The N-terminal domain of RecQ-mediated genome instability protein 1 carries an oligo-nucleotide-binding domain or OB-fold, and forms a stable complex with Bloom syndrome protein BLM and DNA topoisomerase 3-alpha [1-3]. At the very N-terminal, it has a 3-helix bundle, represented in this entry, which protrudes to one side of the structure and makes extensive hydrophobic contacts with the convex side of the beta-barrel [3].

1: RMI, a new OB-fold complex essential for Bloom syndrome protein to maintain genome stability. Xu D, Guo R, Sobeck A, Bachrati CZ, Yang J, Enomoto T, Brown GW, Hoatlin ME, Hickson ID, Wang W; Genes Dev. 2008;22:2843-2855. PMID:18923082

2: BLAP18/RMI2, a novel OB-fold-containing protein, is an essential component of the Bloom helicase-double Holliday junction dissolvasome. Singh TR, Ali AM, Busygina V, Raynard S, Fan Q, Du CH, Andreassen PR, Sung P, Meetei AR; Genes Dev. 2008;22:2856-2868. PMID:18923083

3: Crystal structures of RMI1 and RMI2, two OB-fold regulatory subunits of the BLM complex. Wang F, Yang Y, Singh TR, Busygina V, Guo R, Wan K, Wang W, Sung P, Meetei AR, Lei M; Structure. 2010;18:1159-1170. PMID:20826342