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During DNA microarray analysis, we discovered that the GlnK-GlnL (formerly YcbA-YcbB) two-component system positively regulates the expression of the glsA-glnT (formerly ybgJ-ybgH) operon in response to glutamine in the culture medium on Northern analysis. As a result of gel retardation and DNase I footprinting analyses, we found that the GlnL protein interacts with a region (bases -13 to -56; +1 is the transcription initiation base determined on primer extension analysis of glsA-glnT) in which a direct repeat, TTTTGTN4TTTTGT, is present. Furthermore, the glsA and glnT genes were biochemically verified to encode glutaminase and glutamine transporter, respectively.

Enhancement of Glutamine Utilization in Bacillus subtilis through the GlnK-GlnL Two-Component Regulatory System