5ap8

Structure of the SAM-dependent rRNA:acp-transferase Tsr3 from S. solfataricus

spinqualitylabelsall models 5ap8, resolution 2.25Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5ap8 is a 3 chain structure with sequence from Saccharolobus solfataricus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.246Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function TSR3_SACS2 Aminocarboxypropyltransferase that catalyzes the aminocarboxypropyl transfer on pseudouridine corresponding to position 914 in M.jannaschii 16S rRNA. It constitutes the last step in biosynthesis of the hypermodified N1-methyl-N3-(3-amino-3-carboxypropyl) pseudouridine (m1acp3-Psi).[HAMAP-Rule:MF_01116] Publication Abstract from PubMed The chemically most complex modification in eukaryotic rRNA is the conserved hypermodified nucleotide N1-methyl-N3-aminocarboxypropyl-pseudouridine (m1acp3Psi) located next to the P-site tRNA on the small subunit 18S rRNA. While S-adenosylmethionine was identified as the source of the aminocarboxypropyl (acp) group more than 40 years ago the enzyme catalyzing the acp transfer remained elusive. Here we identify the cytoplasmic ribosome biogenesis protein Tsr3 as the responsible enzyme in yeast and human cells. In functionally impaired Tsr3-mutants, a reduced level of acp modification directly correlates with increased 20S pre-rRNA accumulation. The crystal structure of archaeal Tsr3 homologs revealed the same fold as in SPOUT-class RNA-methyltransferases but a distinct SAM binding mode. This unique SAM binding mode explains why Tsr3 transfers the acp and not the methyl group of SAM to its substrate. Structurally, Tsr3 therefore represents a novel class of acp transferase enzymes. Ribosome biogenesis factor Tsr3 is the aminocarboxypropyl transferase responsible for 18S rRNA hypermodification in yeast and humans.,Meyer B, Wurm JP, Sharma S, Immer C, Pogoryelov D, Kotter P, Lafontaine DL, Wohnert J, Entian KD Nucleic Acids Res. 2016 Apr 15. pii: gkw244. PMID:27084949 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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