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| | ==Crystal structure of the protein secretion chaperone CsaA from Agrobacterium tumefaciens.== | | ==Crystal structure of the protein secretion chaperone CsaA from Agrobacterium tumefaciens.== |
| - | <StructureSection load='2q2i' size='340' side='right' caption='[[2q2i]], [[Resolution|resolution]] 1.55Å' scene=''> | + | <StructureSection load='2q2i' size='340' side='right'caption='[[2q2i]], [[Resolution|resolution]] 1.55Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[2q2i]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Agrfc Agrfc]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2Q2I OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2Q2I FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[2q2i]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Agrfc Agrfc]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2Q2I OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2Q2I FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> | + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2q2h|2q2h]]</td></tr> | + | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[2q2h|2q2h]]</div></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">csaA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=176299 AGRFC])</td></tr> | + | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">csaA ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=176299 AGRFC])</td></tr> |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2q2i FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2q2i OCA], [http://pdbe.org/2q2i PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2q2i RCSB], [http://www.ebi.ac.uk/pdbsum/2q2i PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2q2i ProSAT]</span></td></tr> | + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2q2i FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2q2i OCA], [https://pdbe.org/2q2i PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2q2i RCSB], [https://www.ebi.ac.uk/pdbsum/2q2i PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2q2i ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Evolutionary Conservation == | | == Evolutionary Conservation == |
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| | </StructureSection> | | </StructureSection> |
| | [[Category: Agrfc]] | | [[Category: Agrfc]] |
| | + | [[Category: Large Structures]] |
| | [[Category: Feldman, A R]] | | [[Category: Feldman, A R]] |
| | [[Category: Paetzel, M]] | | [[Category: Paetzel, M]] |
| Structural highlights
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
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.
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[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Feldman AR, Shapova YA, Wu SS, Oliver DC, Heller M, McIntosh LP, Scott JK, Paetzel M. Phage display and crystallographic analysis reveals potential substrate/binding site interactions in the protein secretion chaperone CsaA from Agrobacterium tumefaciens. J Mol Biol. 2008 Jun 6;379(3):457-70. Epub 2008 Mar 28. PMID:18462752 doi:10.1016/j.jmb.2008.03.048
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