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Elsevier BV Journal of Biological Chemistry 300(3)
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    초록·키워드

    The NifLA two component system is responsible for the regulation of nitrogenase production in Azotobacter vinelandii, but the full mechanism of the regulation is not understood. NifL acts as a sensory protein and responds to oxygen presence, energy status, and fixed nitrogen levels, and NifA is the transcriptional activator of the nif genes. The formation of the NifL-NifA complex prevents NifA from activating transcription and preventing nitrogenase production. Oxygen presence is detected by the N-terminal PAS domain, and the energy status is determined by ADP/ATP binding in the C-terminal domain. Conformational changes of NifL based on oxygen presence and energy status have been identified using low resolution structural determination methods. Fixed nitrogen levels are identified indirectly by interactions with GlnK. GlnK is reversibly uridylylated when fixed nitrogen levels are low, and this uridylylation prevents interactions with the C-terminal domain of NifL. It is unknown how the conformation of NifL is impacted by the interaction with GlnK, but it is known that the formation of the GlnK-NifL complex stimulates NifA binding. This poster will discuss the conformations of NifL in response to sensing various cellular conditions and how these conformations affect complex formation and ultimately nif gene expression.

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