This conserved feature at the N-terminus of bacterial translation initiation factor IF2 has recently had its structure solved. It shows structural similarity to the tRNA anticodon Stem Contact Fold domains of the methionyl-tRNA and glutaminyl-tRNA synthetases, and a similar fold is also found in the B5 domain of the phenylalanine-tRNA synthetase.

1: Tandem translation of E. coli initiation factor IF2 beta: purification and characterization in vitro of two active forms. Nyengaard NR, Mortensen KK, Lassen SF, Hershey JW, Sperling-Petersen HU; Biochem Biophys Res Commun 1991;181:1572-1579. PMID:1764105

2: A conserved structural motif at the N-terminus of bacterial translation initiation factor IF2. Laursen BS, Mortensen KK, Sperling-Petersen HU, Hoffman DW; 0;0:0-0. PMID:12600987