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Structural Biology of Peptides

Understanding peptide structure at atomic resolution is fundamental to rational drug design. This section covers the principal experimental and computational methods used to determine peptide three-dimensional conformations.

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Peptide Secondary Structure Determination

Alpha-helices, beta-sheets, turns, and random coils β€” principles, prediction methods, and experimental validation of peptide secondary structure.

β†’ Ramachandran plot analysis
β†’ Helical wheel projections
β†’ Secondary structure prediction algorithms
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X-ray Crystallography of Peptides

Crystallization strategies, data collection, phase determination, and refinement for peptide crystal structures at atomic resolution.

β†’ Peptide crystallization techniques
β†’ Synchrotron data collection
β†’ Structure refinement and validation
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NMR Spectroscopy for Peptide Structure

Solution-state NMR methods for peptide structure determination, including 2D experiments, chemical shift assignment, and distance restraint calculation.

β†’ COSY, TOCSY, NOESY experiments
β†’ Chemical shift indexing
β†’ Structure calculation protocols
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Circular Dichroism in Peptide Analysis

Principles and applications of far-UV and near-UV CD spectroscopy for peptide secondary structure estimation, folding studies, and thermal stability analysis.

β†’ Far-UV CD spectral interpretation
β†’ Thermal denaturation monitoring
β†’ Buffer and concentration effects
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Peptide–Protein Interaction Structures

Methods for determining peptide-receptor and peptide-protein complex structures, including co-crystallization, docking, and integrative approaches.

β†’ Co-crystallization strategies
β†’ Cryo-EM of peptide complexes
β†’ Integrative structural biology