelectric points (pI). The catalytic properties of these enzymes were adaptively correlated with the growth environments of their host microorganisms. A ''paired'' evolutionary pattern was observed between thermophilic and cold-adapted β-galactosidases within the family. Thermostable enzymes possessed higher internal hydrophobicity, whereas cold-adapted enzymes display stronger surface hydrophilicity. Cold-adapted enzymes exhibited significantly distinct flexible regions at the junction between the TIM-barrel domain and Domain B, as well as at the C-terminus. In contrast, thermostable enzymes enhanced structural rigidity by increasing hydrogen bond numbers and proline (P) content to improve their optimal temperature range. Conclusion: GH42 β-galactosidases shared a conserved molecular scaffold and diverged into cold-adapted and thermostable enzymes via differential internal and surface hydrophobicity. Temperature adaptation of these enzymes arised from the synergistic effects of monomer flexibility, number of hydrogen bonds, and oligomeric state. Based on the evolutionary relationships within the family, this study systematically explored the structural divergence and catalytic differentiation among GH42 enzymes. These findings provide a general reference for further investigations into extremophilic catalysis of GH42 β-galactosidases and the development of engineered enzymes with multi-tolerant properties.
, authors=Mingfei GUO
1, Yuming ZHENG
2, Haiyang GU
1, Lushan WANG
3, Yining DONG
1, *, authorsList=Mingfei GUO, Yuming ZHENG, Haiyang GU, Lushan WANG, Yining DONG, authorCompany=null, correspAuthors=Yining DONG, authorNote=null, correspAuthorsNote=null, copyrightStatement=Copyright © 2026 Science and Technology of Food Industry. 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, fund=null), CN=ArticleExt(id=1320886479572808031, articleId=1320886476016038223, tenantId=1146029695717560320, journalId=1260987677001138203, language=CN, title=GH42家族
β-半乳糖苷酶结构生物信息分析, columnId=1261336277547401341, journalTitle=食品工业科技, columnName=生物工程, runingTitle=null, highlight=null, articleAbstract=
目的:为解析GH42家族(Glycoside hydrolase family 42)β-半乳糖苷酶不同嗜极催化特性差异形成的分子结构原因,本研究以GH42家族已解析晶体结构为研究对象,系统分析其结构特征与催化性质之间的关系。方法:通过酶催化特性与其来源微生物相关性,并结合氨基酸组成、进化、疏水性及结构生物信息分析方法,对具有不同嗜极催化特性GH42家族β-半乳糖苷酶分子结构差异进行比较研究。结果:GH42家族β-半乳糖苷酶氨基酸组成具有偏好性,谷氨酸(E)含量高而赖氨酸(K)含量低,等电点(Isoelectric point,pI)偏低;酶的催化特性与其宿主微生物生长环境呈适应性关联。家族中耐热及耐低温酶存在“成对”进化现象。耐热酶分子结构内部疏水性高,而耐低温酶表面亲水性强。耐低温酶在TIM(Triose-phosphate isomerase,TIM)桶状催化结构域与Domain B链接处以及C-末端存在共性柔性差异显著区域;而耐热酶则通过提高氢键数量及氨基酸P含量增强单体刚性提高作用温度。结论:GH42家族以保守分子结构为基础,通过分子内部与外部疏水性差异分化出耐低温及耐热两类β-半乳糖苷酶。家族酶对温度的适应性是其单体分子结构柔性、氢键数量及聚合态共同作用的结果。本研究从家族进化关系出发,系统探讨了成员酶之间的结构差异及其催化特性分化,为GH42家族β-半乳糖苷酶嗜极性催化特性的深入研究及具有多元耐受特性工程酶的开发提供了通用性参考。
, authors=郭铭菲
1, 郑煜铭
2, 顾海洋
1, 王禄山
3, 董艺凝
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Cold-adapted enzymes: mechanisms, engineering and biotechnological application[J]. Bioprocess and Biosystems Engineering, 2023, 46(10): 1399−1410., articleTitle=null, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1320886954007314814, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320886476016038223, xref=1, ext=[AuthorCompanyExt(id=1320886954015703423, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320886476016038223, companyId=1320886954007314814, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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1滁州学院生物与食品工程学院,安徽滁州 