6utq
From Proteopedia
LarE, a sulfur transferase involved in synthesis of the cofactor for lactate racemase in complex with cadmium
Structural highlights
FunctionLARE_LACPL Involved in the biosynthesis of a nickel-pincer cofactor ((SCS)Ni(II) pincer complex). Catalyzes the ATP-dependent incorporation of two sulfur atoms in pyridinium-3,5-biscarboxylic acid mononucleotide (P2CMN) to yield pyridinium-3,5-bisthiocarboxylic acid mononucleotide (P2TMN). The source of sulfur is the enzyme itself: Cys-176 of LarE is the sulfur donor, thereby being converted into dehydroalanine, and is not regenerated in vivo. Thus, two molecules of LarE undergo sacrificial sulfur transfer to create one P2TMN (PubMed:27114550). Binds nickel (PubMed:24710389). Is required for the activation of the lactate racemase LarA (PubMed:24710389). May also be involved in the activation of other nickel-pincer cofactor-dependent enzymes (PubMed:27114550).[1] [2] Publication Abstract from PubMedDetailed crystallographic characterization of a tri-aspartate metal-binding site previously identified on the three-fold symmetry axis of a hexameric enzyme, LarE from Lactobacillus plantarum, was conducted. By screening an array of monovalent, divalent, and trivalent metal ions, we demonstrated that this metal binding site stoichiometrically binds Ca(2+), Mn(2+), Fe(2+)/Fe(3+), Co(2+), Ni(2+), Cu(2+), Zn(2+), and Cd(2+), but not monovalent metal ions, Cr(3+), Mg(2+), Y(3+), Sr(2+) or Ba(2+). Extensive database searches resulted in only 13 similar metal binding sites in other proteins, indicative of the rareness of tri-aspartate architectures, which allows for engineering such a selective multivalent metal ion binding site into target macromolecules for structural and biophysical characterization. Crystallographic characterization of a tri-Asp metal-binding site at the three-fold symmetry axis of LarE.,Fellner M, Huizenga KG, Hausinger RP, Hu J Sci Rep. 2020 Apr 2;10(1):5830. doi: 10.1038/s41598-020-62847-6. PMID:32242052[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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