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Fractals for hybrid orbitals in protein models

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3 Author(s)
F. Torrens ; Dept. de Quimica Fisica, Valencia Univ., Spain ; J. Sanchez-Marin ; I. Nebot-Gil

The concept of fractal has been applied to a number of properties of proteins. The structure and shape of the polypeptide chain of proteins are determined by the hybridized states of atomic orbitals in the molecular chain. The fractal dimension in the range of short distances (1-10 Å) of the tertiary structures of some proteins covering various structural classes of protein molecules have been analyzed and compared with a Gaussian chain. The interpretation is given in terms of steric repulsion. The calculated s ratio in the spn hybrid orbitals is computed from the fractal dimension. A mean value of about 0.29 predicts sp2.46 hybrid orbitals, half-way between planar sp2 orbitals and tetrahedral sp3 hydrids. The β proteins are distinguished quantitatively from other classes. They show a higher s ratio (about 0.32) which predicts about sp 2.1 hybrid orbitals, very similar to planar sp2 orbitals

Published in:

Information Technology Applications in Biomedicine, 1998. ITAB 98. Proceedings. 1998 IEEE International Conference on

Date of Conference:

16-17 May 1998