Characterization of two novel defense peptides from pea (Pisum sativum) seeds.
Arch Biochem Biophys
; 378(2): 278-86, 2000 Jun 15.
Article
em En
| MEDLINE
| ID: mdl-10860545
ABSTRACT
A fraction that possesses antifungal activity against Aspergillus niger has been isolated from seeds of the pea (Pisum sativum) by ammonium sulfate fractionation followed by gel filtration on Sephadex G-75. On further purification by reverse-phase high performance liquid chromatography, two small cysteine-rich polypeptides were obtained (Psd1 and Psd2). They are localized primarily in vascular bundles and epidermis tissues of pea pods and exhibit high antifungal activity toward several fungi, displaying IC(50) values ranging from 0.04 to 22 microg/ml. This inhibitory activity decreases when A. niger growth medium is supplemented with cations such as Ca(2+), Mg(2+), Na(+), and K(+). Although the primary sequence of both Psd1 and Psd2 shows homology with other plant defensins, they cannot easily be assigned to any established group.
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Coleções:
01-internacional
Temas:
Geral
Base de dados:
MEDLINE
Assunto principal:
Peptídeos
/
Proteínas de Plantas
/
Proteínas
/
Pisum sativum
Idioma:
En
Revista:
Arch Biochem Biophys
Ano de publicação:
2000
Tipo de documento:
Article
País de afiliação:
Brasil