3vx4

Crystal Structure of the Nucleotide-Binding Domain of S. mutans ComA, a Bifunctional ATP-binding Cassette Transporter Involved in the Quorum-sensing Pathway

spinqualitylabelsall models 3vx4, resolution 2.69Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3vx4 is a 2 chain structure with sequence from Streptococcus mutans UA159. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.69Å Ligands: ATP, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q8DW05_STRMU Publication Abstract from PubMed The ATP-binding cassette (ABC) transporter ComA is a key molecule essential for the first step of the quorum-sensing system of Streptococcus. The nucleotide binding domains (NBD) of Streptococcus mutans ComA with different N termini, NBD1 (amino acid residues 495-760), NBD2 (517-760), and NBD3 (528-760), were expressed, purified, and characterized. The shortest NBD3 corresponds to the region commonly defined as NBD in the database searches of ABC transporters. A kinetic analysis showed that the extra N-terminal region conferred a significantly higher ATP hydrolytic activity on the NBD at a neutral pH. Gel-filtration, X-ray crystallography, and mutational analyses suggest that at least four to five residues beyond the N-terminal boundary of NBD3 indeed participate in stabilizing the protein scaffold of the domain structure, thereby facilitating the ATP-dependent dimerization of NBD which is a prerequisite to the catalysis. These findings, together with the presence of a highly conserved glycine residue in this region, support the redefinition of the N-terminal boundary of the NBD of these types of ABC exporters. Boundary of the Nucleotide-Binding Domain of Streptococcus ComA Based on Functional and Structural Analysis.,Ishii S, Yano T, Okamoto A, Murakawa T, Hayashi H Biochemistry. 2013 Apr 16;52(15):2545-55. doi: 10.1021/bi3017069. Epub 2013 Apr, 5. PMID:23534432 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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