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Mode Change in the Self‐Motion of a Benzoquinone Disk Coupled with a NADPH System
Author(s) -
Nakata Satoshi,
Matsuda Yui,
Ikura Yumihiko S.,
Takeda Akira,
Izumi Shunsuke
Publication year - 2012
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201100773
Subject(s) - chemistry , motion (physics) , benzoquinone , mode (computer interface) , reaction mechanism , surface tension , amplitude , enzyme catalysis , enzyme , photochemistry , catalysis , physics , optics , thermodynamics , classical mechanics , organic chemistry , computer science , operating system
The self‐motion of a benzoquinone (BQ) disk on NADPH was investigated as the coupling of an autonomous motor and an enzyme reaction. In the absence of the enzyme reaction, features of motion changed depending on the concentration of NADPH, that is, continuous motion→ intermittent oscillatory motion→ no motion. When the reverse reaction from NADP + to NADPH was introduced into the system with the addition of an enzyme reaction, continuous motion changed to intermittent oscillatory motion with small amplitude. The mechanism of this mode change is discussed in relation to the surface tension as a driving force and the time course of UV spectra as a window to the progress of the reaction. Characteristic features of the mode change were qualitatively reproduced by a numerical calculation.