239000)]), AuthorCompany(id=1320886954095395201, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320886476016038223, xref=2, ext=[AuthorCompanyExt(id=1320886954103783810, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320886476016038223, companyId=1320886954095395201, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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2安徽大学生命科学学院,安徽合肥 230000)]), AuthorCompany(id=1320886955722785156, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320886476016038223, xref=3, ext=[AuthorCompanyExt(id=1320886955731173765, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320886476016038223, companyId=1320886955722785156, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
3State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China), AuthorCompanyExt(id=1320886955743756678, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320886476016038223, companyId=1320886955722785156, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
3山东大学微生物技术国家重点实验室,山东青岛 266237)])], figs=[ArticleFig(id=1320886958038041004, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320886476016038223, language=EN, label=Fig.1, caption=
Comparison of the amino acid composition of the known crystal structures β-galactosidase of GH42, GH35 and GH2 families, figureFileSmall=/5QSSL9YJmCz1sbpKGR5Jw==, figureFileBig=dg2dUUUGwErFIekgbiefPQ==, tableContent=null), ArticleFig(id=1320886958126121389, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320886476016038223, language=CN, label=图1, caption=
GH42、GH35及GH2家族已知晶体结构β-半乳糖苷酶氨基酸组成对比, figureFileSmall=/5QSSL9YJmCz1sbpKGR5Jw==, figureFileBig=dg2dUUUGwErFIekgbiefPQ==, tableContent=null), ArticleFig(id=1320886958222590382, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320886476016038223, language=EN, label=Fig.2, caption=
Amino acid distribution of GH42 relative to GH2, GH35 and SWISS-PROT database, figureFileSmall=CL5uHsWl+UCtNseGUpO4mA==, figureFileBig=RCobClILBSVR1B+y67/J7g==, tableContent=null), ArticleFig(id=1320886958285504943, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320886476016038223, language=CN, label=图2, caption=
GH42家族与GH2、GH35和SWISS-PROT数据库氨基酸含量分布差异比较, figureFileSmall=CL5uHsWl+UCtNseGUpO4mA==, figureFileBig=RCobClILBSVR1B+y67/J7g==, tableContent=null), ArticleFig(id=1320886958352613808, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320886476016038223, language=EN, label=Fig.3, caption=
Surface charge and evolutionary analysis of β-galactosidase derived from polarophilic microorganisms of GH42 family, figureFileSmall=cx7hI3kZ/IiVlnrEtzXG6g==, figureFileBig=iwwUbjUEUOC4X1xAPUdW0Q==, tableContent=null), ArticleFig(id=1320886958423916977, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320886476016038223, language=CN, label=图3, caption=
GH42家族嗜极性微生物来源β-半乳糖苷酶表面电荷及进化分析, figureFileSmall=cx7hI3kZ/IiVlnrEtzXG6g==, figureFileBig=iwwUbjUEUOC4X1xAPUdW0Q==, tableContent=null), ArticleFig(id=1320886958503608754, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320886476016038223, language=EN, label=Fig.4, caption=
GRAVY value of known crystal stuctures β-galactosidases in GH42 family, figureFileSmall=yr+p+nVvYs0eNkyKmenTwQ==, figureFileBig=y4Ian+P7Wy7HZ9q6E16+zA==, tableContent=null), ArticleFig(id=1320886960177136051, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320886476016038223, language=CN, label=图4, caption=
