A unique low light adaptation mechanism in Rhodobacter azotoformans

  title={A unique low light adaptation mechanism in Rhodobacter azotoformans},
  author={Kai Li and Chun-gui Zhao and Huiying Yue and Suping Yang},
  journal={Journal of Basic Microbiology},
In this paper, we reported for the first time that Rhodobacter azotoformans was capable of synthesizing a spectral variant of peripheral light‐harvesting complex (LH3), besides a high light form (LH2), in response to low light intensity. Carotenoid components in these complexes were analyzed by absorption spectra, high‐pressure liquid chromatography and mass spectroscopy analysis. Only spheroidene carotenoid was detected in LH2, while LH3 possessed three kinds of carotenoids, spheroidene… Expand
Acclimation strategy of Rhodopseudomonas palustris to high light irradiance.
The results obtained clearly showed that the photosynthetic unit was significantly affected by the light irradiance at which Rp. Expand
The Growth‐promoting Mechanism of Unusual Spectroscopic Form of LH2 (LH4) from Rhodopseudomonas palustris CGA009 in Low Light
LH4 could provide more and high energetic state photons for promoting bacterial phototrophic growth in response to low‐light environment and the fluorescence quantum efficiency was used to compare the EET between LH2 and LH4. Expand
Genome Sequence of Rhodoferax antarcticus ANT.BRT; A Psychrophilic Purple Nonsulfur Bacterium from an Antarctic Microbial Mat
This report represents the first genomic analysis of a psychrophilic anoxygenic phototroph and provides a glimpse of the genetic basis for maintaining a phototrophic lifestyle in a permanently cold, yet highly variable, environment. Expand
Powered by light: Phototrophy and photosynthesis in prokaryotes and its evolution.
This review is devoted to the occurrence and main features of phototrophy and photosynthesis in prokaryotes and Hypotheses concerning the origin and spread of photosynthetic traits in bacteria are discussed. Expand


Spectroscopic studies of two spectral variants of light-harvesting complex 2 (LH2) from the photosynthetic purple sulfur bacterium Allochromatium vinosum.
Two spectral forms of the peripheral light-harvesting complex (LH2) from the purple sulfur photosynthetic bacterium Allochromatium vinosum were purified and their photophysical properties characterized, demonstrating that the change of the distribution of the carotenoids when cells were grown at low light adapts the absorptive properties of the complex to the light conditions and maintains maximum photon-capture performance. Expand
Studies on the different types of LH2 complexes from the purple non-sulphur photosynthetic bacterium Rhodopseudomonas palustris strain 2.1.6
For the first time, direct evidence that individual LL LH2 complexes have a heterogeneous αβ-apoprotein composition has been found. Expand
In vitro reconstitution of the core and peripheral light-harvesting complexes of Rhodospirillum molischianum from separately isolated components.
This work isolated the alpha and beta polypeptides of the LH2 complexes from an LH2-only strain of Rhodobacter (Rb.) sphaeroides and examined their behavior in reconstitution assays with bacteriochlorophyll (Bchl) to better understand the basis of the biochemical and spectral differences between LH1 and LH2. Expand
Antenna mixing in photosynthetic membranes from Phaeospirillum molischianum
Chemical cross-linking and mass-spectrometry shows that individual LH2 rings and subunits can contain a mixture of polypeptides derived from the different operons, and shows that the light-harvesting complexes resulting from this mixing could be important in maintaining photosynthetic efficiency during adaptation. Expand
A spectral characterisation of the light-harvesting pigment-protein complexes from Rhodopseudomonas acidophila
Four different antenna-complexes were prepared from two wild-type strains of Rhodopseudomonas acidophila and their absorption, fluorescence emission and excitation spectra were recorded as a function of temperature and the relative efficiency of the carotenoid-to-bacteriochlorophyll a energy transfer varied markedly, depending upon the type of complex. Expand
[Isolation and characterization of pigment-protein complexes from Rhodobacter azotoformans].
Rhodobacter azotoformans R7 with hydrogen-producing capacity could photosynthesize two types of LH2 under anaerobically in the light, one of them presented novel spectral property. Expand
Architecture of the native photosynthetic apparatus of Phaeospirillum molischianum.
Atomic force microscopy is used to study the architecture of the photosynthetic apparatus and analyze the structure of single molecules in chromatophores of Phaeospirillum molischianum, finding the symmetry mismatch caused by octameric LH2 packing in a hexagonal lattice suggests lipophobic effects rather than specific inter-molecular interactions drive protein organization. Expand
Preferential Incorporation of Coloured-carotenoids Occurs in the LH2 Complexes From Non-sulphur Purple Bacteria Under Carotenoid-limiting Conditions
The results show that although the presence of Car molecules is important for the stability of the LH2 complexes that the overall native structure can be maintained by the absence of many different Cars. Expand
A bacteriophytochrome regulates the synthesis of LH4 complexesin Rhodopseudomonas palustris
It is shown that LH4 expression can be induced with red light at the Pr absorption maximum (708 nm) of Bph4, which can sense the reduction in light intensity indirectly through an increase in ratio of transmitted red/far-red light. Expand
The effect of growth conditions on the light-harvesting apparatus in Rhodopseudomonas acidophila
The detailed effect on the light-harvesting apparatus of three different wild-type strains of Rhodopseudomonas acidophila in response to changes in both light-intensity and temperature have beenExpand