Abstract
The sgp gene from Streptococcus mutans has been previously isolated, characterized, and demonstrated to encode a G-protein. In order to investigate the function of this gene, a novel antisense RNA strategy was developed. Expression of sgp antisense RNA in Escherichia coli led to transient inhibition of growth. In addition, sgp antisense RNA expression in S. mutans resulted in decreased growth under environmental stress conditions (44°C, acidic pH, and high osmolarity). Therefore, these results suggest that the sgp gene plays a role in modulating the stress responses of S. mutans. This approach could be applicable for investigating the function of essential genes in other organisms for which mutants are not available.
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