5xub | pdb_00005xub

The citrate-bound trimer of chemoreceptor MCP2201 ligand binding domain

spinqualitylabelsall models 5xub, resolution 2.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5xub is a 2 chain structure with sequence from Comt2. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CIT Gene: CtCNB1_2201 (COMT2) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Transmembrane chemoreceptors are widely present in Bacteria and Archaea. They play a critical role in sensing various signals outside and transmitting to the cell interior. Here, we report the structure of the periplasmic ligand-binding domain (LBD) of the transmembrane chemoreceptor MCP2201, which governs chemotaxis to citrate and other organic compounds in Comamonas testosteroni. The apo-form LBD crystal revealed a typical four-helix bundle homodimer, similar to previously well-studied chemoreceptors such as Tar and Tsr of Escherichia coli. However, the citrate-bound LBD revealed a four-helix bundle homotrimer that had not been observed in bacterial chemoreceptor LBDs. This homotrimer was further confirmed with size-exclusion chromatography, analytical ultracentrifugation and cross-linking experiments. The physiological importance of the homotrimer for chemotaxis was demonstrated with site-directed mutations of key amino acid residues in C. testosteroni mutants. The ligand-binding domain of a chemoreceptor from Comamonas testosteroni has a previously unknown homotrimeric structure.,Hong Y, Huang Z, Guo L, Ni B, Jiang CY, Li XJ, Hou YJ, Yang WS, Wang DC, Zhulin IB, Liu SJ, Li DF Mol Microbiol. 2019 Jun 8. doi: 10.1111/mmi.14326. PMID:31177588 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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