Fig. 5.

Unrooted, NJ-based tree of class III glutaredoxins from land plants. The analysis was performed using MEGA 4. Branch lengths are proportional to phylogenetic distances. The name of the protein is composed of the two-letter code for the species followed by the number of the isoform, for example, 1–24 for Populus. The exception is for A. thaliana sequences which follow the nomenclature defined in [2], with a C or an S indicating the dithiol or monothiol nature of the active site. The proteins are distributed into four subgroups (see the text for their description). The sequences from cyanobacteria form an independent group with two branches, whereas most eukaryote CGFS Grxs are clustering in the previous Grx subgroups described for higher plants, Grx S14 to S17. As for class I Grxs, a few algal members are isolated