Fig. 1.

Phylogenetic analysis of transporter proteins used in this study. Cladogram of protein sequences included in this study assembled by ClustalW and visualized in TreeView X. The functional ORFs show a great deal of clustering. Group A consists of ORFs with low growth rates, and only C. intermedia GXS1 confers growth on xylose. Group B consists of nonspecific but efficient transporters. Members of group C confer xylose growth and exhibit moderate to high xylose-to-glucose preference ratios yet still prefer glucose. Prefixes: At, A. thaliana; Ec, E. coli, Ci, C. intermedia; Dh, D. hansenii; Yl, Y. lipolytica; Sc, S. cerevisiae; Ss, S. stipitis; Cn, C. neoformans. X, xylose; G, glucose.