7nsa | pdb_00007nsa

Triphosphate tunnel metalloenzyme from Sulfolobus acidocaldarius in complex with pyrophosphate and calcium

spinqualitylabelsall models 7nsa, resolution 1.95Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7nsa is a 1 chain structure with sequence from Sulac. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ACT, CA, GOL, PEG, POP Gene: Saci_0718 (SULAC) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed CYTH proteins make up a large superfamily that is conserved in all three domains of life. These enzymes have a triphosphate tunnel metalloenzyme (TTM) fold, which typically results in phosphatase functions, e.g. RNA triphosphatase, inorganic polyphosphatase or thiamine triphosphatase. Some CYTH orthologs cyclize nucleotide triphosphates to 3',5'-cyclic nucleotides. So far, archaeal CYTH proteins have been annotated as adenylyl cyclases, although experimental evidence to support these annotations is lacking. To address this gap, we characterized a CYTH ortholog, SaTTM, from the crenarchaeote Sulfolobus acidocaldarius. Our in silico studies derived ten major subclasses within the CYTH family implying a close relationship between these archaeal CYTH enzymes and class IV adenylyl cyclases. However, initial biochemical characterization reveals inability of SaTTM to produce any cyclic nucleotides. Instead, our structural and functional analyses show a classical TTM behavior, i.e. triphosphatase activity, where pyrophosphate causes product inhibition. The Ca(2+)-inhibited Michaelis complex indicates a two-metal ion reaction mechanism analogous to other TTMs. Co-crystal structures of SaTTM further reveal conformational dynamics in SaTTM that suggest feedback inhibition in TTMs due to tunnel closure in the product state. These structural insights combined with further sequence-similarity network based in silico analyses provide a firm molecular basis for distinguishing CYTH orthologs with phosphatase activities from class IV adenylyl cyclases. The archaeal triphosphate tunnel metalloenzyme SaTTM defines structural determinants for the diverse activities in the CYTH protein family.,Vogt MS, Ngouoko Nguepbeu RR, Mohr MKF, Albers SV, Essen LO, Banerjee A J Biol Chem. 2021 May 21:100820. doi: 10.1016/j.jbc.2021.100820. PMID:34029589 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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