This domain is often found adjacent to the DHH domain Pfam:PF01368 and is called DHHA1 for DHH associated domain. This domain is diagnostic of DHH subfamily 1 members [1]. This domains is also found in alanyl tRNA synthetase e.g. Swiss:P00957, suggesting that this domain may have an RNA binding function. The domain is about 60 residues long and contains a conserved GG motif.

1: A novel family of predicted phosphoesterases includes Drosophila prune protein and bacterial RecJ exonuclease. Aravind L, Koonin EV; Trends Biochem Sci 1998;23:17-19. PMID:9478130