1dv1

STRUCTURE OF BIOTIN CARBOXYLASE (APO)

spinqualitylabelsall models 1dv1, resolution 1.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1dv1 is a 2 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.9Å Ligands: PO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function ACCC_ECOLI This protein is a component of the acetyl coenzyme A carboxylase complex; first, biotin carboxylase catalyzes the carboxylation of the carrier protein and then the transcarboxylase transfers the carboxyl group to form malonyl-CoA. 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 Acetyl-CoA carboxylase catalyzes the first committed step in fatty acid synthesis. In Escherichia coli, the enzyme is composed of three distinct protein components: biotin carboxylase, biotin carboxyl carrier protein, and carboxyltransferase. The biotin carboxylase component has served for many years as a paradigm for mechanistic studies devoted toward understanding more complicated biotin-dependent carboxylases. The three-dimensional x-ray structure of an unliganded form of E. coli biotin carboxylase was originally solved in 1994 to 2.4-A resolution. This study revealed the architecture of the enzyme and demonstrated that the protein belongs to the ATP-grasp superfamily. Here we describe the three-dimensional structure of the E. coli biotin carboxylase complexed with ATP and determined to 2.5-A resolution. The major conformational change that occurs upon nucleotide binding is a rotation of approximately 45(o) of one domain relative to the other domains thereby closing off the active site pocket. Key residues involved in binding the nucleotide to the protein include Lys-116, His-236, and Glu-201. The backbone amide groups of Gly-165 and Gly-166 participate in hydrogen bonding interactions with the phosphoryl oxygens of the nucleotide. A comparison of this closed form of biotin carboxylase with carbamoyl-phosphate synthetase is presented. Movement of the biotin carboxylase B-domain as a result of ATP binding.,Thoden JB, Blanchard CZ, Holden HM, Waldrop GL J Biol Chem. 2000 May 26;275(21):16183-90. PMID:10821865 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Acetyl-CoA carboxylase 3D structures

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