7wae

Trichodesmium erythraeum cyanophycin synthetase 1 (TeCphA1) with ATPgammaS, 4x(beta-Asp-Arg), and aspartate

spinqualitylabelsall models 7wae, resolution 2.64Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7wae is a 8 chain structure with sequence from Trichodesmium erythraeum IMS101 and Synthetic construct. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 2.64Å Ligands: AGS, ARG, ASP, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q113V7_TRIEI Catalyzes the ATP-dependent polymerization of arginine and aspartate to multi-L-arginyl-poly-L-aspartic acid (cyanophycin; a water-insoluble reserve polymer).[ARBA:ARBA00003184] Publication Abstract from PubMed Cyanophycin is a natural biopolymer consisting of equimolar amounts of aspartate and arginine as the backbone and branched sidechain, respectively. It is produced by a single enzyme, cyanophycin synthetase (CphA1), and accumulates as a nitrogen reservoir during N(2) fixation by most cyanobacteria. A recent structural study showed that three constituent domains of CphA1 function as two distinct catalytic sites and an oligomerization interface in cyanophycin synthesis. However, it remains unclear how the ATP-dependent addition of aspartate to cyanophycin is initiated at the catalytic site of the glutathione synthetase-like domain. Here, we report the cryogenic electron microscopy structures of CphA1, including a complex with aspartate, cyanophycin primer peptide, and ATP analog. These structures reveal the aspartate binding mode and phosphate-binding loop movement to the active site required for the reaction. Furthermore, structural and mutational data show a potential role of protein dynamics in the catalytic efficiency of the arginine condensation reaction. Structural bases for aspartate recognition and polymerization efficiency of cyanobacterial cyanophycin synthetase.,Miyakawa T, Yang J, Kawasaki M, Adachi N, Fujii A, Miyauchi Y, Muramatsu T, Moriya T, Senda T, Tanokura M Nat Commun. 2022 Aug 30;13(1):5097. doi: 10.1038/s41467-022-32834-8. PMID:36042318 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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