The enzyme 3,7-dimethylquercetin 4'-O-methyltransferase uses S-adenosyl methionine and 5,3',4'-trihydroxy-3,7-dimethoxyflavone (rhamnazin) to produce S-adenosylhomocysteine and 5,3'-dihydroxy-3,7,4'-trimethoxyflavone (ayanin).
The enzyme 8-hydroxyquercetin 8-O-methyltransferase uses S-adenosyl methionine and gossypetin to produce S-adenosylhomocysteine and 3,5,7,3',4'-pentahydroxy-8-methoxyflavone.
The enzyme 3-methylquercetin 7-O-methyltransferase uses S-adenosyl methionine and 5,7,3',4'-tetrahydroxy-3-methoxyflavone (isorhamnetin) to produce S-adenosylhomocysteine and 5,3',4'-trihydroxy-3,7-dimethoxyflavone (rhamnazin).
The enzyme 3,7-dimethylquercetin 4'-O-methyltransferase uses S-adenosyl methionine and rhamnazin to produce S-adenosylhomocysteine and ayanin.
Methyltransferases are also responsible for the addition of methyl groups to the 2' hydroxyls of the first and second nucleotides next to the 5' cap in messenger RNA.
O-6-methylguanine-DNA methyltransferase | 3,7-dimethylquercetin 4'-O-methyltransferase | Methyltransferase | methyltransferase | L-isoaspartyl methyltransferase | DNA methyltransferase | 8-hydroxyquercetin 8-O-methyltransferase | 3-methylquercetin 7-O-methyltransferase |
The 286 kDa protein is a polyprotein involved in virus replication and has four conserved domains: methyltransferase, protease, helicase and an RNA dependent RNA polymerase.
Finally, DNMT2 (TRDMT1) has been identified as a DNA methyltransferase homolog, containing all 10 sequence motifs common to all DNA methyltransferases; however, DNMT2 (TRDMT1) does not methylate DNA but instead methylates cytosine-38 in the anticodon loop of aspartic acid transfer RNA.
Petunidin could form in the exocarp of fruits from delphinidin, with an anthocyanin flavonoid O-methyltransferase (Catechol-O-methyl transferase) catalyzing the B-ring methylation and S-Adenosyl-L-methyl-3H methionine being the methyl group donor.
STAT5 can also form homo-tetramers, usually in concert with the histone methyltransferase EZH2, and act as a trancriptional repressor.
Clarke's research at UCLA has focused on roles of novel protein methyltransferases in aging and biological regulation highlighted by discoveries of the protein repair L-isoaspartyl methyltransferase, the isoprenylcysteine protein methyltransferase, and the protein phosphatase 2A methyltransferase.
It can also be associated with mutations in the histone methyltransferase NSD1 gene on chromosome 5q35.