Fig. 2.

Comparison of FKBP20-2 and related protein sequences. The amino acid sequence of A. thaliana (At3g60307) FKBP20-2 was aligned with homologs in rice (O. sativa, Q7XHRO), a green alga (C. reinhardtii, gene model C_2101108), and a cyanobacterium (S. elongatus, Q8DJW8). Sequences were aligned with ClustalW (38). The line indicates the hydrophobic stretch after the two arginine residues (boxed) that constitute the derived thylakoid targeting sequence (21). Arrows indicate conserved cysteine residues in land plants and the green alga that are absent in the cyanobacterial proteins. Asterisks indicate positions essential for PPIase activity (25).