This narrowly distributed protein family contains an N-terminal radical SAM domain. It occurs in Pseudomonas fluorescens Pf0-1, Ralstonia solanacearum, and numerous species and strains of Burkholderia. Members always occur next to a trio of three mutually homologous genes, all of which contain the domain pfam08898 as the whole of the protein (about 60 amino acids) or as the C-terminal domain. The function is unknown, but the fact that all phylogenetically correlated proteins are mutually homologous with prominent invariant motifs (an invariant tyrosine and a GDL motif) and as small as 60 amino acids suggests that post-translational modification of pfam08898 domain-containing proteins may be its function. This view is supported by closer homology to the PqqE radical SAM protein involved in PQQ biosynthesis from the PqqA precursor peptide than to other characterized radical SAM proteins. [Unknown function, Enzymes of unknown specificity]
Jiyao W et al.(2023). "The conserved domain database in 2023.",