DERIVATION OF ATOMIC CO-ORDINATES IN HELICAL STRUCTURES
MASSACHUSETTS INST OF TECH CAMBRIDGE LAB FOR INSULATION RESEARCH
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A general method is developed for obtaining the coordinates of atoms in helical structures. The helix is treated as the repetition of a structural unit by an n-fold screw axis, where n is continuously variable. The coordinates are needed in complex structures such as proteins for the calculation of bond angles. The specific form in which the derivation is presented was deveoper for the analysis of polypeptide chain helices. Graphs are given which facilitate the use of the derived expressions.
- Atomic and Molecular Physics and Spectroscopy