Modeling the electron transport chain of purple non-sulfur bacteria.
Purple non-sulfur bacteria (Rhodospirillaceae) have been extensively employed for studying principles of photosynthetic and respiratory electron transport phosphorylation and for investigating the regulation of gene expression in response to redox signals. Here, we use mathematical modeling to evaluate the steady-state behavior of the electron transport chain (ETC) in these bacteria under different environmental conditions. Elementary-modes analysis of a stoichiometric ETC model reveals nine operational modes. Most of them represent well-known functional states, however, two modes constitute reverse electron flow under respiratory conditions, which has been barely considered so far. We further present and analyze a kinetic model of the ETC in which rate laws of electron transfer steps are based on redox potential differences. Our model reproduces well-known phenomena of respiratory and photosynthetic operation of the ETC and also provides non-intuitive predictions. As one key result, model simulations demonstrate a stronger reduction of ubiquinone when switching from high-light to low-light conditions. This result is parameter insensitive and supports the hypothesis that the redox state of ubiquinone is a suitable signal for controlling photosynthetic gene expression.
Klamt
Steffen
S
Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany. klamt@mpi-magdeburg.mpg.de
Grammel
Hartmut
H
Straube
Ronny
R
Ghosh
Robin
R
Gilles
Ernst Dieter
ED
D000244:Adenosine Diphosphate / Q000378:metabolism; D000255:Adenosine Triphosphate / Q000378:metabolism; D000332:Aerobiosis / Q000528:radiation effects; D000693:Anaerobiosis / Q000528:radiation effects; D003198:Computer Simulation; D004579:Electron Transport / Q000528:radiation effects; D007700:Kinetics; D008027:Light; D008954:Models, Biological; D009243:NAD / Q000378:metabolism; D012244:Rhodospirillaceae / Q000254:growth & development / Q000378:metabolism* / Q000528:radiation effects
D009243:NAD; D000244:Adenosine Diphosphate; D000255:Adenosine Triphosphate