This family includes the 5-keto 4-deoxyuronate isomerase enzyme EC:5.3.1.17 that is involved in pectin degradation. This family aldo includes bacterial Myo-inositol catabolism (IolB) proteins. The Bacillus subtilis inositol operon (iolABCDEFGHIJ) is involved in myo-inositol catabolism. Glucose repression of the iol operon induced by inositol is exerted through catabolite repression mediated by CcpA and the iol induction system mediated by IolR [2]. The exact function of IolB is unknown. Members of this family possess a Cupin like structure.

1: Analysis of an Erwinia chrysanthemi gene cluster involved in pectin degradation. Condemine G, Robert-Baudouy J; Mol Microbiol 1991;5:2191-2202. PMID:1766386

2: Involvement of two distinct catabolite-responsive elements in catabolite repression of the Bacillus subtilis myo-inositol (iol) operon. Miwa Y, Fujita Y; J Bacteriol 2001;183:5877-5884. PMID:11566986