View source for 2lbt


==Solution structure of the C domain of RV0899(D236A) from mycobacterium tuberculosis==
<StructureSection load='2lbt' size='340' side='right'caption='[[2lbt]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2lbt]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Mycobacterium_tuberculosis Mycobacterium tuberculosis]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2LBT OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2LBT FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR, 20 models</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=2lbt FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2lbt OCA], [https://pdbe.org/2lbt PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2lbt RCSB], [https://www.ebi.ac.uk/pdbsum/2lbt PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2lbt ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/ARFA_MYCTU ARFA_MYCTU] Probably plays a role in ammonia secretion that neutralizes the medium at pH 5.5, although it does not play a direct role in ammonia transport. The OmpA-like domain (196-326) binds M.tuberculosis peptidoglycan. Overexpression in M.bovis or M.smegmatis gives channels with average conductance value of 1,600 +/- 100 pS, but this may not be physiologically relevant.<ref>PMID:12366842</ref> <ref>PMID:17573469</ref> <ref>PMID:21410778</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Mycobacterium tuberculosis ArfA (Rv0899) is a membrane protein encoded by an operon that is required for supporting bacterial growth in acidic environments. Its C-terminal domain (C domain) shares significant sequence homology with the OmpA-like family of peptidoglycan-binding domains, suggesting that its physiological function in acid stress protection may be related to its interaction with the mycobacterial cell wall. Previously, we showed that ArfA forms three independently structured modules, and we reported the structure of its central domain (B domain). Here, we describe the high-resolution structure and dynamics of the C domain, we identify ArfA as a peptidoglycan-binding protein and we elucidate the molecular basis for its specific recognition of diaminopimelate-type peptidoglycan. The C domain of ArfA adopts the characteristic fold of the OmpA-like family. It exhibits pH-dependent conformational dynamics (with significant heterogeneity at neutral pH and a more ordered structure at acidic pH), which could be related to its acid stress response. The C domain associates tightly with polymeric peptidoglycan isolated from M. tuberculosis and also associates with a soluble peptide intermediate of peptidoglycan biosynthesis. This enabled us to characterize the peptidoglycan binding site where five highly conserved ArfA residues, including two key arginines, establish the specificity for diaminopimelate- but not Lys-type peptidoglycan. ArfA is the first peptidoglycan-binding protein to be identified in M. tuberculosis. Its functions in acid stress protection and peptidoglycan binding suggest a link between the acid stress response and the physicochemical properties of the mycobacterial cell wall.

Molecular Structure and Peptidoglycan Recognition of Mycobacterium tuberculosis ArfA (Rv0899).,Yao Y, Barghava N, Kim J, Niederweis M, Marassi FM J Mol Biol. 2012 Feb 17;416(2):208-20. Epub 2011 Dec 21. PMID:22206986<ref>PMID:22206986</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
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== References ==
<references/>
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</StructureSection>
[[Category: Large Structures]]
[[Category: Mycobacterium tuberculosis]]
[[Category: Marassi F]]
[[Category: Yao Y]]