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Updated: Feb 13, 2026

Describing a Transcription Factor Dependent Regulation of the MicroRNA Transcriptome
Published on: June 15, 2016
D-fining DarR: a LysR-type transcriptional regulator that responds to D-aspartate
1Department of Medical Microbiology and Immunology, University of Wisconsin-Madison, Madison, WI USA mmandel@wisc.edu.
Abstract:
Work from Jones, Stabb, et al. describes a D-aspartate sensing system in Proteobacteria. D-amino acids are critical components of peptidoglycan and other structures. The new study identifies the LysR-type transcriptional regulator, DarR, which activates the aspartate racemase RacD. Overexpression of RacD enables it to synthesize D-glutamate and restore normal peptidoglycan in a Vibrio fischeri murI mutant. This study contributes to emerging roles for D-amino acids and how they are synthesized under distinct conditions.
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