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Published on: August 1, 2018
Isostructural unbranched alkyl-chains as tools for stabilizing β-turn structure.
Rajwant Kaur1, Raghuvansh Kishore
1Protein Science & Engineering Division, CSIR-Institute of Microbial Technology, Sector 39-A, Chandigarh, 160036, India.
Apolar alkyl-chains flanking a Pro-Gly sequence enhance the stability and population of beta-turn structures. These findings highlight the role of hydrophobic interactions in stabilizing protein secondary structures.
Area of Science:
- * Peptide chemistry and structural biology.
- * Biophysical characterization of protein structure.
Background:
- * Beta-turns are crucial secondary structures in proteins.
- * Understanding factors stabilizing beta-turns is essential for protein folding and function.
- * Lipidation is a key post-translational modification influencing protein structure and function.
Purpose of the Study:
- * To investigate the role of unbranched alkyl-chains in stabilizing beta-turn structures.
- * To compare the conformational properties of a designed peptide with alkyl-chains to a parent peptide.
- * To explore the contribution of hydrophobic interactions to the stability of folded reverse turn structures.
Main Methods:
- * Nuclear Magnetic Resonance (NMR) spectroscopy ((13)C and (1)H) to determine peptide-bond configuration and thermodynamic parameters.
- * Fourier Transform Infrared (FTIR) spectroscopy to analyze hydrogen-bonded structures.
- * Circular Dichroism (CD) spectroscopy to assess secondary structure populations.
Main Results:
- * Apolar alkyl-chains flanking a Pro-Gly sequence significantly increase the stability of the beta-turn structure.
- * Hydrophobic interactions contribute to the stability of folded reverse turn structures.
- * Alkyl-chains promote enhanced populations of the type II beta-turn structure.
Conclusions:
- * Unbranched alkyl-chains can stabilize specific secondary structures in peptides.
- * These findings have implications for designing peptides that mimic and stabilize protein structural motifs.
- * Alkyl-chains (Plm and Pda) can serve as effective N- and C-terminal protecting groups, mimicking protein lipidation.
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