Phytophthora phospholipase D genes and their role in plant cell degradation

Research output: Chapter in Book/Report/Conference proceedingAbstract

Abstract

Plant pathogens secrete a large repertoire of proteins that may have a role in pathogenicity such as modulation of host defense (e.g. effectors) or degradation of host tissue. Phytophthora infestans, the potato late blight pathogen, possesses genes encoding secreted proteins with a phospholipase D (PLD) catalytic domain and this suggests that the Phytophthora secretome comprises this class of enzymes. PLD catalyzes the hydrolysis of membrane phospholipids leading to the production of phosphatidic acid and a free headgroup. Phosphatidic acid is a key player in the arena of cellular signalling. It is involved in many processes, including G-protein regulation, protein phosphorylation, transcription, cell proliferation and growth. PLD activity and phosphatidic acid production in plants is also correlated with membrane degradation during senescence and wounding. Phytophthora infestans, has 18 genes encoding PLDs. One PLD is a universal PLD that is present in all eukaryotes. A second one has homology to a novel class of PLD(-like) proteins. The other sixteen, divided over 4 subfamilies, are more diverged from known PLDs in eukaryotes and unique for Phytophthora. Two of these sub-families are small, secreted proteins. We detected PLD activity in exudates of Phytophthora and showed that these exudates are capable of degrading lipid vesicles. Transient in planta expression of the genes encoding secreted PLDs resulted in a calcium dependent induction of cell death responses. This could point to a function in host membrane modification and/or egradation.
Original languageEnglish
Title of host publicationBook of Abstracts 8th Oomycete Molecular Genetics Network Meeting, Pacific Grove, California, USA, 15-17 March 2009
Pages19
Publication statusPublished - 2009
EventOomycete Molecular Genetics Network meeting 2009 - Pacific Grove, United States
Duration: 15 Mar 200917 Mar 2009

Conference

ConferenceOomycete Molecular Genetics Network meeting 2009
CountryUnited States
CityPacific Grove
Period15/03/0917/03/09

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