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A Putative phospholipase C is involved in Pichia fermentans dimorphic transition

Sanna, Maria Lina and Zara, Giacomo and Zara, Severino and Migheli, Quirico and Budroni, Marilena and Mannazzu, Ilaria Maria (2014) A Putative phospholipase C is involved in Pichia fermentans dimorphic transition. Biochimica et Biophysica Acta. General Subjects, Vol. 1840 (1), p. 344-349. ISSN 0304-4165. eISSN 1872-8006. Article.

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DOI: 10.1016/j.bbagen.2013.09.030


Background: Pichia fermentans DiSAABA 726 is a dimorphic yeast that reversibly shifts from yeast-like to pseudohyphal morphology. This yeast behaves as a promising antagonist of Monilia spp. in the yeast-like form, but becomes a destructive plant pathogen in the pseudohyphal form thus raising the problem of the biological risk associated with the use of dimorphic yeasts as microbial antagonists in the biocontrol of phytopathogenic fungi.
Methods: Pichia fermentans DiSAABA 726 was grown in urea- and methionine-containing media in order to induce and separate yeast-like and pseudohyphal morphologies. Total RNA was extracted from yeast-like cells and pseudohyphae and retro-transcribed into cDNA. A rapid subtraction hybridization approach was utilized to obtain the cDNA sequences putatively over-expressed during growth on methionine-containing medium and involved in pseudohyphal transition.
Results: Five genes that are over-expressed during yeast-like/pseudohyphal dimorphic transition were isolated. One of these, encoding a putative phospholipase C, is involved in P. fermentans filamentation. In fact, while the inhibition of phospholipase C, by means of 1-O-octadecyl-2-O-methyl-rac-glycero-3-phosphorylcholine (Et-18), is accompanied by a significant reduction of pseudohyphae formation in P. fermentans, the addition of exogenous cAMP fully restores pseudohyphal growth also in the presence of Et-18.
Conclusion: Phospholipase C is part of a putative "methionine sensing machinery" that activates cAMP-PKA signal transduction pathway and controls P. fermentans yeast-like/pseudohyphal dimorphic transition.
General significance: Phospholipase C is a promising molecular target for further investigations into the link between pseudohyphae formation and pathogenicity in P. fermentans.

Item Type:Article
ID Code:9576
Uncontrolled Keywords:Dimorphic shift, Phospholipase C, Pichia fermentans, Rapid subtraction hybridization (RaSH), 3′-5′-cyclic adenosine monophosphate (cAMP), Pseudohypha
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/12 Patologia vegetale
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Agraria
002 Altri enti e centri di ricerca del Nord Sardegna > Istituto nazionale biostrutture e biosistemi, Unità di ricerca, Sassari
Deposited On:16 Jan 2014 09:41

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