Ramakrishnan, C.
(1964)
*Stereochemical criteria for polypeptide and protein chain conformations. Part I. Evaluation of helical parameters*
Proceedings of the Indian Academy of Sciences, Section A, 59
(5).
pp. 327-343.
ISSN 0370-0089

Full text not available from this repository.

Official URL: http://www.ias.ac.in/j_archive/proca/59/vol59conte...

Related URL: http://dx.doi.org/10.1007/BF03046447

## Abstract

A large number of configurations are possible for a polypeptide structure depending upon the relative orientations of the two peptide groups linked at an α-carbon atom. If the linkages at the α-carbon atoms are identical, then the structure assumes a regular helical form. Such a regular helical structure can be specified by two parameters φ, φ' which are the angles of rotation of the two groups about the N−αC and αC−C' bonds meeting at an α-carbon atom. In this paper, a method of evaluating the helical parameters of a structure, namely, the number of residues per turn n, the unit translation along the axis of the helix h and the direction cosines of the helical axis with respect to a suitably chosen co-ordinate system, is described making use of rotation matrices. The evaluation has been done for three different values of the angle NαCC at the α-carbon atom, namely, 105°, 110° and 115°. The results are shown graphically in the form of curves for constant n and constant h in the φ-φ' plane.

Item Type: | Article |
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ID Code: | 41023 |

Deposited On: | 26 May 2011 06:36 |

Last Modified: | 26 May 2011 06:36 |

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