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1i7k

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{{STRUCTURE_1i7k| PDB=1i7k | SCENE= }}
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'''CRYSTAL STRUCTURE OF HUMAN MITOTIC-SPECIFIC UBIQUITIN-CONJUGATING ENZYME, UBCH10'''
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===CRYSTAL STRUCTURE OF HUMAN MITOTIC-SPECIFIC UBIQUITIN-CONJUGATING ENZYME, UBCH10===
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==Overview==
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Cell cycle progression is controlled at several different junctures by the targeted destruction of cell cycle regulatory proteins. These carefully orchestrated events include the destruction of the securin protein to permit entry into anaphase, and the destruction of cyclin B to permit exit from mitosis. These destruction events are mediated by the ubiquitin/proteasome system. The human ubiquitin-conjugating enzyme, UbcH10, is an essential mediator of the mitotic destruction events. We report here the 1.95-A crystal structure of a mutant UbcH10, in which the active site cysteine has been replaced with a serine. Functional analysis indicates that the mutant is active in accepting ubiquitin, although not as efficiently as wild-type. Examination of the crystal structure reveals that the NH2-terminal extension in UbcH10 is disordered and that a conserved 3(10)-helix places a lysine residue near the active site. Analysis of relevant mutants demonstrates that for ubiquitin-adduct formation the presence or absence of the NH2-terminal extension has little effect, whereas the lysine residue near the active site has significant effect. The structure provides additional insight into UbcH10 function including possible sites of interaction with the anaphase promoting complex/cyclosome and the disposition of a putative destruction box motif in the structure.
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(as it appears on PubMed at http://www.pubmed.gov), where 11927573 is the PubMed ID number.
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{{ABSTRACT_PUBMED_11927573}}
==About this Structure==
==About this Structure==
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[[Category: Lin, Y.]]
[[Category: Lin, Y.]]
[[Category: Ubiquitin conjugating enzyme]]
[[Category: Ubiquitin conjugating enzyme]]
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Revision as of 07:32, 1 July 2008

Image:1i7k.png

Template:STRUCTURE 1i7k

CRYSTAL STRUCTURE OF HUMAN MITOTIC-SPECIFIC UBIQUITIN-CONJUGATING ENZYME, UBCH10

Template:ABSTRACT PUBMED 11927573

About this Structure

1I7K is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Structural and functional analysis of the human mitotic-specific ubiquitin-conjugating enzyme, UbcH10., Lin Y, Hwang WC, Basavappa R, J Biol Chem. 2002 Jun 14;277(24):21913-21. Epub 2002 Apr 1. PMID:11927573

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