1ls3 | pdb_00001ls3

Crystal Structure of the Complex between Rabbit Cytosolic Serine Hydroxymethyltransferase and TriGlu-5-formyl-tetrahydrofolate

spinqualitylabelsall models 1ls3, resolution 2.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1ls3 is a 4 chain structure with sequence from Oryctolagus cuniculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: GLY, GOL, PLP, TGF Related: 1cj0, 1dfo, 1eji, 1kl2 Activity: Glycine hydroxymethyltransferase, with EC number 2.1.2.1 Resources: FirstGlance, OCA, RCSB, PDBsum 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 Serine hydroxymethyltransferase (SHMT; EC 2.1.2.1) catalyzes the reversible interconversion of serine and glycine with transfer of the serine side chain one-carbon group to tetrahydropteroylglutamate (H(4)PteGlu), and also the conversion of 5,10-methenyl-H(4)PteGlu to 5-formyl-H(4)PteGlu. In the cell, H(4)PteGlu carries a poly-gamma-glutamyl tail of at least 3 glutamyl residues that is required for physiological activity. This study combines solution binding and mutagenesis studies with crystallographic structure determination to identify the extended binding site for tetrahydropteroylpolyglutamate on rabbit cytosolic SHMT. Equilibrium binding and kinetic measurements of H(4)PteGlu(3) and H(4)PteGlu(5) with wild-type and Lys --> Gln or Glu site mutant homotetrameric rabbit cytosolic SHMTs identified lysine residues that contribute to the binding of the polyglutamate tail. The crystal structure of the enzyme in complex with 5-formyl-H(4)PteGlu(3) confirms the solution data and indicates that the conformation of the pteridine ring and its interactions with the enzyme differ slightly from those observed in complexes of the monoglutamate cofactor. The polyglutamate chain, which does not contribute to catalysis, exists in multiple conformations in each of the two occupied binding sites and appears to be bound by the electrostatic field created by the cationic residues, with only limited interactions with specific individual residues. Location of the pteroylpolyglutamate-binding site on rabbit cytosolic serine hydroxymethyltransferase.,Fu TF, Scarsdale JN, Kazanina G, Schirch V, Wright HT J Biol Chem. 2003 Jan 24;278(4):2645-53. Epub 2002 Nov 15. PMID:12438316 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Serine hydroxymethyltransferase

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