... hold the b-sandwich in position. With the exception of four a-helices and t wo pairs of short b-strands, the rest of the protein consists almost entirely of loopsconnecting the b-strands. The ... is the predominant product of hydrolysis and increases inconcentration as the reaction proceeds [21]. The exo-loop of 1CEL (amino acids 24 3–2 56) forms the roof of the active sitetunnel at the ... bold (1 9–2 5, 5 0–7 1, 6 1–6 7, 13 5–4 01, 16 9–2 07, 17 3–2 06, 22 7–2 53, 23 5–2 40 and 25 8–3 34 bp). Four tryptophan residues involved in the glucosyl-bindinding platform (W38, W40, W371, W380) in the active-site...