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1. An AraC-like transcriptional activator is required for induction of genes needed for alpha-galactoside utilization in Sinorhizobium meliloti.

Author

Bringhurst RM and Gage DJ

Subjects
Alkaline Phosphatase metabolism, Amino Acid Sequence, AraC Transcription Factor, Culture Media, Molecular Sequence Data, Mutation, Phenotype, Repressor Proteins chemistry, Repressor Proteins metabolism, Sequence Analysis, DNA, Symbiosis, Trans-Activators chemistry, Trans-Activators metabolism, Bacterial Proteins, Galactosides metabolism, Gene Expression Regulation, Bacterial, Sinorhizobium meliloti genetics, Sinorhizobium meliloti metabolism, Trans-Activators genetics, Transcription Factors
Abstract

The nodulating bacterium Sinorhizobium meliloti can utilize alpha-galactosides like melibiose and raffinose as sole sources of carbon and energy. We show that this utilization requires an AraC-like transcriptional activator, AgpT. When agpT was inactivated, Rhizobium meliloti could not utilize alpha-galactosides or induce genes required for transport and catabolism of these sugars. The agpT gene was not essential for the establishment of an effective nitrogen-fixing symbiosis.

Published
2000
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