FIG. 2.

Nucleotide sequence of the ahpB gene and amino acid sequence deduced from its open reading frame. DNA bases (top line) and amino acids (one-letter code) are numbered at the right. The ATG initiation codon (boldface) is preceded by a potential Shine-Dalgarno (boldface and underlined). Initiation of prepro-AhpB, pro-AhpB, and mature AhpB proteins is underlined by an arrow. The symbol—indicates the TGA termination codon; underlined boldfaced amino acid positions 184 to 196 correspond to the amino-terminal sequence determined for both the purified AhpB mature protease and the purified 43.4-kDa intermediate; double-underlined and boldfaced amino acid positions 318 to 327 correspond to a zinc-binding region signature.