3KL5 STRUCTURE ANALYSIS OF A XYLANASE FROM GLYCOSYL HYDROLASE FAMILY THIRTY: CARBOHYDRATE LIGAND COMPLEXES REVEAL THIS FAMILY OF ENZYMES UNIQUE MECHANISM OF SUBSTRATE SPECIFICITY AND RECOGNITION HYDROLASE, ALPHA-BETA BARREL, (BETA/ALPHA)8 BARREL, (BETA/ALPHA)8 + BETA MOTIF, DUAL MOTIF HYDROLASE, ALDOTRIURONIC ACID BOUND STRUCTURE, ALDOTRIURONATE BOUND STRUCTURE, XYNC