5unm

LarE, a sulfur transferase involved in synthesis of the cofactor for lactate racemase, substrate free form with flexible loop

spinqualitylabelsall models 5unm, resolution 2.58Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5unm is a 6 chain structure with sequence from "lactobacillus_arabinosus"_fred_et_al. "lactobacillus arabinosus" fred et al.. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: PO4 Gene: A8P51_04975, IV39_GL000116, LPJSA22_00116, Nizo1839_0768, Nizo2891_3302, SRCM101060_01452 ("Lactobacillus arabinosus" Fred et al.) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The lar operon in Lactobacillus plantarum encodes five Lar proteins (LarA/B/C/D/E) that collaboratively synthesize and incorporate a niacin-derived Ni-containing cofactor into LarA, an Ni-dependent lactate racemase. Previous studies have established that two molecules of LarE catalyze successive thiolation reactions by donating the sulfur atom of their exclusive cysteine residues to the substrate. However, the catalytic mechanism of this very unusual sulfur-sacrificing reaction remains elusive. In this work, we present the crystal structures of LarE in ligand-free and several ligand-bound forms, demonstrating that LarE is a member of the N-type ATP pyrophosphatase (PPase) family with a conserved N-terminal ATP PPase domain and a unique C-terminal domain harboring the putative catalytic site. Structural analysis, combined with structure-guided mutagenesis, leads us to propose a catalytic mechanism that establishes LarE as a paradigm for sulfur transfer through sacrificing its catalytic cysteine residue. Structural insights into the catalytic mechanism of a sacrificial sulfur insertase of the N-type ATP pyrophosphatase family, LarE.,Fellner M, Desguin B, Hausinger RP, Hu J Proc Natl Acad Sci U S A. 2017 Aug 22;114(34):9074-9079. doi:, 10.1073/pnas.1704967114. Epub 2017 Aug 7. PMID:28784764 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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