Random Coil
Random Coil — A disordered peptide conformation lacking regular secondary structure elements, detected by circular dichroism spectroscopy.
What Is a Random Coil?
A random coil is a peptide conformation lacking regular secondary structure (helix or sheet). Random coil peptides sample many conformations rapidly in solution. Most short linear peptides (< 15 residues) exist predominantly as random coil, which is one reason why cyclization and stapling are used to enforce defined conformations.
Detection
- CD: Strong negative band near 200 nm, weak signal above 210 nm
- NMR: Chemical shifts near random coil reference values. No medium/long-range NOEs
- Binding: Many peptides are random coil free in solution but fold upon binding targets (induced fit)
Frequently Asked Questions
What is Random Coil?
A disordered peptide conformation lacking regular secondary structure elements, detected by circular dichroism spectroscopy.
Why is Random Coil important in peptide research?
Random Coil is a fundamental concept in structure as it relates to peptide science. It directly influences experimental design, compound characterization, and the reliability of research outcomes across biochemistry and molecular biology disciplines.