Cloning and characterization of the PDA6-1 gene encoding a fungal cytochrome P-450 which detoxifies the phytoalexin pisatin from garden pea

Détails

ID Serval
serval:BIB_781F2211C6A3
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Cloning and characterization of the PDA6-1 gene encoding a fungal cytochrome P-450 which detoxifies the phytoalexin pisatin from garden pea
Périodique
Gene
Auteur⸱e⸱s
Reimmann  C., VanEtten  H. D.
ISSN
0378-1119 (Print)
Statut éditorial
Publié
Date de publication
09/1994
Volume
146
Numéro
2
Pages
221-6
Notes
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S. --- Old month value: Sep 2
Résumé
The ability to detoxify pisatin, a phytoalexin produced by garden pea (Pisum sativum), is controlled by a family of PDA (pisatin demethylating ability) genes in the phytopathogenic fungus Nectria haematococa, MP (mating population) VI. Six known PDA genes each encode characteristic levels of inducible enzyme activity and are associated with different degrees of virulence on pea. To elucidate the phenotypic differences associated with these genes, we have cloned and characterized the PDA6-1 gene which encodes a pisatin-detoxifying enzyme and we compare it to another PDA gene, PDAT9. Pisatin demethylation was measured in PDA6-1 transformants of Aspergillus nidulans and shown to be regulated by glucose. The deduced amino acid (aa) sequence of PDA6-1 was 90% identical to that of the cytochrome P-450 encoded by PDAT9, but lacked nine aa at the C terminus, which has been postulated to be a site involved in substrate binding. A 35-bp sequence present upstream of a third PDA gene, PDA1, which appears to be important for induction of PDA1 by pisatin, was conserved in PDAT9, but not in PDA6-1. We conclude that PDA6-1, which does not appear to contribute to the virulence of N. haematococa on pea, differs significantly from PDAT9, which is associated with high virulence.
Mots-clé
Amino Acid Sequence Aspergillus nidulans/genetics Base Sequence Benzopyrans/*metabolism Cytochrome P-450 Enzyme System/chemistry/*genetics/physiology Fabaceae/metabolism/microbiology Fusarium/*genetics Genes, Fungal/*genetics Methylation Molecular Sequence Data Plants, Medicinal *Pterocarpans Sequence Alignment Transfection Transformation, Genetic
Pubmed
Web of science
Création de la notice
24/01/2008 14:00
Dernière modification de la notice
20/08/2019 14:34
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