4ohx | pdb_00004ohx

C. Elegans Clp1 bound to ADP and Mg2+ (RNA released state)

spinqualitylabelsall models 4ohx, resolution 1.98Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4ohx is a 1 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: 2PE, ADP, MG Related: 4ohv, 4ohw, 4ohy, 4ohz, 4oi0, 4oi1, 4oi2 Resources: FirstGlance, OCA, RCSB, PDBsum Function [CLP1_CAEEL] Required for endonucleolytic cleavage during polyadenylation-dependent pre-mRNA 3'-end formation (By similarity). Publication Abstract from PubMed RNA-specific polynucleotide kinases of the Clp1 subfamily are key components of various RNA maturation pathways. However, the structural basis explaining their substrate specificity and the enzymatic mechanism is elusive. Here, we report crystal structures of Clp1 from Caenorhabditis elegans (ceClp1) in a number of nucleotide- and RNA-bound states along the reaction pathway. The combined structural and biochemical analysis of ceClp1 elucidates the RNA specificity and lets us derive a general model for enzyme catalysis of RNA-specific polynucleotide kinases. We identified an RNA binding motif referred to as "clasp" as well as a conformational switch that involves the essential Walker A lysine (Lys127) and regulates the enzymatic activity of ceClp1. Structural comparison with other P loop proteins, such as kinases, adenosine triphosphatases (ATPases), and guanosine triphosphatases (GTPases), suggests that the observed conformational switch of the Walker A lysine is a broadly relevant mechanistic feature. RNA specificity and regulation of catalysis in the eukaryotic polynucleotide kinase clp1.,Dikfidan A, Loll B, Zeymer C, Magler I, Clausen T, Meinhart A Mol Cell. 2014 Jun 19;54(6):975-86. doi: 10.1016/j.molcel.2014.04.005. Epub 2014 , May 8. PMID:24813946 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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