This family includes bacterial transmembrane proteins with a putative sugar-specific permease function, including and analogous to the IIC component of the PTS system. It has been suggested that this permease may form part of an L-ascorbate utilisation pathway, with proposed specificity for 3-keto-L-gulonate (formed by hydrolysis of L-ascorbate)[1]. This family includes the IIC component of the galactitol specific GAT family PTS system.

1: Utilization of L-ascorbate by Escherichia coli K-12: assignments of functions to products of the yjf-sga and yia-sgb operons. Yew WS, Gerlt JA; J Bacteriol 2002;184:302-306. PMID:11741871