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2q2h

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{{STRUCTURE_2q2h| PDB=2q2h | SCENE= }}
{{STRUCTURE_2q2h| PDB=2q2h | SCENE= }}
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'''Crystal structure of the protein secretion chaperone CsaA from Agrobacterium tumefaciens with a genetically fused phage-display derived peptide substrate at the N-terminus.'''
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===Crystal structure of the protein secretion chaperone CsaA from Agrobacterium tumefaciens with a genetically fused phage-display derived peptide substrate at the N-terminus.===
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==Overview==
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The protein CsaA has been proposed to function as a protein secretion chaperone in bacteria that lack the Sec-dependent protein-targeting chaperone SecB. CsaA is a homodimer with two putative substrate-binding pockets, one in each monomer. To test the hypothesis that these cavities are indeed substrate-binding sites able to interact with other polypeptide chains, we selected a peptide that bound to CsaA from a random peptide library displayed on phage. Presented here is the structure of CsaA from Agrobacterium tumefaciens (AtCsaA) solved in the presence and absence of the selected peptide. To promote co-crystallization, the sequence for this peptide was genetically fused to the amino-terminus of AtCsaA. The resulting 1.65 A resolution crystal structure reveals that the tethered peptide from one AtCsaA molecule binds to the proposed substrate-binding pocket of a symmetry-related molecule possibly mimicking the interaction between a pre-protein substrate and CsaA. The structure shows that the peptide lies in an extended conformation with alanine, proline and glutamine side chains pointing into the binding pocket. The peptide interacts with the atoms of the AtCsaA-binding pocket via seven direct hydrogen bonds. The side chain of a conserved pocket residue, Arg76, has an "up" conformation when the CsaA-binding site is empty and a "down" conformation when the CsaA-binding site is occupied, suggesting that this residue may function to stabilize the peptide in the binding cavity. The presented aggregation assays, phage-display analysis and structural analysis are consistent with AtCsaA being a general chaperone. The properties of the proposed CsaA-binding pocket/peptide interactions are compared to those from other structurally characterized molecular chaperones.
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{{ABSTRACT_PUBMED_18462752}}
==About this Structure==
==About this Structure==
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[[Category: Ob fold]]
[[Category: Ob fold]]
[[Category: Protein secretion]]
[[Category: Protein secretion]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 16:05:38 2008''

Revision as of 13:05, 27 July 2008

Image:2q2h.png

Template:STRUCTURE 2q2h

Crystal structure of the protein secretion chaperone CsaA from Agrobacterium tumefaciens with a genetically fused phage-display derived peptide substrate at the N-terminus.

Template:ABSTRACT PUBMED 18462752

About this Structure

2Q2H is a Single protein structure of sequence from Agrobacterium tumefaciens str. c58. Full crystallographic information is available from OCA.

Reference

Phage display and crystallographic analysis reveals potential substrate/binding site interactions in the protein secretion chaperone CsaA from Agrobacterium tumefaciens., Feldman AR, Shapova YA, Wu SS, Oliver DC, Heller M, McIntosh LP, Scott JK, Paetzel M, J Mol Biol. 2008 Jun 6;379(3):457-70. Epub 2008 Mar 28. PMID:18462752

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