1887

Abstract

The Hrp type III secretion system (TTSS) is essential for the pathogenicity of on host plants. Hrp TTSS is a specialized secretion system that injects virulence proteins, the so-called type III effector proteins, into plant cells. In , the expression of Hrp TTSS-related genes is regulated by an AraC-type transcriptional activator, HrpB. We have identified 30 -regulated (-dependent epression) genes and three well-known -regulated genes, , and , as candidate effector genes in strain RS1000. In this study, we newly cloned 11 additional candidate effector genes that share homology with known genes from RS1000. Using a Cya reporter system, we investigated the translocation of these 44 gene products into plant cells via the Hrp TTSS and identified 34 effector proteins. These include three effector families composed of more than four members, namely the Hpx4, Hpx30 and GALA families. The Hpx30 family effectors are 2200–2500 aa in size and appear to be the largest class of effector proteins among animal- and plant-pathogenic bacteria. Members of this family contain 12–18 tandem repeats of a novel 42 aa motif, designated SKWP repeats.

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2009-07-01
2020-07-11
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