Pseudomonas syringae Hrp type III secretion system and effector proteins

Alan Collmer, Jorge L. Badel, Amy O. Charkowski, Wen Ling Deng, Derrick E. Fouts, Adela R. Ramos, Amos H. Rehm, Deborah M. Anderson, Olaf Schneewind, Karin Van Dijk, James R. Alfano

Research output: Contribution to journalArticle

155 Citations (Scopus)

Abstract

Pseudomonas syringae is a member of an important group of Gram-negative bacterial pathogens of plants and animals that depend on a type III secretion system to inject virulence effector proteins into host cells. In P. syringae, hrp/hrc genes encode the Hrp (type III secretion) system, and avirulence (avr) and Hrp-dependent outer protein (hop) genes encode effector proteins. The hrp/hrc genes of P. syringae pv syringae 61, P. syringae pv syringae B728a, and P. syringae pv tomato DC3000 are flanked by an exchangeable effector locus and a conserved effector locus in a tripartite mosaic Hrp pathogenicity island (Pai) that is linked to a tRNA(Leu) gene found also in Pseudomonas aeruginosa but without linkage to Hrp system genes. Cosmid pHIR11 carries a portion of the strain 61 Hrp pathogenicity island that is sufficient to direct Escherichia coli and Pseudomonas fluorescens to inject HopPsyA into tobacco cells, thereby eliciting a hypersensitive response normally triggered only by plant pathogens. Large deletions in strain DC3000 revealed that the conserved effector locus is essential for pathogenicity but the exchangeable effector locus has only a minor role in growth in tomato. P. syringae secretes HopPsyA and AvrPto in culture in a Hrp-dependent manner at pH and temperature conditions associated with pathogenesis. AvrPto is also secreted by Yersinia enterocolitica. The secretion of AvrPto depends on the first 15 codons, which are also sufficient to direct the secretion of an Npt reporter from Y. enterocolitica, indicating that a universal targeting signal is recognized by the type III secretion systems of both plant and animal pathogens.

Original languageEnglish (US)
Pages (from-to)8770-8777
Number of pages8
JournalProceedings of the National Academy of Sciences of the United States of America
Volume97
Issue number16
DOIs
StatePublished - Aug 1 2000

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Pseudomonas syringae
Genomic Islands
Yersinia enterocolitica
Proteins
Lycopersicon esculentum
Genes
Virulence
RNA, Transfer, Leu
Pseudomonas fluorescens
Cosmids
Codon
Pseudomonas aeruginosa
Tobacco
Type III Secretion Systems
Escherichia coli
Temperature
Growth

ASJC Scopus subject areas

  • General

Cite this

Pseudomonas syringae Hrp type III secretion system and effector proteins. / Collmer, Alan; Badel, Jorge L.; Charkowski, Amy O.; Deng, Wen Ling; Fouts, Derrick E.; Ramos, Adela R.; Rehm, Amos H.; Anderson, Deborah M.; Schneewind, Olaf; Van Dijk, Karin; Alfano, James R.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 97, No. 16, 01.08.2000, p. 8770-8777.

Research output: Contribution to journalArticle

Collmer, A, Badel, JL, Charkowski, AO, Deng, WL, Fouts, DE, Ramos, AR, Rehm, AH, Anderson, DM, Schneewind, O, Van Dijk, K & Alfano, JR 2000, 'Pseudomonas syringae Hrp type III secretion system and effector proteins', Proceedings of the National Academy of Sciences of the United States of America, vol. 97, no. 16, pp. 8770-8777. https://doi.org/10.1073/pnas.97.16.8770
Collmer, Alan ; Badel, Jorge L. ; Charkowski, Amy O. ; Deng, Wen Ling ; Fouts, Derrick E. ; Ramos, Adela R. ; Rehm, Amos H. ; Anderson, Deborah M. ; Schneewind, Olaf ; Van Dijk, Karin ; Alfano, James R. / Pseudomonas syringae Hrp type III secretion system and effector proteins. In: Proceedings of the National Academy of Sciences of the United States of America. 2000 ; Vol. 97, No. 16. pp. 8770-8777.
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