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Identification of intracellular amylase activity in Streptococcus bovis and Streptococcus salivarius

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Abstract

The ruminal bacterium Streptococcus bovis has been demonstrated to produce an extracellular amylase activity. We previously reported on the cloning of a gene from S. bovis encoding for what was initially believed to be the extracellular amylase. DNA sequence analyses indicated that the amylase produced by the cloned gene did not match the N-terminus amino acid sequence of the purified extracellular amylase and contained no apparent leader sequence for secretion. Analyses of crude extracts demonstrated the presence of an intracellular amylase in S. bovis JB1 that differed in molecular weight (56,000) from that of the extracellular amylase (70,000). The 56,000 molecular weight amylase was identical to the amylase produced by Escherichia coli containing the cloned amylase gene. Low levels of intracellular amylase activity were also detected in other strains of S. bovis and also Streptococcus salivarius. Introduction of the plasmid pVA838 containing the cloned amylase gene into S. bovis and S. sanguis resulted in enhanced intracellular amylase production by both organisms. The amylase gene has been sequenced, and analysis of the deduced amino acid sequence for the amylase indicates a high degree of similarity with secreted amylases from Bacillus species.

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  1. Fermentation Biochemistry Research Unit, National Center for Agricultural Utilization Research, U.S. Department of Agriculture, Agricultural Research Service, 1815 N. University Street, 61604, Peoria, IL, USA

    Terence R. Whitehead & Michael A. Cotta

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  1. Terence R. Whitehead
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  2. Michael A. Cotta
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Names are necessary to report factually on available data; however, the USDA neither guarantees nor warrants the standard of the product, and the use of the name by USDA implies no approval of the product to the exclusion of others that may also be suitable.

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Whitehead, T.R., Cotta, M.A. Identification of intracellular amylase activity in Streptococcus bovis and Streptococcus salivarius . Current Microbiology 30, 143–148 (1995). https://doi.org/10.1007/BF00296199

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