The structure and function of the LH2 (B800-850) complex from the purple photosynthetic bacterium Rhodopseudomonas acidophila strain 10050.
نویسندگان
چکیده
منابع مشابه
The crystallographic structure of the B800-820 LH3 light-harvesting complex from the purple bacteria Rhodopseudomonas acidophila strain 7050.
The B800-820, or LH3, complex is a spectroscopic variant of the B800-850 LH2 peripheral light-harvesting complex. LH3 is synthesized by some species and strains of purple bacteria when growing under what are generally classed as "stressed" conditions, such as low intensity illumination and/or low temperature (<30 degrees C). The apoproteins in these complexes modify the absorption properties of...
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Uphill energy transfer in the LH2-containing purple bacteria Rhodopseudomonas acidophila, Rhodopseudomonas palustris, Rhodobacter sphaeroides, Chromatium vinosum and Chromatium purpuratum was studied by stationary fluorescence spectroscopy at room temperature upon selective excitation of the B800 pigments of LH2 and the B880 pigments of LH1 at 803 nm and 900 nm, respectively. The resulting fluo...
متن کاملFluorescence spectral fluctuations of single LH2 complexes from Rhodopseudomonas acidophila strain 10050.
We have investigated the energy landscape of the bacterial photosynthetic peripheral light-harvesting complex LH2 of purple bacterium Rhodopseudomonas acidophila by monitoring sequences of fluorescence spectra of single LH2 assemblies, at room temperature, with different excitation intensities as well as at elevated temperatures, utilizing a confocal microscope. The fluorescence peak wavelength...
متن کاملA quantum mechanical analysis of the light-harvesting complex 2 (LH2) from purple photosynthetic bacteria: Insights into the electrostatic effects of transmembrane helices
We perform a quantum mechanical study of the peptides that are part of the LH2 complex from Rhodopseudomonas acidophila, a non-sulfur purple bacteria that has the ability of producing chemical energy from photosynthesis. The electronic structure calculations indicate that the transmembrane helices of these peptides are characterized by dipole moments with a magnitude of about 150D. When the ful...
متن کاملThe complete amino acid sequences of the B800-850 antenna polypeptides from Rhodopseudomonas acidophila strain 7750.
Spectrally pure B800-850 light harvesting complexes of Rhodopseudomonas acidophila 7750 were prepared by chromatography of LDAO-solubilised photosynthetic membranes on Whatmann DE-52 ion exchange resin. Two low molecular mass polypeptides (alpha, beta) have been isolated by organic solvent extraction of the lyophilised B800-850 light harvesting complexes. Their primary structures were determine...
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ورودعنوان ژورنال:
- Progress in biophysics and molecular biology
دوره 68 1 شماره
صفحات -
تاریخ انتشار 1997