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2kgs

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Revision as of 10:27, 6 September 2023

Solution structure of the amino-terminal domain of OmpATb, a pore forming protein from Mycobacterium tuberculosis

Structural highlights

2kgs is a 1 chain structure with sequence from Mycobacterium tuberculosis. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	Solution NMR
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

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.^[1] ^[2] ^[3]

Publication Abstract from PubMed

The pore-forming outer membrane protein OmpATb from Mycobacterium tuberculosis is a virulence factor required for acid resistance in host phagosomes. In this study, we determined the 3D structure of OmpATb by NMR in solution. We found that OmpATb is composed of two independent domains separated by a proline-rich hinge region. As expected, the high-resolution structure of the C-terminal domain (OmpATb(198-326)) revealed a module structurally related to other OmpA-like proteins from Gram-negative bacteria. The N-terminal domain of OmpATb (73-204), which is sufficient to form channels in planar lipid bilayers, exhibits a fold, which belongs to the alpha+beta sandwich class fold. Its peculiarity is to be composed of two overlapping subdomains linked via a BON (Bacterial OsmY and Nodulation) domain initially identified in bacterial proteins predicted to interact with phospholipids. Although OmpATb(73-204) is highly water soluble, current-voltage measurements demonstrate that it is able to form conducting pores in model membranes. A HADDOCK modeling of the NMR data gathered on the major monomeric form and on the minor oligomeric populations of OmpATb(73-204) suggest that OmpATb(73-204) can form oligomeric rings able to insert into phospholipid membrane, similar to related proteins from the Type III secretion systems, which form multisubunits membrane-associated rings at the basal body of the secretion machinery. Proteins 2010. (c) 2010 Wiley-Liss, Inc.

Structure of the Mycobacterium tuberculosis OmpATb protein: A model of an oligomeric channel in the mycobacterial cell wall.,Yang Y, Auguin D, Delbecq S, Dumas E, Molle G, Molle V, Roumestand C, Saint N Proteins. 2010 Oct 12. PMID:21117233^[4]

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

References

↑ Raynaud C, Papavinasasundaram KG, Speight RA, Springer B, Sander P, Bottger EC, Colston MJ, Draper P. The functions of OmpATb, a pore-forming protein of Mycobacterium tuberculosis. Mol Microbiol. 2002 Oct;46(1):191-201. PMID:12366842
↑ Alahari A, Saint N, Campagna S, Molle V, Molle G, Kremer L. The N-terminal domain of OmpATb is required for membrane translocation and pore-forming activity in mycobacteria. J Bacteriol. 2007 Sep;189(17):6351-8. doi: 10.1128/JB.00509-07. Epub 2007 Jun 15. PMID:17573469 doi:http://dx.doi.org/10.1128/JB.00509-07
↑ Song H, Huff J, Janik K, Walter K, Keller C, Ehlers S, Bossmann SH, Niederweis M. Expression of the ompATb operon accelerates ammonia secretion and adaptation of Mycobacterium tuberculosis to acidic environments. Mol Microbiol. 2011 May;80(4):900-18. doi: 10.1111/j.1365-2958.2011.07619.x. Epub, 2011 Mar 16. PMID:21410778 doi:http://dx.doi.org/10.1111/j.1365-2958.2011.07619.x
↑ Yang Y, Auguin D, Delbecq S, Dumas E, Molle G, Molle V, Roumestand C, Saint N. Structure of the Mycobacterium tuberculosis OmpATb protein: A model of an oligomeric channel in the mycobacterial cell wall. Proteins. 2010 Oct 12. PMID:21117233 doi:10.1002/prot.22912

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/2kgs"

@@ Line 1: / Line 1: @@
 ==Solution structure of the amino-terminal domain of OmpATb, a pore forming protein from Mycobacterium tuberculosis==
-<StructureSection load='2kgs' size='340' side='right'caption='[[2kgs]], [[NMR_Ensembles_of_Models | 10 NMR models]]' scene=''>
+<StructureSection load='2kgs' size='340' side='right'caption='[[2kgs]]' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[2kgs]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/"bacillus_tuberculosis"_(zopf_1883)_klein_1884 "bacillus tuberculosis" (zopf 1883) klein 1884]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2KGS OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2KGS FirstGlance]. <br>
+<table><tr><td colspan='2'>[[2kgs]] 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=2KGS OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2KGS FirstGlance]. <br>
-</td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[2kgw|2kgw]]</div></td></tr>
+</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</td></tr>
-<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">Rv0899, MT0922, MTCY31.27 ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1773 "Bacillus tuberculosis" (Zopf 1883) Klein 1884])</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=2kgs FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2kgs OCA], [https://pdbe.org/2kgs PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2kgs RCSB], [https://www.ebi.ac.uk/pdbsum/2kgs PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2kgs 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 ==
@@ Line 22: / Line 23: @@
 </StructureSection>
 [[Category: Large Structures]]
-[[Category: Auguin, D]]
-[[Category: Delbecq, S]]
-[[Category: Dumas, E]]
-[[Category: Molle, V]]
-[[Category: Saint, N]]
-[[Category: Yang, Y]]
-[[Category: Bon domain]]
-[[Category: Cell membrane]]
-[[Category: Membrane]]
-[[Category: Membrane protein]]
 [[Category: Mycobacterium tuberculosis]]
-[[Category: Outer membrane protein some]]
+[[Category: Auguin D]]
-[[Category: Transmembrane]]
+[[Category: Delbecq S]]
+[[Category: Dumas E]]
+[[Category: Molle V]]
+[[Category: Saint N]]
+[[Category: Yang Y]]

2kgs

From Proteopedia

Revision as of 10:27, 6 September 2023

Solution structure of the amino-terminal domain of OmpATb, a pore forming protein from Mycobacterium tuberculosis

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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