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Arabidopsis YELLOW STRIPE-LIKE7 (YSL7) and YSL8 transporters mediate uptake of pseudomonas virulence factor syringolin A into plant cells


Hofstetter, Silvia Schelbert; Dudnik, Alexey; Widmer, Heidi; Dudler, Robert (2013). Arabidopsis YELLOW STRIPE-LIKE7 (YSL7) and YSL8 transporters mediate uptake of pseudomonas virulence factor syringolin A into plant cells. Molecular Plant-Microbe Interactions, 26(11):1302-1311.

Abstract

Syringolin A (SylA), a virulence factor secreted by certain strains of the plant pathogen Pseudomonas syringae pv. syringae, is an irreversible proteasome inhibitor imported by plant cells by an unknown transport process. Here, we report that functional expression in yeast of all 17 members of the Arabidopsis oligopeptide transporter family revealed that OLIGOPEPTIDE TRANSPORTER1 (OPT1), OPT2, YELLOW STRIPE-LIKE3 (YSL3), YSL7, and YSL8 rendered yeast cells sensitive to growth inhibition by SylA to different degrees, strongly indicating that these proteins mediated SylA uptake into yeast cells. The greatest SylA sensitivity was conferred by YSL7 and YSL8 expression. An Arabidopsis ysl7 mutant exhibited strongly reduced SylA sensitivity in a root growth inhibition assay and in leaves of ysl7 and ysl8 mutants, SylA-mediated quenching of salicylic-acid-triggered PATHOGENESIS-RELATED GENE1 transcript accumulation was greatly reduced compared with the wild type. These results suggest that YSL7 and YSL8 are major SylA uptake transporters in Arabidopsis. Expression of a YSL homolog of bean, the host of the SylA-producing P. syringae pv. syringae B728a, in yeast also conferred strong SylA sensitivity. Thus, YSL transporters, which are thought to be involved in metal homeostasis, have been hijacked by bacterial pathogens for SylA uptake into host cells.

Abstract

Syringolin A (SylA), a virulence factor secreted by certain strains of the plant pathogen Pseudomonas syringae pv. syringae, is an irreversible proteasome inhibitor imported by plant cells by an unknown transport process. Here, we report that functional expression in yeast of all 17 members of the Arabidopsis oligopeptide transporter family revealed that OLIGOPEPTIDE TRANSPORTER1 (OPT1), OPT2, YELLOW STRIPE-LIKE3 (YSL3), YSL7, and YSL8 rendered yeast cells sensitive to growth inhibition by SylA to different degrees, strongly indicating that these proteins mediated SylA uptake into yeast cells. The greatest SylA sensitivity was conferred by YSL7 and YSL8 expression. An Arabidopsis ysl7 mutant exhibited strongly reduced SylA sensitivity in a root growth inhibition assay and in leaves of ysl7 and ysl8 mutants, SylA-mediated quenching of salicylic-acid-triggered PATHOGENESIS-RELATED GENE1 transcript accumulation was greatly reduced compared with the wild type. These results suggest that YSL7 and YSL8 are major SylA uptake transporters in Arabidopsis. Expression of a YSL homolog of bean, the host of the SylA-producing P. syringae pv. syringae B728a, in yeast also conferred strong SylA sensitivity. Thus, YSL transporters, which are thought to be involved in metal homeostasis, have been hijacked by bacterial pathogens for SylA uptake into host cells.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Plant and Microbial Biology
Dewey Decimal Classification:580 Plants (Botany)
Language:English
Date:2013
Deposited On:04 Nov 2013 12:28
Last Modified:05 Apr 2016 17:05
Publisher:American Phytopathological Society
ISSN:0894-0282
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1094/MPMI-06-13-0163-R
PubMed ID:23945001

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