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Structure-activity relationships of anti-HIV-1 peptides with disulfide linkage between D- and L-cysteine at positions i and i+3, respectively, derived from HIV-1 gp41 C-peptide
Experimental & Molecular Medicine ; : 18-26, 2006.
Article in English | WPRIM | ID: wpr-77905
ABSTRACT
The constrained alpha-helical structure of a C-peptide is useful for enhancing anti-HIV-1 activity. The i and i+3 positions in an alpha-helical structure are located close together, therefore D-Cys (dC) and L-Cys (C) were introduced at the positions, respectively, to make a dC-C disulfide bond in 28mer C-peptides. Accordingly, this study tested whether a dC-C disulfide bond would increase the alpha-helicity and anti-HIV-1 activity of peptides. A C-peptide can be divided into three domains, the N-terminal hydrophobic domain (HPD), middle interface domain (IFD), and C-terminal hydrogen domain (HGD), based on the binding property with an N-peptide. In general, the dC-C modifications in HPD enhanced the anti-HIV-1 activity, while those in IFD and HGD resulted in no or much less activity. The modified peptides with no activity clearly showed much less alpha-helicity than the native peptides, while those with higher activity showed an almost similar or slightly increased alpha-helicity. Therefore, the present results suggest that the introduction of a dC-C bridge in the N-terminal hydrophobic domain of a C-peptide may be useful for enhancing the anti-HIV-1 activity.
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Full text: Available Index: WPRIM (Western Pacific) Main subject: Peptides / Structure-Activity Relationship / Molecular Sequence Data / Models, Molecular / HIV Envelope Protein gp41 / Cell Line / Amino Acid Sequence / HIV-1 / Circular Dichroism / Protein Structure, Tertiary Limits: Humans Language: English Journal: Experimental & Molecular Medicine Year: 2006 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Main subject: Peptides / Structure-Activity Relationship / Molecular Sequence Data / Models, Molecular / HIV Envelope Protein gp41 / Cell Line / Amino Acid Sequence / HIV-1 / Circular Dichroism / Protein Structure, Tertiary Limits: Humans Language: English Journal: Experimental & Molecular Medicine Year: 2006 Type: Article