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Long- and short-range interactions in native protein structures are consistent/minimally frustrated in sequence
Sanzo Miyazawa1, Robert L Jernigan
1Faculty of Technology, Gunma University, Kiryu, Gunma, Japan. miyazawa@smlab.sci.gunma-u.ac.jp
Proteins
|December 10, 2002
Summary
Protein native structures exhibit consistent long- and short-range interactions, optimizing sequence space. This finding aids in designing stable and foldable protein structures and sequences.
Area of Science:
- Biophysics
- Computational Biology
- Structural Biology
Background:
- Protein structure is determined by complex interactions.
- Understanding these interactions is key to protein folding and function.
Purpose of the Study:
- To investigate the consistency between long-range (inter-residue contact) and short-range (secondary structure) interactions in protein native structures.
- To determine if these interactions are compatible at coarse-grained energy scales.
Main Methods:
- Generation of statistical ensembles of sequences for 797 protein native structures using the Metropolis method.
- Evaluation of potentials of mean force from residue distributions.
- Analysis of energy scales, sequence space restrictions, and correlations between interaction classes.
Main Results:
- Long- and short-range interactions are consistent in most protein native structures at coarse-grained energy scales.
- Both interaction types restrict available sequence spaces, enhancing stability.
- Minimal correlations between interaction classes suggest independence when both are considered.
Conclusions:
- Protein native sequences can be approximated as samples from statistical ensembles defined by these energy scales.
- All proteins appear to share the same effective conformational temperature.
- Designing for consistency and minimal frustration among interactions is crucial for protein stability and foldability.