Revealing the properties of plant defensins through dynamics

Defensins are potent, ancient natural antibiotics that are present in organisms ranging from lower organisms to humans. Although the structures of several defensins have been well characterized, the dynamics of only a few have been studied. This review discusses the diverse dynamics of two plant def...

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Bibliographic Details
Published in:Molecules 2013-09, Vol.18 (9), p.11311-11326
Main Authors: Valente, Ana Paula, de Paula, Viviane Silva, Almeida, Fabio C L
Format: Article
Language:English
Subjects:
Amino Acid Sequence
Animals
Cell Membrane
defensins
Defensins - chemistry
Defensins - physiology
Disease Resistance
dynamics
Humans
membrane recognition
Molecular Sequence Data
NMR
Plant Proteins - chemistry
Plant Proteins - physiology
Protein Conformation
Review
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Summary:Defensins are potent, ancient natural antibiotics that are present in organisms ranging from lower organisms to humans. Although the structures of several defensins have been well characterized, the dynamics of only a few have been studied. This review discusses the diverse dynamics of two plant defensins for which the structure and dynamics have been characterized, both in the free state and in the presence of target membranes. Multiple motions are observed in loops and in secondary structure elements and may be related to twisting or breathing of the α-helix and β-sheet. This complex behavior is altered in the presence of an interface and is responsive to the presence of the putative target. The stages of membrane recognition and disruption can be mapped over a large time scale range, demonstrating that defensins in solution exist as an ensemble of different conformations, a subset of which is selected upon membrane binding. Therefore, studies on the dynamics have revealed that defensins interact with membranes through a mechanism of conformational selection.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules180911311