1efa | pdb_00001efa

CRYSTAL STRUCTURE OF THE LAC REPRESSOR DIMER BOUND TO OPERATOR AND THE ANTI-INDUCER ONPF

spinqualitylabelsall models 1efa, resolution 2.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1efa is a 5 chain structure with sequence from "bacillus_coli"_migula_1895 "bacillus coli" migula 1895. The March 2003 RCSB PDB Molecule of the Month feature on lac Repressor by David S. Goodsell is 10.2210/rcsb_pdb/mom_2003_3. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: NPF Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [LACI_ECOLI] Repressor of the lactose operon. Binds allolactose as an inducer. 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 Crystal structures of the Lac repressor, with and without isopropyithiogalactoside (IPTG), and the repressor bound to operator have provided a model for how the binding of the inducer reduces the affinity of the repressor for the operator. However, because of the low resolution of the operator-bound structure (4.8 A), the model for the allosteric transition was presented in terms of structural elements rather than in terms of side chain interactions. Here we have constructed a dimeric Lac repressor and determined its structure at 2.6 A resolution in complex with a symmetric operator and the anti-inducer orthonitrophenylfucoside (ONPF). The structure enables the induced (IPTG-bound) and repressed (operator-bound) conformations of the repressor to be compared in atomic detail. An extensive network of interactions between the DNA-binding and core domains of the repressor suggests a possible mechanism for the allosteric transition. A closer view of the conformation of the Lac repressor bound to operator.,Bell CE, Lewis M Nat Struct Biol. 2000 Mar;7(3):209-14. PMID:10700279 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Lac repressor

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