RRNA small subunit pseudouridine methyltransferase Nep1

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RRNA small subunit pseudouridine methyltransferase Nep1
EC number2.1.1.260
IntEnzIntEnz view
ExPASyNiceZyme view
MetaCycmetabolic pathway
PDB structuresRCSB PDB PDBe PDBsum

RRNA small subunit pseudouridine methyltransferase Nep1 (EC, Nep1, nucleolar essential protein 1) is an enzyme with systematic name S-adenosyl-L-methionine:18S rRNA (pseudouridine1191-N1)-methyltransferase.[1][2][3] This enzyme catalyses the following chemical reaction

S-adenosyl-L-methionine + pseudouridine1191 in yeast 18S rRNA S-adenosyl-L-homocysteine + N1-methylpseudouridine1191 in yeast 18S rRNA

This enzyme recognizes specific pseudouridine residues (Psi) in small subunits of ribosomal RNA based on the local RNA structure.


  1. ^ Taylor AB, Meyer B, Leal BZ, Kötter P, Schirf V, Demeler B, Hart PJ, Entian KD, Wöhnert J (March 2008). "The crystal structure of Nep1 reveals an extended SPOUT-class methyltransferase fold and a pre-organized SAM-binding site". Nucleic Acids Research. 36 (5): 1542–54. doi:10.1093/nar/gkm1172. PMC 2275143. PMID 18208838.
  2. ^ Wurm JP, Meyer B, Bahr U, Held M, Frolow O, Kötter P, Engels JW, Heckel A, Karas M, Entian KD, Wöhnert J (April 2010). "The ribosome assembly factor Nep1 responsible for Bowen-Conradi syndrome is a pseudouridine-N1-specific methyltransferase". Nucleic Acids Research. 38 (7): 2387–98. doi:10.1093/nar/gkp1189. PMC 2853112. PMID 20047967.
  3. ^ Meyer B, Wurm JP, Kötter P, Leisegang MS, Schilling V, Buchhaupt M, Held M, Bahr U, Karas M, Heckel A, Bohnsack MT, Wöhnert J, Entian KD (March 2011). "The Bowen-Conradi syndrome protein Nep1 (Emg1) has a dual role in eukaryotic ribosome biogenesis, as an essential assembly factor and in the methylation of Ψ1191 in yeast 18S rRNA". Nucleic Acids Research. 39 (4): 1526–37. doi:10.1093/nar/gkq931. PMC 3045603. PMID 20972225.

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