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Protein WISDOM: A Workbench for In silico De novo Design of BioMolecules

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Optimization of a β-sheet-cap for long loop closure.

Jordan M Anderson¹, Alexander A Shcherbakov¹, Brandon L Kier¹

¹Department of Chemistry, University of Washington, Seattle, Washington.

|October 5, 2016

Summary

This summary is machine-generated.

Researchers designed novel peptide systems to study protein loop dynamics and stability. Introducing tryptophan pairs significantly enhanced beta-sheet stability, providing new tools for peptide chemists.

Keywords:

Aryl Cluster Trp/Trp beta-Capping beta-hairpin long loops peptide design

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Area of Science:

Biochemistry and Molecular Biology
Structural Biology
Biophysics

Background:

Protein loops are crucial for secondary structure but their dynamics and stability effects remain poorly understood.
Investigating loop closure dynamics and composition effects on fold stability is essential for understanding protein folding.
Existing methods offer limited insight into the stability and dynamics of these critical protein elements.

Purpose of the Study:

To design and characterize novel peptide systems for studying protein loop dynamics and fold stability.
To investigate the impact of loop length and composition on the stability of beta-sheet structures.
To utilize tryptophan (Trp) pairs as spectroscopic probes for assessing stability and dynamics.

Main Methods:

Design of peptide sequences with varying loop lengths and compositions connecting two beta-strands.
Incorporation of paired Trp residues to form stabilizing aromatic clusters.
Utilizing Nuclear Magnetic Resonance (NMR) and Circular Dichroism (CD) spectroscopy for stability and dynamics analysis.

Main Results:

A 16-residue loop peptide system demonstrated measurable folding stability (ΔG_U = 1.6 kJ/mol).
Addition of a Trp/Trp pair significantly enhanced beta-sheet stability in a 16-residue loop peptide (ΔG_U = 6.3 kJ/mol, T_m ≈ 55°C).
Trp/Trp pairs proved effective as spectroscopic probes for stability and dynamics via NMR.

Conclusions:

Engineered peptide constructs with Trp pairs offer a powerful platform for studying protein loop effects.
The findings provide new insights into the relationship between loop composition, stability, and folding dynamics.
These systems serve as valuable tools for peptide chemists and structural biologists.