The primary structure of the DNA-binding protein II from Clostridium pasteurianum

The complete amino acid sequence of the Clostridium pasteurianum DNA-binding protein II (DNAb-II) has been determined. The molecule contains 91 amino acid residues and has an M_rof 10133. Sequence data were obtained from manual Edman degradation, using the DABITC/PITC double-coupling of the tryptic, peptic, chymotryptic and Staphylococcus protease peptides. A comparison of the amino acid sequence of the C. pasteurianum DNAb-II with those of the DNAb-II from Escherichia coli, Bacillus stearothermophilus, Thermoplasma acidophilum and Pseudomonas aeruginosa shows that the C. pasteurianum protein is more homologous to that of B. stearothermophilus (60%) than to that of E. coli (45%). All DNAb-II proteins have identical sequences Gly-Phe-Gly-X-Phe at positions 46-50 and Arg-Asn-Pro-X-Thr at positions 61-65.