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2fzs

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[[Image:2fzs.gif|left|200px]]
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{{STRUCTURE_2fzs| PDB=2fzs | SCENE= }}
{{STRUCTURE_2fzs| PDB=2fzs | SCENE= }}
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'''Crystal structure of E. coli ClpP with a Peptide Chloromethyl Ketone Covalently Bound at the Active Site'''
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===Crystal structure of E. coli ClpP with a Peptide Chloromethyl Ketone Covalently Bound at the Active Site===
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==Overview==
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ClpP, the proteolytic component of the ATP-dependent ClpAP and ClpXP chaperone/protease complexes, has 14 identical subunits organized in two stacked heptameric rings. The active sites are in an interior aqueous chamber accessible through axial channels. We have determined a 1.9 A crystal structure of Escherichia coli ClpP with benzyloxycarbonyl-leucyltyrosine chloromethyl ketone (Z-LY-CMK) bound at each active site. The complex mimics a tetrahedral intermediate during peptide cleavage, with the inhibitor covalently linked to the active site residues, Ser97 and His122. Binding is further stabilized by six hydrogen bonds between backbone atoms of the peptide and ClpP as well as by hydrophobic binding of the phenolic ring of tyrosine in the S1 pocket. The peptide portion of Z-LY-CMK displaces three water molecules in the native enzyme resulting in little change in the conformation of the peptide binding groove. The heptameric rings of ClpP-CMK are slightly more compact than in native ClpP, but overall structural changes were minimal (rmsd approximately 0.5 A). The side chain of Ser97 is rotated approximately 90 degrees in forming the covalent adduct with Z-LY-CMK, indicating that rearrangement of the active site residues to a active configuration occurs upon substrate binding. The N-terminal peptide of ClpP-CMK is stabilized in a beta-hairpin conformation with the proximal N-terminal residues lining the axial channel and the loop extending beyond the apical surface of the heptameric ring. The lack of major substrate-induced conformational changes suggests that changes in ClpP structure needed to facilitate substrate entry or product release must be limited to rigid body motions affecting subunit packing or contacts between ClpP rings.
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(as it appears on PubMed at http://www.pubmed.gov), where 16682229 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16682229}}
==About this Structure==
==About this Structure==
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[[Category: Atp-dependent clpp protease]]
[[Category: Atp-dependent clpp protease]]
[[Category: Z-leu-tyr chloromethyl ketone inhibitor]]
[[Category: Z-leu-tyr chloromethyl ketone inhibitor]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 04:31:01 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 02:03:35 2008''

Revision as of 23:03, 27 July 2008

Image:2fzs.png

Template:STRUCTURE 2fzs

Crystal structure of E. coli ClpP with a Peptide Chloromethyl Ketone Covalently Bound at the Active Site

Template:ABSTRACT PUBMED 16682229

About this Structure

2FZS is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Crystal structure at 1.9A of E. coli ClpP with a peptide covalently bound at the active site., Szyk A, Maurizi MR, J Struct Biol. 2006 Oct;156(1):165-74. Epub 2006 Apr 21. PMID:16682229

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