5ej3 is a 2 chain structure with sequence from Streptomyces lividans. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
XYNB_STRLI Contributes to hydrolyze hemicellulose, the major component of plant cell-walls. XLNA and XLNB seem to act sequentially on the substrate to yield xylobiose and xylose as carbon sources.