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As found previously with other Bacillus species, spores of B. stearothermophilus and "Thermoactinomyces thalpophilus" contained significant levels of small, acid-soluble spore proteins (SASP) which were rapidly degraded during spore germination and which reacted with antibodies raised against B. megaterium SASP. Genes coding for a B. stearothermophilus and a "T. thalpophilus" SASP as well as for two B. cereus SASP were cloned, their nucleotide sequences were determined, and the amino acid sequences of the SASP coded for were compared. Strikingly, all of the amino acid residues previously found to be conserved in this group of SASP both within and between two other Bacillus species (B. megaterium and B. subtilis) were also conserved in the SASP coded for by the B. cereus genes as well as those coded for by the genes from the more distantly related organisms B. stearothermophilus and "T. thalpophilus." This finding strongly suggests that there is significant selective pressure to conserve SASP primary sequence and thus that these proteins serve some function other than simply amino acid storage.

journal of bacteriology

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