3pc3

Full length structure of cystathionine beta-synthase from Drosophila in complex with aminoacrylate

spinqualitylabelsall models 3pc3, resolution 1.55Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3pc3 is a 1 chain structure with sequence from Drosophila melanogaster. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.55Å Ligands: HEM, P1T Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q9VRD9_DROME Publication Abstract from PubMed The catalytic potential for H(2)S biogenesis and homocysteine clearance converge at the active site of cystathionine beta-synthase (CBS), a pyridoxal phosphate-dependent enzyme. CBS catalyzes beta-replacement reactions of either serine or cysteine by homocysteine to give cystathionine and water or H(2)S, respectively. In this study, high-resolution structures of the full-length enzyme from Drosophila in which a carbanion (1.70 A) and an aminoacrylate intermediate (1.55 A) have been captured are reported. Electrostatic stabilization of the zwitterionic carbanion intermediate is afforded by the close positioning of an active site lysine residue that is initially used for Schiff base formation in the internal aldimine and later as a general base. Additional stabilizing interactions between active site residues and the catalytic intermediates are observed. Furthermore, the structure of the regulatory "energy-sensing" CBS domains, named after this protein, suggests a mechanism for allosteric activation by S-adenosylmethionine. Structural basis for substrate activation and regulation by cystathionine beta-synthase (CBS) domains in cystathionine {beta}-synthase.,Koutmos M, Kabil O, Smith JL, Banerjee R Proc Natl Acad Sci U S A. 2010 Nov 16. PMID:21081698 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Cystathionine β-synthase 3D structures

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