This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.

Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.

2fm9

From Proteopedia

(Difference between revisions)

Jump to: navigation, search

Revision as of 07:54, 24 December 2014

Structure of Salmonella SipA residues 48-264

Structural highlights

2fm9 is a 1 chain structure with sequence from Salmonella enterica subsp. enterica serovar typhimurium. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Gene:	sipA, sspA (Salmonella enterica subsp. enterica serovar Typhimurium)
Resources:	FirstGlance, OCA, RCSB, PDBsum

Function

[SIPA_SALTY] Actin-binding protein that interferes with host cell actin cytoskeleton. It stimulates actin polymerization and counteracts F-actin destabilizing proteins. Potentiates SipC activity; both are required for an efficient bacterial internalization. In vitro, forms a complex with host cell protein T-plastin increasing actin bundling. It inhibits ADF/cofilin-directed depolymerization both by preventing binding of ADF and cofilin and by displacing them from F-actin. Also protects F-actin from gelsolin-directed severing and reanneals gelsolin-severed F-actin fragments.^[1] ^[2]

Publication Abstract from PubMed

Salmonella invasion protein A (SipA) is translocated into host cells by a type III secretion system (T3SS) and comprises two regions: one domain binds its cognate type III secretion chaperone, InvB, in the bacterium to facilitate translocation, while a second domain functions in the host cell, contributing to bacterial uptake by polymerizing actin. We present here the crystal structures of the SipA chaperone binding domain (CBD) alone and in complex with InvB. The SipA CBD is found to consist of a nonglobular polypeptide as well as a large globular domain, both of which are necessary for binding to InvB. We also identify a structural motif that may direct virulence factors to their cognate chaperones in a diverse range of pathogenic bacteria. Disruption of this structural motif leads to a destabilization of several chaperone-substrate complexes from different species, as well as an impairment of secretion in Salmonella.

A common structural motif in the binding of virulence factors to bacterial secretion chaperones.,Lilic M, Vujanac M, Stebbins CE Mol Cell. 2006 Mar 3;21(5):653-64. PMID:16507363^[3]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Zhou D, Mooseker MS, Galan JE. Role of the S. typhimurium actin-binding protein SipA in bacterial internalization. Science. 1999 Mar 26;283(5410):2092-5. PMID:10092234
↑ McGhie EJ, Hayward RD, Koronakis V. Control of actin turnover by a salmonella invasion protein. Mol Cell. 2004 Feb 27;13(4):497-510. PMID:14992720
↑ Lilic M, Vujanac M, Stebbins CE. A common structural motif in the binding of virulence factors to bacterial secretion chaperones. Mol Cell. 2006 Mar 3;21(5):653-64. PMID:16507363 doi:10.1016/j.molcel.2006.01.026

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/2fm9"

@@ Line 6: / Line 6: @@
 <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=2fm9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2fm9 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2fm9 RCSB], [http://www.ebi.ac.uk/pdbsum/2fm9 PDBsum]</span></td></tr>
 </table>
+== Function ==
+[[http://www.uniprot.org/uniprot/SIPA_SALTY SIPA_SALTY]] Actin-binding protein that interferes with host cell actin cytoskeleton. It stimulates actin polymerization and counteracts F-actin destabilizing proteins. Potentiates SipC activity; both are required for an efficient bacterial internalization. In vitro, forms a complex with host cell protein T-plastin increasing actin bundling. It inhibits ADF/cofilin-directed depolymerization both by preventing binding of ADF and cofilin and by displacing them from F-actin. Also protects F-actin from gelsolin-directed severing and reanneals gelsolin-severed F-actin fragments.<ref>PMID:10092234</ref> <ref>PMID:14992720</ref>
 <div style="background-color:#fffaf0;">
 == Publication Abstract from PubMed ==

2fm9

From Proteopedia

Revision as of 07:54, 24 December 2014

Structure of Salmonella SipA residues 48-264

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox