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From Proteopedia
GROEL (HSP60 CLASS) FRAGMENT (APICAL DOMAIN) COMPRISING RESIDUES 191-376, MUTANT WITH ALA 262 REPLACED WITH LEU AND ILE 267 REPLACED WITH MET
Structural highlights
FunctionCH60_ECOLI Prevents misfolding and promotes the refolding and proper assembly of unfolded polypeptides generated under stress conditions.[HAMAP-Rule:MF_00600] Essential for the growth of the bacteria and the assembly of several bacteriophages. Also plays a role in coupling between replication of the F plasmid and cell division of the cell.[HAMAP-Rule:MF_00600] Evolutionary ConservationCheck, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedA monomeric peptide fragment of GroEL, consisting of residues 191-376, is a mini-chaperone with a functional chaperoning activity. We have solved the crystal structure at 1.7 A resolution of GroEL(191-376) with a 17-residue N-terminal tag. The N-terminal tag of one molecule binds in the active site of a neighboring molecule in the crystal. This appears to mimic the binding of a peptide substrate molecule. Seven substrate residues are bound in a relatively extended conformation. Interactions between the substrate and the active site are predominantly hydrophobic, but there are also four hydrogen bonds between the main chain of the substrate and side chains of the active site. Although the preferred conformation of a bound substrate is essentially extended, the flexibility of the active site may allow it to accommodate the binding of exposed hydrophobic surfaces in general, such as molten globule-type structures. GroEL can therefore help unfold proteins by binding to a hydrophobic region and exert a binding pressure toward the fully unfolded state, thus acting as an "unfoldase." The structure of the mini-chaperone is very similar to that of residues 191-376 in intact GroEL, so we can build it into GroEL and reconstruct how a peptide can bind to the tetradecamer. A ring of connected binding sites is noted that can explain many aspects of substrate binding and activity. A structural model for GroEL-polypeptide recognition.,Buckle AM, Zahn R, Fersht AR Proc Natl Acad Sci U S A. 1997 Apr 15;94(8):3571-5. PMID:9108017[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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