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Electronic structures of Ascaris trypsin inhibitor in solution
1Pohl Institute of Solid State Physics, Tongji University, Shanghai 200092, China. zhenghp@mail.tongji.edu.cn
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 20, 2003
Summary
Ascaris trypsin inhibitor's stable form, 1atb, was identified using advanced computational methods. This finding aids in understanding viral variability and developing new antiviral strategies.
Area of Science:
- Computational chemistry
- Biochemistry
- Structural biology
Background:
- Ascaris trypsin inhibitor is a protein with potential applications in antiviral therapies.
- Understanding the inhibitor's electronic structure and stability is crucial for its development.
- Two distinct solution structures, 1ata and 1atb, have been identified.
Purpose of the Study:
- To determine the electronic structures of Ascaris trypsin inhibitor in solution.
- To identify the stable and biologically active form of the inhibitor.
- To explore potential applications in antiviral drug development.
Main Methods:
- First-principles, all-electron, ab initio calculation.
- Self-consistent cluster-embedding (SCCE) method.
- Analysis of electronic structures and active sites of two inhibitor conformations (1ata and 1atb).
Main Results:
- Structure 1atb exhibits a lower ground-state energy (by 6.12 eV) compared to structure 1ata.
- Only structure 1atb possesses an N-terminal at residue ARG+31, indicating it is the active form.
- The study suggests that modifications to certain inhibitor parts may preserve biological activity.
Conclusions:
- Structure 1atb represents the stable and active form of Ascaris trypsin inhibitor, consistent with experimental data.
- The findings provide insights into inhibitor modifications for maintaining biological activity.
- This research offers a theoretical basis for developing strategies against highly variable viruses like AIDS, SARS, and influenza.