The <i>hrp</i> gene locus of <i>Pseudomonas solanacearum</i>, which controls the production of a type III secretion system, encodes eight proteins related to components of the bacterial flagellar biogenesis complex

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<jats:title>Summary</jats:title><jats:p>Five transcription units of the Pseudomonas solanacearum <jats:italic>hrp</jats:italic> gene cluster are required for the secretion of the HR‐inducing PopA1 protein. The nucleotide sequences of two of these, units 1 and 3, have been reported. Here, we present the nucleotide sequence of the three other transcription units, units 2, 4 and 7, which are together predicted to code for 15 <jats:italic>hrp</jats:italic> genes. This brings the total number of Hrp proteins encoded by these five transcription units to 20, including HrpB, the positive regulatory protein, and HpaP, which is apparently not required for plant interactions., Among the 18 other proteins, eight belong to protein families regrouping proteins involved in type III secretion pathways in animal and plant bacterial pathogens and in flagellum biogenesis, while two are related solely to proteins involved in secretion systems. For the various proteins found to be related to <jats:italic>P. solanacearum</jats:italic> Hrp proteins, those in plant‐pathogenic bacteria include proteins encoded by <jats:italic>hrp</jats:italic> genes. For Hrp‐related proteins of animal pathogens, those encoded by the <jats:italic>spa</jats:italic> and <jats:italic>mxi</jats:italic> genes of <jats:italic>Shigella flexneri</jats:italic> and of <jats:italic>Salmonella typhimurium</jats:italic> and by the <jats:italic>ysc</jats:italic> genes of <jats:italic>Yersinia</jats:italic> are involved in type III secretion pathways. Proteins involved in flagellum biogenesis, which are related to Hrp proteins of <jats:italic>P. solanacearum</jats:italic>, include proteins encoded by <jats:italic>fli</jats:italic> and <jats:italic>fli</jats:italic> genes of <jats:italic>S. typhimurium, Bacillus subtils</jats:italic> and <jats:italic>Escherichia coli</jats:italic> and by <jats:italic>mop</jats:italic> genes of <jats:italic>Erwinia carotovora. P. solanacearum</jats:italic> Hrp proteins were also found to be related to proteins of <jats:italic>Rhizobium fredii</jats:italic> involved in nodulation specificity.</jats:p>

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