1uch

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{{STRUCTURE_1uch| PDB=1uch | SCENE= }}
{{STRUCTURE_1uch| PDB=1uch | SCENE= }}
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'''DEUBIQUITINATING ENZYME UCH-L3 (HUMAN) AT 1.8 ANGSTROM RESOLUTION'''
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===DEUBIQUITINATING ENZYME UCH-L3 (HUMAN) AT 1.8 ANGSTROM RESOLUTION===
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==Overview==
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Ubiquitin C-terminal hydrolases catalyze the removal of adducts from the C-terminus of ubiquitin. We have determined the crystal structure of the recombinant human Ubiquitin C-terminal Hydrolase (UCH-L3) by X-ray crystallography at 1.8 A resolution. The structure is comprised of a central antiparallel beta-sheet flanked on both sides by alpha-helices. The beta-sheet and one of the helices resemble the well-known papain-like cysteine proteases, with the greatest similarity to cathepsin B. This similarity includes the UCH-L3 active site catalytic triad of Cys95, His169 and Asp184, and the oxyanion hole residue Gln89. Papain and UCH-L3 differ, however, in strand and helix connectivity, which in the UCH-L3 structure includes a disordered 20 residue loop (residues 147-166) that is positioned over the active site and may function in the definition of substrate specificity. Based upon analogy with inhibitor complexes of the papain-like enzymes, we propose a model describing the binding of ubiquitin to UCH-L3. The UCH-L3 active site cleft appears to be masked in the unliganded structure by two different segments of the enzyme (residues 9-12 and 90-94), thus implying a conformational change upon substrate binding and suggesting a mechanism to limit non-specific hydrolysis.
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==About this Structure==
==About this Structure==
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[[Category: Ubiquitin]]
[[Category: Ubiquitin]]
[[Category: Ubiquitin conjugation]]
[[Category: Ubiquitin conjugation]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 21:48:40 2008''

Revision as of 18:48, 27 July 2008

Image:1uch.png

Template:STRUCTURE 1uch

DEUBIQUITINATING ENZYME UCH-L3 (HUMAN) AT 1.8 ANGSTROM RESOLUTION

Template:ABSTRACT PUBMED 9233788

About this Structure

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

Reference

Crystal structure of a deubiquitinating enzyme (human UCH-L3) at 1.8 A resolution., Johnston SC, Larsen CN, Cook WJ, Wilkinson KD, Hill CP, EMBO J. 1997 Jul 1;16(13):3787-96. PMID:9233788

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