4bg4 | pdb_00004bg4

Crystal structure of Litopenaeus vannamei arginine kinase in a ternary analog complex with arginine, ADP-Mg and NO3

Loading... Status: waiting for Mol* initialization Structural highlights 4bg4 is a 2 chain structure with sequence from Penaeus vannamei. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.601Å Ligands: ADP, ARG, BME, CSO, MG, NO3 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function KARG0_PENVA Catalyzes the reversible transfer of high energy ATP gamma-phosphate group to L-arginine (PubMed:17496423, PubMed:27072556, PubMed:22750864, PubMed:23873077). Has nucleoside diphosphate kinase-like activity toward dTDP. Binds and phosphorylates dTDP using ATP as a phosphate donor. Does not phosphorylate dADP, dCDP, dGDP, dTMP or thymidine (PubMed:27072556). Publication Abstract from PubMed Arginine kinase (AK) is a key enzyme for energetic balance in invertebrates. Although AK is a well-studied system that provides fast energy to invertebrates using the phosphagen phospho-arginine, the structural details on the AK-arginine binary complex interaction remain unclear. Herein, we determined two crystal structures of the Pacific whiteleg shrimp (Litopenaeus vannamei) arginine kinase, one in binary complex with arginine (LvAK-Arg) and a ternary transition state analog complex (TSAC). We found that the arginine guanidinium group makes ionic contacts with Glu225, Cys271 and a network of ordered water molecules. On the zwitterionic side of the amino acid, the backbone amide nitrogens of Gly64 and Val65 coordinate the arginine carboxylate. Glu314, one of proposed acid-base catalytic residues, did not interact with arginine in the binary complex. This residue is located in the flexible loop 310-320 that covers the active site and only stabilizes in the LvAK-TSAC. This is the first binary complex crystal structure of a guanidine kinase in complex with the guanidine substrate and could give insights into the nature of the early steps of phosphagen biosynthesis. Crystal structure of shrimp arginine kinase in binary complex with arginine-a molecular view of the phosphagen precursor binding to the enzyme.,Lopez-Zavala AA, Garcia-Orozco KD, Carrasco-Miranda JS, Sugich-Miranda R, Velazquez-Contreras EF, Criscitiello MF, Brieba LG, Rudino-Pinera E, Sotelo-Mundo RR J Bioenerg Biomembr. 2013 Jul 20. PMID:23873077 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Arginine kinase 3D structures

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