GH42家族已知晶体结构β-半乳糖苷酶GRAVY值, figureFileSmall=yr+p+nVvYs0eNkyKmenTwQ==, figureFileBig=y4Ian+P7Wy7HZ9q6E16+zA==, tableContent=null), ArticleFig(id=1320886960277799348, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320886476016038223, language=EN, label=Fig.5, caption=
Comparison of the molecular structure flexibility of 6LVW, 6Y2K and 5E9A, figureFileSmall=Zq2Iv3lvphCkDsngfXSXjA==, figureFileBig=U1QBT+3m74ujfXxZwhrsIg==, tableContent=null), ArticleFig(id=1320886960416211381, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320886476016038223, language=CN, label=图5, caption=
6LVW、6Y2K和5E9A分子结构柔性对比, figureFileSmall=Zq2Iv3lvphCkDsngfXSXjA==, figureFileBig=U1QBT+3m74ujfXxZwhrsIg==, tableContent=null), ArticleFig(id=1320886960533651894, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320886476016038223, language=EN, label=Fig.6, caption=
Comparison of the molecular structure flexibility between thermaostable β-galactosidase 1KWG and 4OIF, figureFileSmall=VezkhII3wyTjZpybUTR0sA==, figureFileBig=vmuxNx0IbL59MapvYbjx8A==, tableContent=null), ArticleFig(id=1320886960638509495, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320886476016038223, language=CN, label=图6, caption=
耐热β-半乳糖苷酶1KWG与4OIF分子结构柔性比较, figureFileSmall=VezkhII3wyTjZpybUTR0sA==, figureFileBig=vmuxNx0IbL59MapvYbjx8A==, tableContent=null), ArticleFig(id=1320886960709812664, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320886476016038223, language=EN, label=Fig.7, caption=
Comparison of structural flexibility between thermostable and cold-stable β-galactosidases in GH42 family, figureFileSmall=5wf4zR0ENssM7e4MVQMktA==, figureFileBig=nBhf6aJvQEPwE0lN/L0e0g==, tableContent=null), ArticleFig(id=1320886960814670265, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320886476016038223, language=CN, label=图7, caption=
GH42家族成对进化耐热与耐低温β-半乳糖苷酶之间结构柔性比较, figureFileSmall=5wf4zR0ENssM7e4MVQMktA==, figureFileBig=nBhf6aJvQEPwE0lN/L0e0g==, tableContent=null), ArticleFig(id=1320886960890167738, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320886476016038223, language=EN, label=Table 1, caption=
Distribution and structural differences of β-galactosidase in glycoside hydrolase families
, figureFileSmall=null, figureFileBig=null, tableContent=
| 家族 | β-半乳糖苷酶晶体结构数量/家族总晶体数量 | 单体序列长度 | 催化结构域 | 单体中Domain 数量 | 聚合体形式 | 首个β-半乳糖苷酶晶体结构 及发布时间 |
|---|
| GH1 | 8/88 | 400~600 aa | TIM | − | 二聚体[12]/四聚体[13−14] | 1GOW(1996.9) |
| GH2 | 13/64 | 700~1000 aa | TIM | 5 | 单体[15−17]/二聚体[18]/三聚体/四聚体[19−20]/六聚体[21]/八聚体[22] | 4V40(1994.4) |
| GH35 | 13/18 | 600~1000 aa | TIM | 6 | 单体[23−27]/二聚体[28−29]/四聚 体[30−31]/十二聚体[32] | 1TG7(2004.5) |
| GH42 | 10/12 | 600~700 aa | TIM | 3 | 三聚体[5−6,9,33−37]/六聚体[38] | 1KWG,1KWK (2002.1) |
| GH50 | 0/4 | − | − | − | − | − |
| GH59 | 0/1 | − | − | − | − | − |
| GH154 | 1/2 | 398 aa | (α/α)6 | − | 四聚体[3] | 8OI4(2024.1) |
), ArticleFig(id=1320886960957276603, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320886476016038223, language=CN, label=表1, caption=
β-半乳糖苷酶在不同糖苷水解酶家族中的分布及结构差异
, figureFileSmall=null, figureFileBig=null, tableContent=
| 家族 | β-半乳糖苷酶晶体结构数量/家族总晶体数量 | 单体序列长度 | 催化结构域 | 单体中Domain 数量 | 聚合体形式 | 首个β-半乳糖苷酶晶体结构 及发布时间 |
|---|
| GH1 | 8/88 | 400~600 aa | TIM | − | 二聚体[12]/四聚体[13−14] | 1GOW(1996.9) |
| GH2 | 13/64 | 700~1000 aa | TIM | 5 | 单体[15−17]/二聚体[18]/三聚体/四聚体[19−20]/六聚体[21]/八聚体[22] | 4V40(1994.4) |
