Synthesis, conformational analysis and biological properties of a dicarba derivative of the antimicrobial peptide, brevinin-1BYa. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Biophysics of structure and mechanism Année : 2011

Synthesis, conformational analysis and biological properties of a dicarba derivative of the antimicrobial peptide, brevinin-1BYa.

Mohammed Akhter Hossain
  • Fonction : Auteur
Agnes Sonnevend
  • Fonction : Auteur
Samir Attoub
  • Fonction : Auteur
Bianca J van Lierop
  • Fonction : Auteur
Andrea J Robinson
  • Fonction : Auteur
John D Wade
  • Fonction : Auteur

Résumé

Brevinin-1BYa (FLPILASLAAKFGPKLFCLVTKKC), first isolated from skin secretions of the frog Rana boylii, displays broad-spectrum antimicrobial activity and potent haemolytic activity. This study investigates the effects on conformation and biological activity of replacement of the intramolecular disulphide bridge in the peptide by a non-reducible dicarba bond. Dicarba-brevinin-1BYa was prepared by microwave irradiation of [Agl(18),Agl(24)]-brevinin-1BYa (Agl = allylglycine) in the presence of a second generation Grubbs' catalyst. Circular dichroism spectroscopy in 50% trifluoroethanol-water indicated that the degree of α-helicity of the dicarba derivative (22%) was less than that of brevinin-1BYa (27%) but comparable to that of the acyclic derivative [Ser(18),Ser(24)]-brevinin-1BYa (23%). Dicarba-brevinin-1BYa showed a two-fold increase in potency against reference strains of Escherichia coli, Staphylococcus aureus, and Candida albicans compared with the native peptide and displayed potent bactericidal activity against clinical isolates of methicillin-resistant S. aureus (MRSA) and multidrug-resistant Acinetobacter baumannii (MIC in the range 1-8 μM). Compared with brevinin-1BYa and [Ser(18),Ser(24)]-brevinin-1BYa, the dicarba derivative was associated with increased cytotoxicity against human erythrocytes (2.5-fold), MDA-MB-231 breast carcinoma cells (1.3-fold) and HepG2 hepatoma-derived cells (1.5-fold).

Domaines

Chimie organique

Dates et versions

hal-00991618 , version 1 (15-05-2014)

Identifiants

Citer

Mohammed Akhter Hossain, Laure Guilhaudis, Agnes Sonnevend, Samir Attoub, Bianca J van Lierop, et al.. Synthesis, conformational analysis and biological properties of a dicarba derivative of the antimicrobial peptide, brevinin-1BYa.. Biophysics of structure and mechanism, 2011, 40 (4), pp.555-564. ⟨10.1007/s00249-011-0679-2⟩. ⟨hal-00991618⟩
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