HiaBD2_N may represent the GIN domain of the Head region of TAAs - trimeric autotransporter adhesins. Not all TAAs carry this domain; however, in those that do, the GIN in combination with the Trp-ring domain is necessary for adhesion to fibronectin in the host cell.

1: Repetitive architecture of the Haemophilus influenzae Hia trimeric autotransporter. Meng G, St Geme JW 3rd, Waksman G; J Mol Biol. 2008;384:824-836. PMID:18948113

2: Structure of a Burkholderia pseudomallei trimeric autotransporter adhesin head. Edwards TE, Phan I, Abendroth J, Dieterich SH, Masoudi A, Guo W, Hewitt SN, Kelley A, Leibly D, Brittnacher MJ, Staker BL, Miller SI, Van Voorhis WC, Myler PJ, Stewart LJ; PLoS One. 2010; [Epub ahead of print] PMID:20862217