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6mi8

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Revision as of 07:57, 10 April 2019

Cryo-EM Structure of vanadate-trapped E.coli LptB2FGC

Structural highlights

6mi8 is a 4 chain structure with sequence from Ecoli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
Related:	6mi7
Gene:	lptB, yhbG, b3201, JW3168 (ECOLI), lptF, yjgP, b4261, JW4218 (ECOLI), lptG, yjgQ, b4262, JW5760 (ECOLI)
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[LPTB_ECOLI] Part of the ABC transporter complex LptBFG involved in the translocation of lipopolysaccharide (LPS) from the inner membrane to the outer membrane. Probably responsible for energy coupling to the transport system.^[1] ^[2] ^[3] [LPTG_ECOLI] Part of the ABC transporter complex LptBFG involved in the translocation of lipopolysaccharide (LPS) from the inner membrane to the outer membrane.^[4] [LPTF_ECOLI] Part of the ABC transporter complex LptBFG involved in the translocation of lipopolysaccharide (LPS) from the inner membrane to the outer membrane.^[5]

Publication Abstract from PubMed

In Gram-negative bacteria, lipopolysaccharide is essential for outer membrane formation and antibiotic resistance. The seven lipopolysaccharide transport (Lpt) proteins A-G move lipopolysaccharide from the inner to the outer membrane. The ATP-binding cassette transporter LptB2FG, which tightly associates with LptC, extracts lipopolysaccharide out of the inner membrane. The mechanism of the LptB2FG-LptC complex (LptB2FGC) and the role of LptC in lipopolysaccharide transport are poorly understood. Here we characterize the structures of LptB2FG and LptB2FGC in nucleotide-free and vanadate-trapped states, using single-particle cryo-electron microscopy. These structures resolve the bound lipopolysaccharide, reveal transporter-lipopolysaccharide interactions with side-chain details and uncover how the capture and extrusion of lipopolysaccharide are coupled to conformational rearrangements of LptB2FGC. LptC inserts its transmembrane helix between the two transmembrane domains of LptB2FG, which represents a previously unknown regulatory mechanism for ATP-binding cassette transporters. Our results suggest a role for LptC in achieving efficient lipopolysaccharide transport, by coordinating the action of LptB2FG in the inner membrane and Lpt protein interactions in the periplasm.

Structural basis of lipopolysaccharide extraction by the LptB2FGC complex.,Li Y, Orlando BJ, Liao M Nature. 2019 Mar;567(7749):486-490. doi: 10.1038/s41586-019-1025-6. Epub 2019 Mar, 20. PMID:30894744^[6]

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

References

↑ Sperandeo P, Pozzi C, Deho G, Polissi A. Non-essential KDO biosynthesis and new essential cell envelope biogenesis genes in the Escherichia coli yrbG-yhbG locus. Res Microbiol. 2006 Jul-Aug;157(6):547-58. Epub 2006 Feb 9. PMID:16765569 doi:10.1016/j.resmic.2005.11.014
↑ Sperandeo P, Cescutti R, Villa R, Di Benedetto C, Candia D, Deho G, Polissi A. Characterization of lptA and lptB, two essential genes implicated in lipopolysaccharide transport to the outer membrane of Escherichia coli. J Bacteriol. 2007 Jan;189(1):244-53. Epub 2006 Oct 20. PMID:17056748 doi:http://dx.doi.org/10.1128/JB.01126-06
↑ Sperandeo P, Lau FK, Carpentieri A, De Castro C, Molinaro A, Deho G, Silhavy TJ, Polissi A. Functional analysis of the protein machinery required for transport of lipopolysaccharide to the outer membrane of Escherichia coli. J Bacteriol. 2008 Jul;190(13):4460-9. Epub 2008 Apr 18. PMID:18424520 doi:JB.00270-08
↑ Ruiz N, Gronenberg LS, Kahne D, Silhavy TJ. Identification of two inner-membrane proteins required for the transport of lipopolysaccharide to the outer membrane of Escherichia coli. Proc Natl Acad Sci U S A. 2008 Apr 8;105(14):5537-42. doi:, 10.1073/pnas.0801196105. Epub 2008 Mar 28. PMID:18375759 doi:http://dx.doi.org/10.1073/pnas.0801196105
↑ Ruiz N, Gronenberg LS, Kahne D, Silhavy TJ. Identification of two inner-membrane proteins required for the transport of lipopolysaccharide to the outer membrane of Escherichia coli. Proc Natl Acad Sci U S A. 2008 Apr 8;105(14):5537-42. doi:, 10.1073/pnas.0801196105. Epub 2008 Mar 28. PMID:18375759 doi:http://dx.doi.org/10.1073/pnas.0801196105
↑ Li Y, Orlando BJ, Liao M. Structural basis of lipopolysaccharide extraction by the LptB2FGC complex. Nature. 2019 Mar;567(7749):486-490. doi: 10.1038/s41586-019-1025-6. Epub 2019 Mar, 20. PMID:30894744 doi:http://dx.doi.org/10.1038/s41586-019-1025-6

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/6mi8"

@@ Line 3: / Line 3: @@
 <StructureSection load='6mi8' size='340' side='right'caption='[[6mi8]], [[Resolution|resolution]] 4.30&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[6mi8]] is a 4 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6MI8 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6MI8 FirstGlance]. <br>
+<table><tr><td colspan='2'>[[6mi8]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/Ecoli Ecoli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6MI8 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6MI8 FirstGlance]. <br>
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=AOV:ADP+ORTHOVANADATE'>AOV</scene></td></tr>
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[6mi7|6mi7]]</td></tr>
+<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">lptB, yhbG, b3201, JW3168 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=83333 ECOLI]), lptF, yjgP, b4261, JW4218 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=83333 ECOLI]), lptG, yjgQ, b4262, JW5760 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=83333 ECOLI])</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=6mi8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6mi8 OCA], [http://pdbe.org/6mi8 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6mi8 RCSB], [http://www.ebi.ac.uk/pdbsum/6mi8 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6mi8 ProSAT]</span></td></tr>
 </table>
@@ Line 23: / Line 24: @@
 __TOC__
 </StructureSection>
+[[Category: Ecoli]]
 [[Category: Large Structures]]
 [[Category: Li, Y]]

6mi8

From Proteopedia

Revision as of 07:57, 10 April 2019

Cryo-EM Structure of vanadate-trapped E.coli LptB2FGC

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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