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Failures of inverse folding and threading with gapped alignment
1College of Pharmacy, University of Michigan, Ann Arbor 48109, USA.
Proteins
|October 1, 1996
Summary
Protein folding predictions using thermodynamic models face challenges. Even simple models show that contact potentials may not accurately predict native structures or alignments, necessitating reevaluation for complex protein representations.
Area of Science:
- Computational biology
- Biophysics
- Protein structure prediction
Background:
- Thermodynamic approaches are crucial for predicting protein tertiary structure from amino acid sequences.
- Accurate potential functions are needed to identify the native conformation as the global minimum for diverse proteins.
Purpose of the Study:
- To investigate the efficacy of potential functions in protein folding prediction using a simplified model system.
- To evaluate the ability of contact potentials to correctly identify folding sequences and their native conformations.
Main Methods:
- Studied two-dimensional square lattice chain configurations with two residue types.
- Analyzed the behavior of potential functions for sequence and conformation relationships.
Main Results:
- Demonstrated that contact potentials do not always correctly select sequences that fold to a specific structure.
- Showed that contact potentials may fail to favor native sequence alignment over other alignments on the native conformation.
Conclusions:
- Identified limitations of current potential functions even in simplified protein folding models.
- Highlighted the need to reexamine empirical potentials for inverse folding and gapped alignment in realistic protein models.