6ccz | pdb_00006ccz

Crystal structure of Medicago truncatula serine hydroxymethyltransferase 3 (MtSHMT3) soaked with selenourea

spinqualitylabelsall models 6ccz, resolution 2.14Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6ccz is a 2 chain structure with sequence from Barrel medic. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ACT, FMT, SEY NonStd Res: LLP Gene: 11445860, MTR_2g018290 (Barrel medic) Activity: Glycine hydroxymethyltransferase, with EC number 2.1.2.1 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [G7ILW0_MEDTR] Interconversion of serine and glycine.[RuleBase:RU000585] Publication Abstract from PubMed Serine hydroxymethyltransferase (SHMT, EC 2.1.2.1) is a pyridoxal 5'-phosphate (PLP)-dependent enzyme which catalyzes the reversible serine-to-glycine conversion in either a tetrahydrofolate-dependent or -independent manner. The enzyme is also responsible for the tetrahydrofolate-independent cleavage of other beta-hydroxy amino acids. In addition to being an essential player in the serine homeostasis, SHMT action is the main source of activated one-carbon units, which links SHMT activity with the control of cell proliferation. In plants, studies of SHMT enzymes are more complicated than of those of, e.g., bacterial or mammalian origins because plant genomes encode multiple SHMT isozymes that are targeted to different subcellular compartments: cytosol, mitochondria, plastids, and nucleus. Here we report crystal structures of chloroplast-targeted SHMT from Medicago truncatula (MtSHMT3). MtSHMT3 is a tetramer in solution, composed of two tight and obligate dimers. Our complexes with PLP internal aldimine, PLP-serine and PLP-glycine external aldimines, and PLP internal aldimine with a free glycine reveal structural details of the MtSHMT3-catalyzed reaction. Capturing the enzyme in different stages along the course of the slow tetrahydrofolate-independent serine-to-glycine conversion allowed to observe a unique conformation of the PLP-serine gamma-hydroxyl group, and a concerted movement of two tyrosine residues in the active site. Chloroplastic Serine Hydroxymethyltransferase From Medicago truncatula: A Structural Characterization.,Ruszkowski M, Sekula B, Ruszkowska A, Dauter Z Front Plant Sci. 2018 May 11;9:584. doi: 10.3389/fpls.2018.00584. eCollection, 2018. PMID:29868052 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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