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type III secretion system co-regulatory protein PtrC PtrC (Pseudomonas type III repressor gene C), represented by locus PA2486 in Pseudomonas aeruginosa PAO1, is a small protein, typically around 64 amino acids, rich in charged residues. Overexpression represses T3SS expression, although the mechanism is not described and may depend on protein-protein interaction rather than direct interaction with DNA.
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