| GH35 | 13/18 | 600~1000 aa | TIM | 6 | 单体[23−27]/二聚体[28−29]/四聚 体[30−31]/十二聚体[32] | 1TG7(2004.5) |
| GH42 | 10/12 | 600~700 aa | TIM | 3 | 三聚体[5−6,9,33−37]/六聚体[38] | 1KWG,1KWK (2002.1) |
| GH50 | 0/4 | − | − | − | − | − |
| GH59 | 0/1 | − | − | − | − | − |
| GH154 | 1/2 | 398 aa | (α/α)6 | − | 四聚体[3] | 8OI4(2024.1) |
), ArticleFig(id=1320886961062134204, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320886476016038223, language=EN, label=Table 2, caption=
Main characteristics of known 3D structure GH 42 β-galactosidases
, figureFileSmall=null, figureFileBig=null, tableContent=
来源微生物 特点 | 来源微生物 (酶代号) | PDB ID | 催化氨基酸位点 | 序列相 似性(%) | Cα RMSD (Ǻ) | 催化特性 |
|---|
| 嗜热 | Thermus sp. A4(A4-β-Gal) | 1KWG 1KWK | E141 E312 | 100 | 0.00 | 三聚体;Topt70 ℃,pH6.5;对乳糖亲和力弱。 |
| G. stearothermophilus T-6 (GanB;Gan42B) | 4OIF 4OJY 5DFA | E158 E323 | 26.3 | 1.98 | 三聚体;Topt 53 ℃,pH6.0;无乳糖活性;无转糖苷活性;对GOS有催化活性。 |
| 嗜冷、嗜盐(来自南极冰湖) | H. lacusprofundi (Bga) | 6LVW | E142 E312 | 45.4 | 1.44 | 三聚体;4 mol/L NaCl 或 KCl存在条件下,Topt 50~55 ℃,pH6.5;4~10 ℃下可保留10%~13%活性。 |
嗜冷 (来自南极) | Marinomonas ef1 (M-bgal) | 6Y2K | E142 E314 | 54.0 | 0.96 | 六聚体;Topt 5 ℃,37~50 ℃稳定;pH6.0。 |
| 嗜冷 | Rahnella sp. R3 (R-β-Gal) | 5E9A | E157 E314 | 30.6 | 1.90 | 三聚体;4 ℃活性高;作用温度4~35 ℃,pH6.5。 |
| 嗜碱 | B. circulans sp. alkalophilus (Bcα-β-Gal) | 3TTS 3TTY | E150 E307 | 29.2 | 1.75 | 六聚体;Topt 55 ℃,最适作用pH6~7.5;对乳糖亲和力低,具有弱转糖苷活性。 |
| 肠道益生菌 | B. animalis subsp. Lactis (Gal42A) | 4UNI 4UOQ 4UOZ | E159 E323 | 27.3 | 1.86 | 三聚体;Topt 45 ℃,pH5.5。 |
| B. bifidum S17(BbgII) | 4UCF 4UZS | E161 E320 | 26.9 | 1.89 | 三聚体;Topt 40 ℃, pH6.0;无GOS合成能力。 |
| B. animalis subsp. lactis Bl-04 (BlArap42B) | 5XB7 | E151 E311 | 25.7 | 1.91 | 三聚体;Topt 30 ℃,pH6.5。 |
| B. longum subsp. infantis (BiBga42A) | 8IBR 8IBS 8IBT | E160 E318 | 29.5 | 1.85 | 三聚体;Topt 37 ℃,pH6.5;LNT利用能力。 |
), ArticleFig(id=1320886961146020285, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320886476016038223, language=CN, label=表2, caption=
GH42家族已知晶体结构β-半乳糖苷酶特性
, figureFileSmall=null, figureFileBig=null, tableContent=
来源微生物 特点 | 来源微生物 (酶代号) | PDB ID | 催化氨基酸位点 | 序列相 似性(%) | Cα RMSD (Ǻ) | 催化特性 |
|---|
| 嗜热 | Thermus sp. A4(A4-β-Gal) | 1KWG 1KWK | E141 E312 | 100 | 0.00 | 三聚体;Topt70 ℃,pH6.5;对乳糖亲和力弱。 |
| G. stearothermophilus T-6 (GanB;Gan42B) | 4OIF 4OJY 5DFA | E158 E323 | 26.3 | 1.98 | 三聚体;Topt 53 ℃,pH6.0;无乳糖活性;无转糖苷活性;对GOS有催化活性。 |
| 嗜冷、嗜盐(来自南极冰湖) | H. lacusprofundi (Bga) | 6LVW | E142 E312 | 45.4 | 1.44 | 三聚体;4 mol/L NaCl 或 KCl存在条件下,Topt 50~55 ℃,pH6.5;4~10 ℃下可保留10%~13%活性。 |
嗜冷 (来自南极) | Marinomonas ef1 (M-bgal) | 6Y2K | E142 E314 | 54.0 | 0.96 | 六聚体;Topt 5 ℃,37~50 ℃稳定;pH6.0。 |
| 嗜冷 | Rahnella sp. R3 (R-β-Gal) | 5E9A | E157 E314 | 30.6 | 1.90 | 三聚体;4 ℃活性高;作用温度4~35 ℃,pH6.5。 |
| 嗜碱 | B. circulans sp. alkalophilus (Bcα-β-Gal) | 3TTS 3TTY | E150 E307 | 29.2 | 1.75 | 六聚体;Topt 55 ℃,最适作用pH6~7.5;对乳糖亲和力低,具有弱转糖苷活性。 |
| 肠道益生菌 | B. animalis subsp. Lactis (Gal42A) | 4UNI 4UOQ 4UOZ | E159 E323 | 27.3 | 1.86 | 三聚体;Topt 45 ℃,pH5.5。 |
| B. bifidum S17(BbgII) | 4UCF 4UZS | E161 E320 | 26.9 | 1.89 | 三聚体;Topt 40 ℃, pH6.0;无GOS合成能力。 |
| B. animalis subsp. lactis Bl-04 (BlArap42B) | 5XB7 | E151 E311 | 25.7 | 1.91 | 三聚体;Topt 30 ℃,pH6.5。 |
| B. longum subsp. infantis (BiBga42A) | 8IBR 8IBS 8IBT | E160 E318 | 29.5 | 1.85 | 三聚体;Topt 37 ℃,pH6.5;LNT利用能力。 |
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