3ty8 | pdb_00003ty8

Crystal Structure of C. Thermocellum PNKP Ligase Domain Apo Form

spinqualitylabelsall models 3ty8, resolution 2.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3ty8 is a 2 chain structure with sequence from Clostridium thermocellum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: GOL, TAR Related: 3ty5, 3ty9 Gene: Cthe_2768 (Clostridium thermocellum) Activity: RNA ligase (ATP), with EC number 6.5.1.3 Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed Pnkp is the end-healing and end-sealing component of an RNA repair system present in diverse bacteria from ten different phyla. To gain insight to the mechanism and evolution of this repair system, we determined the crystal structures of the ligase domain of Clostridium thermocellum Pnkp in three functional states along the reaction pathway: apoenzyme, ligase*ATP substrate complex, and covalent ligase-AMP intermediate. The tertiary structure is composed of a classical ligase nucleotidyltransferase module that is embellished by a unique alpha-helical insert module and a unique C-terminal alpha-helical module. Structure-guided mutational analysis identified active site residues essential for ligase adenylylation. Pnkp defines a new RNA ligase family with signature structural and functional properties. The adenylyltransferase domain of bacterial Pnkp defines a unique RNA ligase family.,Smith P, Wang LK, Nair PA, Shuman S Proc Natl Acad Sci U S A. 2012 Feb 14;109(7):2296-301. Epub 2012 Jan 27. PMID:22308407 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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