Functional conformational motions in the turnover cycle of cholesterol oxidase.
Reexamining experimental data of single-molecule fluorescence correlation spectroscopy for cholesterol oxidase, we find that the existing Michaelis-Menten models with dynamical disorder cannot explain strong correlations between subsequent turnover cycles revealed in the diagonal feature in the joint statistical distribution of adjacent "on" times of this enzyme. We suggest that functional conformational motions representing ordered sequences of transitions between a set of conformational substates are involved, along with equilibrium conformational fluctuations in the turnover cycle of cholesterol oxidase. A two-channel model of single-enzyme dynamics, including a slow functional conformational motion in one of the channels, is proposed that allows us to reproduce such strong correlations.
Lerch
Hans-Philipp
HP
Abteilung Physikalische Chemie, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany. hlerch@stanford.edu
Rigler
Rudolf
R
Mikhailov
Alexander S
AS
D002789:Cholesterol Oxidase / Q000737:chemistry* / Q000378:metabolism*; D005182:Flavin-Adenine Dinucleotide / Q000737:chemistry / Q000378:metabolism; D007700:Kinetics; D008954:Models, Biological; D010084:Oxidation-Reduction; D011487:Protein Conformation; D013050:Spectrometry, Fluorescence; D013379:Substrate Specificity; D013816:Thermodynamics
D005182:Flavin-Adenine Dinucleotide; D002789:Cholesterol Oxidase