This is a SH3-like domain associated with the MutS-like ABC ATPase and Smr domains. It has been predicted to play a role in lesion recognition or alternatively in mediating contacts with RNA primers or misincorporated ribonucleotides during DNA repair or interacting with the ribosome at the intersection between DNA repair and ribosome rescue [1].

1: Comprehensive classification of ABC ATPases and their functional radiation in nucleoprotein dynamics and biological conflict systems. Krishnan A, Burroughs AM, Iyer LM, Aravind L; Nucleic Acids Res. 2020;48:10045-10075. PMID:32894288