5kal

Terminal uridylyl transferase 4 from Trypanosoma brucei with bound UTP and UpU

spinqualitylabelsall models 5kal, resolution 2.75Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5kal is a 4 chain structure with sequence from Trypanosoma brucei. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.75Å Ligands: MG, UTP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function TUT4_TRYB2 Terminal uridylyltransferase which, specifically, catalyzes the addition of Us to the 3'-hydroxyl group of single-stranded RNAs with a 3'-terminal U. Publication Abstract from PubMed Terminal uridyltransferases (TUTases) execute 3' RNA uridylation across protists, fungi, metazoan and plant species. Uridylation plays a particularly prominent role in RNA processing pathways of kinetoplastid protists typified by the causative agent of African sleeping sickness, Trypanosoma brucei In mitochondria of this pathogen, most mRNAs are internally modified by U-insertion/deletion editing while guide RNAs and rRNAs are U-tailed. The founding member of TUTase family, RNA editing TUTase 1 (RET1), functions as a subunit of the 3' processome in uridylation of gRNA precursors and mature guide RNAs. Along with KPAP1 poly(A) polymerase, RET1 also participates in mRNA translational activation. RET1 is divergent from human TUTases and is essential for parasite viability in the mammalian host and the insect vector. Given its robust in vitro activity, RET1 represents an attractive target for trypanocide development. Here, we report high-resolution crystal structures of the RET1 catalytic core alone and in complex with UTP analogs. These structures reveal a tight docking of the conserved nucleotidyl transferase bi-domain module with a RET1-specific C2H2 zinc finger and RNA recognition (RRM) domains. Furthermore, we define RET1 region required for incorporation into the 3' processome, determinants for RNA binding, subunit oligomerization and processive UTP incorporation, and predict druggable pockets. RNA Editing TUTase 1: structural foundation of substrate recognition, complex interactions and drug targeting.,Rajappa-Titu L, Suematsu T, Munoz-Tello P, Long M, Demir O, Cheng KJ, Stagno JR, Luecke H, Amaro RE, Aphasizheva I, Aphasizhev R, Thore S Nucleic Acids Res. 2016 Oct 15. pii: gkw917. PMID:27744351 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also RNA uridylyltransferase

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