期刊
MOLECULAR PLANT-MICROBE INTERACTIONS
卷 22, 期 1, 页码 18-30出版社
AMER PHYTOPATHOLOGICAL SOC
DOI: 10.1094/MPMI-22-1-0018
关键词
insect vector; leafhopper; mollicute; sec-dependent secretion; virulence protein
资金
- OSU-OARDC Research Enhancement Competitive Grant [2001-052]
- Marie Curie International Reintegration Grant [MIRG-14-CT-2007-046570]
- OSU- OARDC Research Enhancement Competitive Grant [2003-170]
- Gatsby Charitable Foundation
- Biotechnology and Biological Sciences Research Council [BBS/E/J/000C0623] Funding Source: researchfish
- BBSRC [BBS/E/J/000C0623] Funding Source: UKRI
The fully sequenced genome of aster yellows phytoplasma strain witches' broom (AY-WB; Candidatus Phytoplasma asteris) was mined for the presence of genes encoding secreted proteins based on the presence of N-terminal signal peptides (SP). We identified 56 secreted AY-WB proteins (SAP). These SAP are candidate effector proteins potentially involved in interaction with plant and insect cell components. One of these SAP, SAP11, contains an N-terminal SP sequence and a eukaryotic bipartite nuclear localization signal (NLS). Transcripts for SAP11 were detected in AY-WB-infected plants. Yellow fluorescence protein (YFP)-tagged SAP11 accumulated in Nicotiana benthamiana cell nuclei, whereas the nuclear targeting of YFP-tagged SAP11 mutants with disrupted NLS was inhibited. The nuclear transport of YFP-SAP11 was also inhibited in N. benthamiana plants in which the expression of importin alpha was knocked down using virus-induced gene silencing (VIGS). Furthermore, SAP11 was detected by immunocytology in nuclei of young sink tissues of China aster plants infected with AY-WB. In summary, this work shows that AY-WB phytoplasma produces a protein that targets the nuclei of plant host cells; this protein is a potential phytoplasma effector that may alter plant cell physiology.
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