This is a family of proteins, previously known as DUF62, found in archaebacteria and bacteria. The structure of proteins in this family is similar to that of a bacterial fluorinating enzyme [1]. S-adenosyl-l-methionine hydroxide adenosyltransferases utilises a rigorously conserved amino acid side chain triad (Asp-Arg-His) which may have a role in activating water to hydroxide ion [2]. This family used to be known as DUF62.

1: Crystal structure of a conserved protein of unknown function (MJ1651) from Methanococcus jannaschii. Rao KN, Burley SK, Swaminathan S; Proteins. 2008;70:572-577. PMID:17910070

2: The fluorinase, the chlorinase and the duf-62 enzymes. Deng H, O'Hagan D; Curr Opin Chem Biol. 2008;12:582-592. PMID:18675376