Figure 1.

Alignment of conserved domains in the deduced amino acid sequences of A. thaliana SIG1 (At SIG1), SIG2 (At SIG2), and SIG3 (At SIG3) with those of SigA from Anabaena sp. PCC 7120 (An SigA), SigA from C. caldarium (Cc SigA), and σ⁷⁰ factor encoded in rpoD from E. coli (Ec RpoD). Regions 1–4 in bacterial σ factors (5, 26) are boxed. Residues marked with an asterisk (∗) or a dot (•) are identical or similar, respectively, in all six sequences. The numbers between the product designations and the amino acid sequences are those of amino acid residues. There are 246 amino acids in a gap between subregion 1.2 and subregion 2.1 in E. coli RpoD.