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Conformational study of vasoactive intestinal peptide by computational methods
M Filizola1, M Cartenì-Farina, J J Perez
1Centro di Ricerca Interdipartimentale di Scienze Computazionali e Biotecnologiche (CRISCEB), Seconda Universitá degli Studi di Napoli, Italy.
Summary
Computational methods reveal that vasoactive intestinal peptide (VIP) predominantly adopts bent conformations. These findings inform the design of new peptide analogs targeting the CD4 receptor.
Area of Science:
- Biochemistry and Molecular Biology
- Computational Chemistry
- Structural Biology
Background:
- Vasoactive intestinal peptide (VIP) is a crucial neuropeptide with diverse physiological roles.
- Understanding VIP's conformational dynamics is essential for elucidating its function and interactions.
- Previous studies suggested specific turn conformations in VIP based on NMR data.
Purpose of the Study:
- To computationally characterize the conformational landscape of vasoactive intestinal peptide (VIP).
- To investigate the compatibility of VIP's N-terminal fragment conformations with helical structures.
- To compare VIP conformations with Peptide T for CD4 receptor targeting insights.
Main Methods:
- Utilized molecular mechanics and simulated annealing for conformational sampling of the VIP(1-11) fragment.
- Integrated low-energy fragment conformations with a two-alpha-helix model of the full VIP structure.
- Employed energy minimization to assess the compatibility of fragment conformations with the overall peptide structure.
Main Results:
- Identified predominantly bent conformations for the VIP(1-11) fragment, including the global minimum.
- Confirmed the presence of alpha-turns and beta-turns, consistent with prior NMR findings.
- Found that most low-energy VIP(1-11) conformations are compatible with the proposed full-length VIP structure.
Conclusions:
- VIP primarily exists in bent conformations, with specific turns also being significant.
- The characterized conformational features of VIP(1-11) are likely present in the full VIP molecule.
- Conformational similarities between VIP and Peptide T may guide the design of CD4 receptor-targeting analogs.