This is the N-terminal beta-barrel domain found in the polymerizing galactofuranosyltransferase GlfT2 (Rv3808c). This enzyme synthesizes the bulk of the galactan portion of the mycolyl-arabinogalactan complex, which is the largest component of the mycobacterial cell wall such as in Mycobacterium tuberculosis. The N-terminal domain contains two short helices preceding a 10-stranded beta-sandwich with jelly roll topology [1].

1: Tetrameric structure of the GlfT2 galactofuranosyltransferase reveals a scaffold for the assembly of mycobacterial Arabinogalactan. Wheatley RW, Zheng RB, Richards MR, Lowary TL, Ng KK; J Biol Chem. 2012;287:28132-28143. PMID:22707726