This family contains a number of bacterial and eukaryotic proteins approximately 400 residues long that resemble ferredoxin and appear to have sucrolytic activity [1].

1: Characterisation of a complementary DNA encoding a novel plant enzyme with sucrolytic activity. Machray GC, Burch L, Hedley PE, Davies HV, Waugh R; FEBS Lett 1994;354:123-127. PMID:7957893