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|1cmx, resolution 2.25Å ()|
STRUCTURAL BASIS FOR THE SPECIFICITY OF UBIQUITIN C-TERMINAL HYDROLASES
The release of ubiquitin from attachment to other proteins and adducts is critical for ubiquitin biosynthesis, proteasomal degradation and other cellular processes. De-ubiquitination is accomplished in part by members of the UCH (ubiquitin C-terminal hydrolase) family of enzymes. We have determined the 2.25 A resolution crystal structure of the yeast UCH, Yuh1, in a complex with the inhibitor ubiquitin aldehyde (Ubal). The structure mimics the tetrahedral intermediate in the reaction pathway and explains the very high enzyme specificity. Comparison with a related, unliganded UCH structure indicates that ubiquitin binding is coupled to rearrangements which block the active-site cleft in the absence of authentic substrate. Remarkably, a 21-residue loop that becomes ordered upon binding Ubal lies directly over the active site. Efficiently processed substrates apparently pass through this loop, and constraints on the loop conformation probably function to control UCH specificity.
Structural basis for the specificity of ubiquitin C-terminal hydrolases., Johnston SC, Riddle SM, Cohen RE, Hill CP, EMBO J. 1999 Jul 15;18(14):3877-87. PMID:10406793
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
About this Structure
1cmx is a 4 chain structure. Full crystallographic information is available from OCA.
- Johnston SC, Riddle SM, Cohen RE, Hill CP. Structural basis for the specificity of ubiquitin C-terminal hydrolases. EMBO J. 1999 Jul 15;18(14):3877-87. PMID:10406793 doi:http://dx.doi.org/10.1093/emboj/18.14.3877
- Virnau P, Mirny LA, Kardar M. Intricate knots in proteins: Function and evolution. PLoS Comput Biol. 2006 Sep 15;2(9):e122. Epub 2006 Jul 28. PMID:16978047 doi:10.1371/journal.pcbi.0020122