RRC ID 3254
著者 Tamura N, Murata Y, Mukaihara T.
タイトル Isolation of Ralstonia solanacearum hrpB constitutive mutants and secretion analysis of hrpB-regulated gene products that share homology with known type III effectors and enzymes.
ジャーナル Microbiology (Reading, Engl.)
Abstract The Hrp type III secretion system (TTSS) is essential for the pathogenicity of the Gram-negative plant pathogen Ralstonia solanacearum. To examine the secretion of type III effector proteins via the Hrp TTSS, a screen was done of mutants constitutively expressing the hrpB gene, which encodes an AraC-type transcriptional activator for the hrp regulon. A mutant was isolated that in an hrp-inducing medium expresses several hrpB-regulated genes 4.9-83-fold higher than the wild-type. R. solanacearum Hrp-secreted outer proteins PopA and PopC were secreted at high levels into the culture supernatants of the hrpB constitutive (hrpB(c)) mutant. Using hrpB(c) mutants, the extracellular secretion of several hrpB-regulated (hpx) gene products that share homology with known type III effectors and enzymes was examined. Hpx23, Hpx24 and Hpx25, which are similar in sequence to Pseudomonas syringae pv. tomato effector proteins HopPtoA1, HolPtoR and HopPtoD1, are also secreted via the Hrp TTSS in R. solanacearum. The secretion of two hpx 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 R. solanacearum.
巻・号 151(Pt 9)
ページ 2873-84
公開日 2005-9
DOI 10.1099/mic.0.28161-0
PII 151/9/2873
PMID 16151200
MeSH Bacterial Proteins / chemistry Bacterial Proteins / genetics Bacterial Proteins / isolation & purification* Bacterial Proteins / metabolism DNA-Binding Proteins / chemistry DNA-Binding Proteins / genetics DNA-Binding Proteins / isolation & purification* DNA-Binding Proteins / metabolism Pseudomonas / physiology Ralstonia solanacearum / genetics Ralstonia solanacearum / metabolism Ralstonia solanacearum / physiology* Transcription Factors / chemistry Transcription Factors / genetics Transcription Factors / isolation & purification* Transcription Factors / metabolism
IF 2.151
引用数 18
原核生物(大腸菌) CV-41(JM109) CV-61(S17-1)