Ser475, Glu272, Asp276, Asp327, and Asp360 are involved in catalytic activity of human tripeptidyl-peptidase I.
Ser475, Glu272, Asp276, Asp327, and Asp360 are involved in catalytic activity of human tripeptidyl-peptidase I.
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Ser475、Glu272、Asp276、Asp327 和 Asp360 参与人三肽基肽酶 I 的催化活性。
DOI:
10.1016/j.febslet.2005.01.035
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发表时间:
2005
期刊:
影响因子:
--
通讯作者:
Golabek,AdamA
中科院分区:
文献类型:
--
作者:
Walus,Mariusz;Kida,Elizabeth;Wisniewski,KrystynaE;Golabek,AdamA
Tripeptidyl-peptidase I (TPP I) is a lysosomal aminopeptidase that sequentially removes tripeptides from small polypeptides and also shows a minor endoprotease activity. Mutations in TPP I are associated with a fatal lysosomal storage disorder – the classic late-infantile form of neuronal ceroid lipofuscinoses. In the present study, we analyzed the catalytic mechanism of the human enzyme by using a site-directed mutagenesis. We demonstrate that apart from previously identified Ser475and Asp360, also Glu272, Asp276, and Asp327are important for catalytic activity of the enzyme. Involvement of serine, glutamic acid, and aspartic acid in the catalytic reaction validates the idea, formulated on the basis of significant amino acid sequence homology and inhibition studies, that TPP I is the first mammalian representative of a growing family of serine-carboxyl peptidases.
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