4nku

Structure of Cid1 in complex with its short product ApU

spinqualitylabelsall models 4nku, resolution 1.94Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4nku is a 4 chain structure with sequence from Schizosaccharomyces pombe. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.94Å Ligands: BR, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function CID1_SCHPO Involved in cell cycle arrest where in association with crb2/rhp9 and chk1 it inhibits unscheduled mitosis. Publication Abstract from PubMed The addition of uridine nucleotide by the poly(U) polymerase (PUP) enzymes has a demonstrated impact on various classes of RNAs such as microRNAs (miRNAs), histone-encoding RNAs and messenger RNAs. Cid1 protein is a member of the PUP family. We solved the crystal structure of Cid1 in complex with non-hydrolyzable UMPNPP and a short dinucleotide compound ApU. These structures revealed new residues involved in substrate/product stabilization. In particular, one of the three catalytic aspartate residues explains the RNA dependence of its PUP activity. Moreover, other residues such as residue N165 or the beta-trapdoor are shown to be critical for Cid1 activity. We finally suggest that the length and sequence of Cid1 substrate RNA influence the balance between Cid1's processive and distributive activities. We propose that particular processes regulated by PUPs require the enzymes to switch between the two types of activity as shown for the miRNA biogenesis where PUPs can either promote DICER cleavage via short U-tail or trigger miRNA degradation by adding longer poly(U) tail. The enzymatic properties of these enzymes may be critical for determining their particular function in vivo. A critical switch in the enzymatic properties of the Cid1 protein deciphered from its product-bound crystal structure.,Munoz-Tello P, Gabus C, Thore S Nucleic Acids Res. 2013 Dec 9. PMID:24322298 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Poly(A) RNA polymerase

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