This family contains OB-fold domains that bind to nucleic acids [4]. The family includes the anti-codon binding domain of lysyl, aspartyl, and asparaginyl -tRNA synthetases (See Pfam:PF00152). Aminoacyl-tRNA synthetases catalyse the addition of an amino acid to the appropriate tRNA molecule EC:6.1.1.-. This family also includes part of RecG helicase involved in DNA repair. Replication factor A is a hetero-trimeric complex, that contains a subunit in this family [2,3]. This domain is also found at the C-terminus of bacterial DNA polymerase III alpha chain.

1: Class II aminoacyl transfer RNA synthetases: crystal structure of yeast aspartyl-tRNA synthetase complexed with tRNA(Asp). Ruff M, Krishnaswamy S, Boeglin M, Poterszman A, Mitschler A, Podjarny A, Rees B, Thierry JC, Moras D; Science 1991;252:1682-1689. PMID:2047877

2: Rpa4, a homolog of the 34-kilodalton subunit of the replication protein A complex. Keshav KF, Chen C, Dutta A; Mol Cell Biol 1995;15:3119-3128. PMID:7760808

3: Structure of the single-stranded-DNA-binding domain of replication protein A bound to DNA. Bochkarev A, Pfuetzner RA, Edwards AM, Frappier L; Nature 1997;385:176-181. PMID:8990123

4: Protein fold recognition using sequence profiles and its application in structural genomics. Koonin EV, Wolf YI, Aravind L; Adv Protein Chem 2000;54:245-275. PMID:10829230