This is the C-terminal domain of N-formyltransferase found in Francisella tularensis. N-formylated sugars are observed on O-antigens of pathogenic Gram-negative bacteria. This C-terminal domain is responsible for dimerization. In particular, the beta hairpin motif present in the domain helps create a subunit-subunit interface. The dimeric interface is characterized by a hydrophobic patch formed by Ile 195, Leu 197, Val 201, Met 203, Ile 207, Phe 223, Val 231, Val 233, Leu 235, and Leu 237 from both monomers [1].

1: Three-dimensional structure of a sugar N-formyltransferase from Francisella tularensis. Zimmer AL, Thoden JB, Holden HM; Protein Sci. 2014;23:273-283. PMID:24347283