Document Detail


Inducing toxicity by introducing a leucine zipper like motif in frog antimicrobial peptide, magainin 2.
MedLine Citation:
PMID:  21434868     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Cytotoxicity, a major obstacle in therapeutic application of antimicrobial peptides, is controlled by leucine zipper like sequences in melittin and other naturally-occurring antimicrobial peptides. Magainin 2 shows significantly lower cytotoxicity than many naturally-occurring antimicrobial peptides and lacks this structural element. To investigate the consequences of introducing a leucine zipper sequence in magainin 2, a novel analogue (Mag-mut) was designed by rearranging only the positions of its hydrophobic amino acids to include this structural element. Both magainin 2 and Mag-mut showed appreciable similarities in their secondary structures in presence of negatively charged lipid vesicles, in localizing and permeabilizing the selected bacteria and exhibiting bactericidal activities. However, Mag-mut bound and localized strongly onto the tested mammalian cells and exhibited significantly higher cytotoxicity than magainin 2. Only Mag-mut but not magainin 2 permeabilized human red blood cells and zwitterionic lipid vesicles. In contrast to magainin 2, Mag-mut self-assembled in aqueous environment and bound cooperatively onto zwitterionic lipid vesicles. The peptides formed pores of different sizes onto a selected mammalian cell. The results indicated an important role of leucine zipper sequence in cytotoxicity of magainin 2-analogue and demonstrated that its introduction into a non-toxic peptide without altering the amino acid composition can render cytotoxicity.
Authors:
Brijesh Kumar Pandey; Saurabh Srivastava; Manish Singh; Jimut Kanti Ghosh
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-3-25
Journal Detail:
Title:  The Biochemical journal     Volume:  -     ISSN:  1470-8728     ISO Abbreviation:  -     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-3-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2984726R     Medline TA:  Biochem J     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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