4hzc

Crystal structure of Serine acetyltransferase from Brucella abortus strain S19

spinqualitylabelsall models 4hzc, resolution 1.97Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4hzc is a 12 chain structure with sequence from Brua1. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: 15P, CL, MG, TRS Related: 4hzd, 3mc4, 3p1b, 1ssq, 1t3d Gene: BAbS19_I11940, CysE (BRUA1) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Brucella abortus is the major cause of premature foetal abortion in cattle, can be transmitted from cattle to humans, and is considered a powerful biological weapon. De novo cysteine biosynthesis is one of the essential pathways reported in bacteria, protozoa, and plants. Serine acetyltransferase (SAT) initiates this reaction by catalyzing the formation of O-acetylserine (OAS) using l-serine and acetyl coenzyme A as substrates. Here we report kinetic and crystallographic studies of this enzyme from B. abortus. The kinetic studies indicate that cysteine competitively inhibits the binding of serine to B. abortus SAT (BaSAT) and noncompetitively inhibits the binding of acetyl coenzyme A. The crystal structures of BaSAT in its apo state and in complex with coenzyme A (CoA) were determined to 1.96A and 1.87A resolution, respectively. BaSAT was observed as a trimer in a size exclusion column; however, it was seen as a hexamer in dynamic light scattering (DLS) studies and in the crystal structure, indicating it may exist in both states. The complex structure shows coenzyme A bound to the C-terminal region, making mostly hydrophobic contacts from the center of the active site extending up to the surface of the protein. There is no conformational difference in the enzyme between the apo and the complexed states, indicating lock and key binding and the absence of an induced fit mechanism. Crystal structure of serine acetyl transferase from Brucella abortus and its complex with coenzyme A.,Kumar S, Kumar N, Alam N, Gourinath S Biochim Biophys Acta. 2014 Jul 22;1844(10):1741-1748. doi:, 10.1016/j.bbapap.2014.07.009. PMID:25058332 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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