Describing some properties of adenylat kinase using fractal concepts

This paper reveals fractal aspects of the adenylat kinase structure and dynamics. The spatial series of the coordinates of the carbon-alpha atoms of the free enzyme and of its complex with the inhibitor AP(5)A, respective those of the changes in these coordinates when the enzyme forms the complex with the inhibitor present I/f(beta) power spectra with 1 < beta < 2 and it is a signature of fractality. The values of the scaling exponents obtained using the detrended fluctuations analysis method for the same series of data are comprises in the interval 1 < alpha < 1.5 and they are in good agreement with those of the spectral coefficient beta. The correlation dimensions for the point sets of data are non-integer values and all these results reflect fractality in the analyzed series of data. (C) 2003 Elsevier Ltd. All rights reserved.