2w7q

Structure of Pseudomonas aeruginosa LolA

spinqualitylabelsall models 2w7q, resolution 1.88Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2w7q is a 2 chain structure with sequence from Pseudomonas aeruginosa PAO1. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.88Å Ligands: GOL Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function LOLA_PSEAE Participates in the translocation of lipoproteins from the inner membrane to the outer membrane. Only forms a complex with a lipoprotein if the residue after the N-terminal Cys is not an aspartate (The Asp acts as a targeting signal to indicate that the lipoprotein should stay in the inner membrane).[HAMAP-Rule:MF_00240] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Many lipoproteins reside in the outer membrane (OM) of Gram-negative bacteria, and their biogenesis is dependent on the Lol (localization of lipoproteins) system. The periplasmic chaperone LolA accepts OM-destined lipoproteins that are released from the inner membrane by the LolCDE complex and transfers them to the OM receptor LolB. The exact nature of the LolA-lipoprotein complex is still unknown. The crystal structure of Escherichia coli LolA features an open beta-barrel covered by alpha helices that together constitute a hydrophobic cavity, which would allow the binding of one acyl chain. However, OM lipoproteins contain three acyl chains, and the stoichiometry of the LolA-lipoprotein complex is 1:1. Here we present the crystal structure of Pseudomonas aeruginosa LolA that projects clear hydrophobic surface patches. Since these patches are large enough to accommodate acyl chains, their role in lipoprotein binding was investigated. Several LolA mutant proteins were created, and their functionality was assessed by studying their capacity to release lipoproteins produced in sphaeroplasts. Interruption of the largest hydrophobic patch completely destroyed the lipoprotein-releasing capacity of LolA, while interruption of smaller patches apparently reduced efficiency. Thus, the results show a new lipoprotein transport model that places (some of) the acyl chains on the hydrophobic surface patches. Hydrophobic surface patches on LolA of Pseudomonas aeruginosa are essential for lipoprotein binding.,Remans K, Pauwels K, van Ulsen P, Buts L, Cornelis P, Tommassen J, Savvides SN, Decanniere K, Van Gelder P J Mol Biol. 2010 Sep 3;401(5):921-30. Epub 2010 Jul 8. PMID:20620146 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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