Structure and Functional Analysis of LptC, a Conserved Membrane Protein Involved in the Lipopolysaccharide Export Pathway in Escherichia coli

Tran, Am X., Dong, Changjiang and Whitfield, Chris (2010) Structure and Functional Analysis of LptC, a Conserved Membrane Protein Involved in the Lipopolysaccharide Export Pathway in Escherichia coli. Journal of Biological Chemistry, 285 (43). pp. 33529-33539. ISSN 0021-9258

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Abstract

LptC is a conserved bitopic inner membrane protein from Escherichia coli involved in the export of lipopolysaccharide from its site of synthesis in the cytoplasmic membrane to the outer membrane. LptC forms a complex with the ATP-binding cassette transporter, LptBFG, which is thought to facilitate the extraction of lipopolysaccharide from the inner membrane and release it into a translocation pathway that includes the putative periplasmic chaperone LptA. Cysteine modification experiments established that the catalytic domain of LptC is oriented toward the periplasm. The structure of the periplasmic domain is described at a resolution of 2.2-Å from x-ray crystallographic data. The periplasmic domain of LptC consists of a twisted boat structure with two ß-sheets in apposition to each other. The ß-sheets contain seven and eight antiparallel ß-strands, respectively. This structure bears a high degree of resemblance to the crystal structure of LptA. Like LptA, LptC binds lipopolysaccharide in vitro. In vitro, LptA can displace lipopolysaccharide from LptC (but not vice versa), consistent with their locations and their proposed placement in a unidirectional export pathway.

Item Type: Article
Uncontrolled Keywords: bacteria,cell surface,crystal structure,endotoxin,lipopolysaccharide (lps),membrane biogenesis,membrane proteins,membrane trafficking,lps export,lpt proteins
Faculty \ School: Faculty of Medicine and Health Sciences > Norwich Medical School
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Depositing User: Rhiannon Harvey
Date Deposited: 22 Feb 2012 10:04
Last Modified: 21 Apr 2020 16:58
URI: https://ueaeprints.uea.ac.uk/id/eprint/37345
DOI: 10.1074/jbc.M110.144709

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