This is the N-terminal domain found in proteins from plants, yeast and humans, including 25S rRNA (uridine-N(3))-methyltransferase BMT5 from S. cerevisiae and the poorly characterised Ferredoxin-fold anticodon-binding domain-containing protein 1 from human and Heavy metal-associated isoprenylated plant protein 41 from Arabidopsis. This domain has a characteristic Rossmann-like fold of S-adenosyl-L-methionine (SAM) binding domains [1]. BTM5 is a SAM-dependent methyltransferase that specifically methylates the N3 position of uridine in 25S rRNA.

1: Identification of novel methyltransferases, Bmt5 and Bmt6, responsible for the m3U methylations of 25S rRNA in Saccharomyces cerevisiae. Sharma S, Yang J, Duttmann S, Watzinger P, Kotter P, Entian KD; Nucleic Acids Res. 2014;42:3246-3260. PMID:24335083