Figure 6.

Partial alignment and phylogenetic relationship among family 31 α-glycosyl hydrolases. A, Alignment of the family 31 PROSITE signature sequences (labeled with the PROSITE accession no.) from known and putative plant α-xylosidases and two plant α-glucosidases. Dots mean conserved amino acids. B, Concise cladogram for family 31 glycosyl hydrolases. ●, The probable point where plant cell wall α-xylosidases started to diverge from α-glucosidases. ○, The independent origin of recently discovered prokaryotic α-xylosidases. Figures between brackets show sequence correspondence between A and B.