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• W2023278485 abstract "Pseudomonas aeruginosa is an opportunistic pathogen and one of the major model organisms for the study of chemotaxis. The bacterium harbours 26 genes encoding chemoreceptors, most of which have not been annotated with a function. The paralogous chemoreceptors PctA and PctB (Pseudomonas chemotactic transducer A and B) were found to mediate chemotaxis towards l-amino acids. However, the ligand spectrum of the receptors is quite different since the recombinant ligand-binding region (LBR) of PctA binds 17 different l-­amino acids whereas that of PctB recognizes only five. To determine the molecular basis underlying this ligand specificity, PctA-LBR and PctB-LBR have been purified and crystals have been produced after pre-incubation with l-­Ile and l-Arg, respectively. Initial crystallization conditions have been identified by the counter-diffusion method and X-ray data have been collected at 2.5 Å (PctA-LBR bound to l-Ile) and 3.14 Å (PctB-LBR bound to l-Arg) resolution. Crystals belonged to space groups P212121 and P3121, with unit-cell parameters a = 72.2, b = 78.5, c = 116.6 Å and a = b = 111.6, c = 117.4, respectively, for PctA-LBR and PctB-LBR. Molecular-replacement methods will be pursued for structural determination." @default.
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• W2023278485 date "2013-11-29" @default.
• W2023278485 modified "2023-10-17" @default.
• W2023278485 title "Purification, crystallization and preliminary crystallographic analysis of the ligand-binding regions of the PctA and PctB chemoreceptors from<i>Pseudomonas aeruginosa</i>in complex with amino acids" @default.
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• W2023278485 doi "https://doi.org/10.1107/s1744309113023592" @default.
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