5b1i

Crystal structure of K42A mutant of cystathionine beta-synthase from Lactobacillus plantarum in a complex with L-methionine

spinqualitylabelsall models 5b1i, resolution 3.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5b1i is a 8 chain structure with sequence from Lactiplantibacillus plantarum WCFS1. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: AA5, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function F9UT54_LACPL Publication Abstract from PubMed Cystathionine beta-synthase (CBS) catalyzes the formation of l-cystathionine from l-serine and l-homocysteine. The resulting l-cystathionine is decomposed into l-cysteine, ammonia, and alpha-ketobutylic acid by cystathionine gamma-lyase (CGL). This reverse transsulfuration pathway, which is catalyzed by both enzymes, mainly occurs in eukaryotic cells. The eukaryotic CBS and CGL have recently been recognized as major physiological enzymes for the generation of hydrogen sulfide (H2 S). In some bacteria, including the plant-derived lactic acid bacterium Lactobacillus plantarum, the CBS- and CGL-encoding genes form a cluster in their genomes. Inactivation of these enzymes has been reported to suppress H2 S production in bacteria; interestingly, it has been shown that H2 S suppression increases their susceptibility to various antibiotics. In the present study, we characterized the enzymatic properties of the L. plantarum CBS, whose amino acid sequence displays a similarity with those of O-acetyl-l-serine sulfhydrylase (OASS) that catalyzes the generation of l-cysteine from O-acetyl-l-serine (l-OAS) and H2 S. The L. plantarum CBS shows l-OAS- and l-cysteine-dependent CBS activities together with OASS activity. Especially, it catalyzes the formation of H2 S in the presence of l-cysteine and l-homocysteine, together with the formation of l-cystathionine. The high affinity toward l-cysteine as a first substrate and tendency to use l-homocysteine as a second substrate might be associated with its enzymatic ability to generate H2 S. Crystallographic and mutational analyses of CBS indicate that the Ala70 and Glu223 residues at the substrate binding pocket are important for the H2 S-generating activity. Crystallographic and mutational analyses of cystathionine beta-synthase in the H2 S-synthetic gene cluster in Lactobacillus plantarum.,Matoba Y, Yoshida T, Izuhara-Kihara H, Noda M, Sugiyama M Protein Sci. 2017 Jan 27. doi: 10.1002/pro.3123. PMID:28127810 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Cystathionine β-synthase 3D structures

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