Family of the DNA polymerase beta superfamily, with closest affinities to the Minimal Nucleotide Transferase clade (MNT). Observed in diverse RNA repair genome contexts centered on both RtcB and Rnl-type (ATP-grasp fold) repair ligases [1]. Members of this family of bacterial proteins catalyze the transfer of nucleotide residues from nucleoside diphosphates or triphosphates into dimer or polymer forms.

1: RNA damage in biological conflicts and the diversity of responding RNA repair systems. Burroughs AM, Aravind L; Nucleic Acids Res. 2016;44:8525-8555. PMID:27536007