Conclusion
Initial structure formation corresponded cotranslational protein folding. Torsion angels of the residue on backbone rotates one by one following torsional inertia. Optimization based on torsional inertia has reduced the number of candidate structures for the native structure. Stable conformation with low potential energy was obtained after input angiotensin sequence into ProtTorter which has the functions of torsion angle rotations and potential energy calculation. Coordinates of local minima to the stable structure were observed in very short time. The clearest folding pathway was represented in the most stable structure coordinate.
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