通过突变去除假定的必需组氨酸残基而使羧基肽酶Y失活。

L M Bech, K Breddam
{"title":"通过突变去除假定的必需组氨酸残基而使羧基肽酶Y失活。","authors":"L M Bech,&nbsp;K Breddam","doi":"10.1007/BF02904470","DOIUrl":null,"url":null,"abstract":"<p><p>Carboxypeptidase Y is a serine carboxypeptidase assumed to contain a catalytic triad similar to the serine endopeptidases. On the basis of the homology between various serine carboxypeptidases His-397 is suspected to be part of the catalytic triad. To test this it was exchanged with Ala and Arg by site-directed mutagenesis of the cloned PRC1 gene. The catalytic efficiency of the mutant enzymes were reduced by a factor of 2 X 10(4) and 7 X 10(2), respectively, confirming the key role of His-397 in catalysis. Treatment of Ala-397-CPD-Y with Hg++ or CNBr, hence modifying Cys-341 located in the vicinity of the active site abolished the residual activity of the enzyme, indicating an additional involvement of this residue in catalysis.</p>","PeriodicalId":9616,"journal":{"name":"Carlsberg Research Communications","volume":"54 5","pages":"165-71"},"PeriodicalIF":0.0000,"publicationDate":"1989-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/BF02904470","citationCount":"24","resultStr":"{\"title\":\"Inactivation of carboxypeptidase Y by mutational removal of the putative essential histidyl residue.\",\"authors\":\"L M Bech,&nbsp;K Breddam\",\"doi\":\"10.1007/BF02904470\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>Carboxypeptidase Y is a serine carboxypeptidase assumed to contain a catalytic triad similar to the serine endopeptidases. On the basis of the homology between various serine carboxypeptidases His-397 is suspected to be part of the catalytic triad. To test this it was exchanged with Ala and Arg by site-directed mutagenesis of the cloned PRC1 gene. The catalytic efficiency of the mutant enzymes were reduced by a factor of 2 X 10(4) and 7 X 10(2), respectively, confirming the key role of His-397 in catalysis. Treatment of Ala-397-CPD-Y with Hg++ or CNBr, hence modifying Cys-341 located in the vicinity of the active site abolished the residual activity of the enzyme, indicating an additional involvement of this residue in catalysis.</p>\",\"PeriodicalId\":9616,\"journal\":{\"name\":\"Carlsberg Research Communications\",\"volume\":\"54 5\",\"pages\":\"165-71\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1989-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1007/BF02904470\",\"citationCount\":\"24\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Carlsberg Research Communications\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1007/BF02904470\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Carlsberg Research Communications","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1007/BF02904470","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 24

摘要

羧基肽酶Y是一种丝氨酸羧基肽酶,被认为含有类似于丝氨酸内肽酶的催化三联体。根据各种丝氨酸羧基肽酶之间的同源性,推测His-397是催化三联体的一部分。为了验证这一点,将克隆的PRC1基因通过定点诱变与Ala和Arg交换。突变酶的催化效率分别降低了2 × 10(4)和7 × 10(2),证实了His-397在催化中的关键作用。用Hg++或CNBr处理α -397- cpd - y,从而修饰位于活性位点附近的Cys-341,消除了酶的残留活性,表明该残基参与了催化作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Inactivation of carboxypeptidase Y by mutational removal of the putative essential histidyl residue.

Carboxypeptidase Y is a serine carboxypeptidase assumed to contain a catalytic triad similar to the serine endopeptidases. On the basis of the homology between various serine carboxypeptidases His-397 is suspected to be part of the catalytic triad. To test this it was exchanged with Ala and Arg by site-directed mutagenesis of the cloned PRC1 gene. The catalytic efficiency of the mutant enzymes were reduced by a factor of 2 X 10(4) and 7 X 10(2), respectively, confirming the key role of His-397 in catalysis. Treatment of Ala-397-CPD-Y with Hg++ or CNBr, hence modifying Cys-341 located in the vicinity of the active site abolished the residual activity of the enzyme, indicating an additional involvement of this residue in catalysis.

求助全文
通过发布文献求助,成功后即可免费获取论文全文。 去求助
来源期刊
自引率
0.00%
发文量
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信