9jgc

Crystal structure of Nep1 in complex with adenosine from Pyrococcus horikoshii OT3

spinqualitylabelsall models 9jgc, resolution 2.01Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9jgc is a 1 chain structure with sequence from Pyrococcus horikoshii OT3. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.01Å Ligands: ADN, CL, EDO, PEG, SO3, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function NEP1_PYRHO Methyltransferase involved in ribosomal biogenesis. Specifically catalyzes the N1-methylation of the pseudouridine corresponding to position 914 in M.jannaschii 16S rRNA.[HAMAP-Rule:MF_00554] Publication Abstract from PubMed Nucleolar essential protein 1 (Nep1; also known as ribosomal RNA small subunit methyltransferase Nep1) is a crucial factor in forming small ribosomal subunits in eukaryotes and archaea. Nep1 possesses an S-adenosyl-L-methionine (SAM)-dependent SpoU-TrmD (SPOUT) ribosomal RNA (rRNA) methyltransferase (MTase) fold and catalyzes pseudouridine (Psi) methylation at specific sites of the small subunit (SSU) rRNA. Mutations in Nep1 proteins result in a severe developmental disorder in humans and reduced growth in yeast, suggesting its role in ribosome biogenesis. In this study, the crystal structures of Nep1 from the archaebacterium Pyrococcus horikoshii (PhNep1), both in its apo and holo (adenosine or 5-methylthioadenosine bound) forms have been reported. The structural analysis of PhNep1 revealed an alpha/beta fold featuring a deep trefoil knot akin to the SPOUT domain, with two novel extensions-a globular loop and a beta-alpha-beta extension. Moreover, the cofactor-binding site of PhNep1 exhibits a preformed pocket, topologically similar to that of other SPOUT-class MTases. Further, structural analysis of PhNep1 revealed that it forms a homodimer coordinated by inter-subunit hydrogen bonds and hydrophobic interactions. Moreover, the results of this study indicate that PhNep1 can specifically methylate consensus RNAs, having a pseudouridine (psi) located at position 926 of helix 35 (h35) of 16S rRNA in P. horikoshii. The stability of the Nep1-RNA complex seems to be primarily assisted by the conserved arginine residues located at the dimeric interface. Structural analysis of the ribosome assembly factor Nep1, an N1-specific pseudouridine methyltransferase, reveals mechanistic insights.,Saha S, Kanaujia SP FEBS J. 2025 Feb 7. doi: 10.1111/febs.70005. PMID:39918246 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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