4bg4 | pdb_00004bg4

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

spinqualitylabelsall models 4bg4, resolution 1.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4bg4 is a 2 chain structure with sequence from Litopenaeus vannamei. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ADP, ARG, BME, MG, NO3 NonStd Res: CSO Activity: Arginine kinase, with EC number 2.7.3.3 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT 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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