Figure 1.

Alignment of the deduced amino acid sequences of the genes encoding σ factors from different organisms. Only the conserved C-terminal two-thirds of all sequences are shown in this alignment. The conserved subdomains are marked above the sequences and their postulated functions are indicated. Residues marked with a star indicate that identical residues occur at the same position in all eight aligned sequences, and the symbol ^ indicates that six or seven of the eight aligned sequences have the same residue at the position. The dots within the sequences indicate gaps introduced for the best alignment. Zm Sig1 and Zm Sig2, gene products of sig1 and sig2 of Zea mays (AF058708; AF058709); Sa Sig1, gene product of sig1 of Sinapis alba (Y15899); Sb Sig1, gene product of sig1 of Sorghum bicolor (Y14276); Os SigA, gene product of sigA of Oryza sativa (AB005290) (12); At Sig1, At Sig2 and At Sig3, gene products of sig1, sig2, and sig3 of A. thaliana (AB004820, AB004821, AB004822, respectively) (10, 11).