CsgD is a transcription and response regulator protein referenced to as the master modulator of bacterial biofilm development. In E. coli cells, CsgD is tasked with aiding the transition from planktonic cell motility to the stationary phase of biofilm formation, in response to environmental growth factors. A transcription analysis assay (happening in vitro) illustrated a heightened decrease in CsgD's DNA-binding capacity when phosphorylated at A.A. D59 of the protein's primary sequence. Therefore, in the protein's active form (unphosphorylated), CsgD is capable of carrying out its normal functions of regulating curli proteins (fimbria) and producing ECM polysaccharides (cellulose). Following a promoter-lacZ fusion assay of CsgD binding to specific target sites on E. coli's genome, two clas
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