Location of the α-amylase gene in rumenStreptococcus bovis strains distinguished by unstable amylase activity

Abstract
Genetic stability of amylase activity after serial subcultivation experiments with amylolytic ruminalStreptococcus bovis strains was investigated. Two strains Amy+ and Amy were obtained. Loss of amylase activity connected with the loss of plasmid DNA was not found in these strains. The presence of the gene responible for the amylase activity in the chromosome of these strains was revealed by hybridization of the α-amylase gene on pJK108 against chromosomal DNA ofS. bovis andBacillus subtilis after a complete restriction withEcoRI.

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