1cma | pdb_00001cma

MET REPRESSOR/DNA COMPLEX + S-ADENOSYL-METHIONINE

spinqualitylabelsall models 1cma, resolution 2.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1cma is a 4 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: SAM Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum Function [METJ_ECOLI] This regulatory protein, when combined with SAM (S-adenosylmethionine) represses the expression of the methionine regulon and of enzymes involved in SAM synthesis. It is also autoregulated.[HAMAP-Rule:MF_00744] 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 The crystal structure of the met repressor-operator complex shows two dimeric repressor molecules bound to adjacent sites 8 base pairs apart on an 18-base-pair DNA fragment. Sequence specificity is achieved by insertion of double-stranded antiparallel protein beta-ribbons into the major groove of B-form DNA, with direct hydrogen-bonding between amino-acid side chains and the base pairs. The repressor also recognizes sequence-dependent distortion or flexibility of the operator phosphate backbone, conferring specificity even for inaccessible base pairs. Crystal structure of the met repressor-operator complex at 2.8 A resolution reveals DNA recognition by beta-strands.,Somers WS, Phillips SE Nature. 1992 Oct 1;359(6394):387-93. PMID:1406951 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Joe Granger Methionine Repressor: Escherichia coli Met repressor Taylor met repressor

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