rRNA 2'-O-methyltransferase fibrillarin - P22087 (FBRL_HUMAN)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

S-adenosyl-L-methionine-dependent methyltransferase that has the ability to methylate both RNAs and proteins (PubMed:24352239, PubMed:30540930, PubMed:32017898). Involved in pre-rRNA processing by catalyzing the site-specific 2'-hydroxyl methylation of ribose moieties in pre-ribosomal RNA (PubMed:30540930). Site specificity is provided by a guide RNA that base pairs with the substrate (By similarity). Methylation occurs at a characteristic distance from the sequence involved in base pairing with the guide RNA (By similarity). Probably catalyzes 2'-O-methylation of U6 snRNAs in box C/D RNP complexes (PubMed:32017898). U6 snRNA 2'-O-methylation is required for mRNA splicing fidelity (PubMed:32017898). Also acts as a protein methyltransferase by mediating methylation of 'Gln-105' of histone H2A (H2AQ104me), a modification that impairs binding of the FACT complex and is specifically present at 35S ribosomal DNA locus (PubMed:24352239, PubMed:30540930). UniProt
Catalytic Activity
a ribonucleotide in U6 snRNA + S-adenosyl-L-methionine = a 2'-O-methylribonucleotide in U6 snRNA + H+ + S-adenosyl-L-homocysteine UniProt
Pathway Maps
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Subunit Structure
Component of box C/D small nucleolar ribonucleoprotein (snoRNP) particles that contain SNU13, FBL, NOP5 and NOP56, plus a guide RNA (PubMed:1714385, PubMed:32017898). It is associated with the U3, U8, U13, X and Y small nuclear RNAs (PubMed:1714385). Component of several ribosomal and nucleolar protein complexes. Interacts with PRMT5 and UTP20 (PubMed:14583623, PubMed:17498821). Interacts with DDX5 and C1QBP (PubMed:10837141, PubMed:21536856). Interacts with NOL11 (PubMed:22916032). Interacts with PIH1D1 (PubMed:17636026). Interacts with RRP1B (PubMed:20926688). Interacts with NOLC1 (By similarity). UniProt
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Data in blue originates from PDB
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The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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