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J Bacteriol. 1987 July; 169(7): 3088-3093

Cloning and nucleotide sequencing of genes for a second type of small, acid-soluble spore proteins of Bacillus cereus, Bacillus stearothermophilus, and "Thermoactinomyces thalpophilus".

ABSTRACT

The nucleotide sequences of the single genes coding for the B-type small, acid-soluble spore proteins (SASP) of Bacillus cereus, B. stearothermophilus, and "Thermoactinomyces thalpophilus" were determined, and the amino acid sequences of all B-type SASP were compared. While this type of SASP showed significant sequence conservation around the two spore protease cleavage sites, alignment of these sequences required the introduction of gaps, and even then only 19 of the residues were conserved exactly in all five proteins. However, all five B-type SASP did contain a large (27 to 35-residue), rather well-conserved amino acid sequence repeat, and four of the five proteins had well-conserved regions of 14 to 17 amino acids which appeared three times.