Versatile and Features of Secretion Systems from Pathogenic Bacteria Ralstonia solanacearum

Abstract:

Hundreds of proteins are secreted extracellularly in Ralstonia solanacearum through several specialized protein secretion systems. Key factors to pathogenicity are the type Ⅱ and type Ⅲ secretion systems, both of which are able to export large repertoires of pathogenicity effectors with distinct mechanism. The type Ⅲ secretion system play an important role in host plant recognition as well as in bacteria proliferation, the whole process depend on host microbe interaction and recognition, however, it is Sec signal transduction pathway independent. To date, two groups of type Ⅲ secretion system effectors with host plant targets, named Pop2 and Gala family proteins, have been identified in R. solanacearum strain GMI1000. This review mainly focus on the secretion systems of R. solanacearum and the interaction between host plant target and the type Ⅲ effectors proteins such as Pop2 and Gala family proteins.

Key words:Ralstonia solanacearum, Effector, Virulence, Sec pathway