InterPro domain: IPR012946

The X8 domain [ 1 ] contains 6 conserved cysteine residues that presumably form three disulphide bridges. The domain is found in an Olive pollen allergen [ 2 ] as well as at the C terminus of family 17 glycosyl hydrolases [ 3 ]. This domain may be involved in carbohydrate binding.

1. Glycoside hydrolases and glycosyltransferases. Families, modules, and implications for genomics. Plant Physiol. 124, 1515-9
2. A major allergen from pollen defines a novel family of plant proteins and shows intra- and interspecies [correction of interspecie] cross-reactivity. J. Immunol. 172, 3644-51
3. A census of carbohydrate-active enzymes in the genome of Arabidopsis thaliana. Plant Mol. Biol. 47, 55-72