Mechanisms of hydration effects on the structural-dynamic and functional characteristics of photosynthetic membranes in various purple bacteria

摘要: NMR spectra and T1, T2 relaxation times for 1H, 13C 31P nuclei in membranes of R. rubrum Rb. sphaeroides recorded at different relative humidity, as well hydration curves electron transfer efficiency these E. shaposhnikovii, reveal complicated relations between structural-dynamic functional characteristics. A number sites the chain are shown to be under control mechanisms. Different parameters characterizing low humidity during have been established. These findings analysis data from model systems four stages hydration. Each them is associated with specific changes structure, dynamics, function photosynthetic their components. In first stage some polar groups leads local dynamics protein component this influences recombination photoactive pigment P intermediate acceptor QA. The second induced by incorporation water molecules into hydrogen bonds head lipids within macromolecules. This results membranes, quinones photooxidation cytochrome c. third all hydrated owing appearance free a high dielectric constant. makes possible lateral mobility membrane components distances interacting macromolecular Therefore, regulation processes can mediated participation mobile carriers. Finally, fourth stage, complete humidification provides conditions photosynthesis cell level. mechanisms influencing various parts discussed.