Novel defensin subfamily from spinach (Spinacia oleracea)

Segura, Ana and Moreno, Manuel and Molina Fernández, Antonio and García Olmedo, Francisco (1998). Novel defensin subfamily from spinach (Spinacia oleracea). "Febs Letters", v. 435 (n. 2-3); pp. 159-162. ISSN 0014-5793. https://doi.org/10.1016/S0014-5793(98)01060-6.

Description

Title: Novel defensin subfamily from spinach (Spinacia oleracea)
Author/s:
  • Segura, Ana
  • Moreno, Manuel
  • Molina Fernández, Antonio
  • García Olmedo, Francisco
Item Type: Article
Título de Revista/Publicación: Febs Letters
Date: September 1998
ISSN: 0014-5793
Volume: 435
Subjects:
Freetext Keywords: Antimicrobial peptide; Innate immunity; Plant defense; Plant defensin; Plant pathogen; Spinach
Faculty: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Department: Biotecnologia [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Antimicrobial peptides (So-D1-7) were isolated from a crude cell wall preparation from spinach leaves (Spinacia oleracea cv. Matador) and, judged from their amino acid sequences, six of them (So-D2-7) represented a novel structural subfamily of plant defensins (group IV). Group-IV defensins were also functionally distinct from those of groups I–III. They were active at concentrations <20 μM against Gram-positive (Clavibacter michiganensis) and Gram-negative (Ralstonia solanacearum) bacterial pathogens, as well as against fungi, such as Fusarium culmorum, F. solani, Bipolaris maydis, and Colletotrichum lagenarium. Fungal inhibition occurred without hyphal branching. Group-IV defensins were preferentially distributed in the epidermal cell layer of leaves and in the subepidermal region of stems.

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