FIGURE 1.

Overall structure of FnCel5A from F. nodosum Rt17-B1. a, ribbon representation of the two Se-FnCel5A molecules in one asymmetric unit. The coloring is from blue at the N terminus to red at the C terminus. b, ribbon and topology diagram of FnCel5A showing the (β/α)₈-barrel architecture of the monomer. Helices are shown in cyan, and strands are shown in magenta. Glucose molecules are shown in orange and ball-and-stick representation. c, a stereoview of superposition between FnCel5A and CtCelC complex model. The subsite numbers are labeled from −2 to +1. Proteins are shown in ribbon. Ligands and catalytic residues of FnCel5A are shown in yellow and ball-and-stick representation compared with the magenta representation in CtCelC.