FIG. 9.

Comparative features of the amino terminus of BphS. The boxes indicate invariant residues in sequences. The amino terminus of BphS is aligned with those of protein kinases, including human cAMP-dependent protein kinase catalytic subunit PKA-Cα (National Center for Biotechnology Information protein database accession number P17621), Saccharomyces cerevisiae Ste20 (AAA35039), human mitogen-activated protein kinase JNK3 (Jnk3s) (U76020), and BpdS (AAB52543). The roman numerals indicate the positions of conserved subdomains in eukaryotic serine/threonine kinases (8). The asterisks indicate the residues mentioned in the text.