1887

Abstract

The Hrp type III secretion system (TTSS) is essential for the pathogenicity of the Gram-negative plant pathogen . To examine the secretion of type III effector proteins via the Hrp TTSS, a screen was done of mutants constitutively expressing the gene, which encodes an AraC-type transcriptional activator for the regulon. A mutant was isolated that in an -inducing medium expresses several -regulated genes 4·9–83-fold higher than the wild-type. Hrp-secreted outer proteins PopA and PopC were secreted at high levels into the culture supernatants of the constitutive ( ) mutant. Using mutants, the extracellular secretion of several -regulated () gene products that share homology with known type III effectors and enzymes was examined. Hpx23, Hpx24 and Hpx25, which are similar in sequence to pv. effector proteins HopPtoA1, HolPtoR and HopPtoD1, are also secreted via the Hrp TTSS in . The secretion of two gene products that share homology with known enzymes, glyoxalase I (Hpx19) and Nudix hydrolase (Hpx26), was also examined. Hpx19 is accumulated inside the cell, but interestingly, Hpx26 is secreted outside the cell as an Hrp-secreted outer protein, suggesting that Hpx19 functions intracellularly but Hpx26 is a novel effector protein of .

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2005-09-01
2019-10-14
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