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To adapt to changing environmental niches, bacteria require taxis, a movement toward or away from a stimulus (ligand). Chemotaxis has been studied in some members of the Soft Rot Pectobacteriaceae (SRP), particularly members of the genus  Dickeya . On the contrary, there are fewer studies on this topic for the other genus in the SRP group, namely  Pectobacterium . This study evaluated chemotactic responses in  Pectobacterium brasiliense  ( Pb 1692 ) to various ligands. A total of 34 methyl-accepting chemotactic proteins (MCPs) were identified in the  Pb 1692  genome and the domain architectures of these MCPs were determined. Four  Pb 1692  MCPs previously shown to be differentially expressed during potato tuber infection were selected for further functional characterization. Toward this end,  Pb 1692  mutant strains each lacking either  AED-0001492 ,  AED-0003671 ,  AED-0000304 , or  AED-0000744  were generated. Two of these mutants ( AED-0001492  and  AED-0003671 ), were attenuated in their ability to grow and respond to citrate and are thus referred to as  MCP  cit2   and MCP  cit1   , respectively, while the other two,  AED-0000304  ( MCP   xyl  ) and  AED-0000744  ( MCP   asp  ), were affected in their ability to respond to xylose and aspartate, respectively. Trans-complementation of the mutant strains restored swimming motility in the presence of respective ligands. The four MCP mutants were not affected in virulence but were significantly attenuated in their ability to attach to potato leaves suggesting that ecological fitness is an important contribution of these MCPs toward  Pb 1692  biology.

Pectobacterium brasiliense 1692 Chemotactic Responses and the Role of Methyl-Accepting Chemotactic Proteins in Ecological Fitness