ArticlePhotosynthesis research2012
The reaction center is the sensitive target of the mercury(II) ion in intact cells of photosynthetic bacteria.
Article in Photosynthesis research, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers.
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Who cites it
12 citing papers in PubMed, 31 citations in OpenAlex.
- Microbial bioindicators for multidimensional assessment of environmental alterations and ecosystem functioning.World journal of microbiology & biotechnology · 2026Review
- Simultaneous removal of heavy metals and inorganic nitrogen by using the biofilm of Marichromatium gracile YL28.World journal of microbiology & biotechnology · 2024Article
- Light-induced reversible reorganizations in closed Type II reaction centre complexes: physiological roles and physical mechanisms.Open biology · 2022Review
- The periodic table of photosynthetic purple non-sulfur bacteria: intact cell-metal ions interactions.Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology · 2022Review
- Bioremediation byMicroorganisms · 2020Article
- Characterization of mercury(II)-induced inhibition of photochemistry in the reaction center of photosynthetic bacteria.Photosynthesis research · 2018Article
- Stoichiometry and kinetics of mercury uptake by photosynthetic bacteria.Photosynthesis research · 2017Article
- Electron-Transfer Secondary Reaction Matrices for MALDI MS Analysis of Bacteriochlorophyll a in Rhodobacter sphaeroides and Its Zinc and Copper Analogue Pigments.Journal of the American Society for Mass Spectrometry · 2017Article
- Diversity of purple nonsulfur bacteria in shrimp ponds with varying mercury levels.Saudi journal of biological sciences · 2016Article
- Induction and anisotropy of fluorescence of reaction center from photosynthetic bacterium Rhodobacter sphaeroides.Photosynthesis research · 2016Article
- Fluorescence relaxation in intact cells of photosynthetic bacteria: donor and acceptor side limitations of reopening of the reaction center.Photosynthesis research · 2015Article
- Stigmatellin probes the electrostatic potential in the QB site of the photosynthetic reaction center.Biophysical journal · 2015Article
Corrections and comments
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Authors and funding
5 authors at 2 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The sensitivity of intact cells of purple photosynthetic bacterium Rhodobacter sphaeroides wild type to low level (<100 μM) of mercury (Hg²⁺) contamination was evaluated by absorption and fluorescence spectroscopies of the bacteriochlorophyll-protein complexes. All assays related to the function of the reaction center (RC) protein (induction of the bacteriochlorophyll fluorescence, delayed fluorescence and light-induced oxidation and reduction of the bacteriochlorophyll dimer and energization of the photosynthetic membrane) showed prompt and later effects of the mercury ions. The damage expressed by decrease of the magnitude and changes of rates of the electron transfer kinetics followed complex (spatial and temporal) pattern according to the different Hg²⁺ sensitivities of the electron transport (donor/acceptor) sites including the reduced bound and free cytochrome c₂ and the primary reduced quinone. In contrast to the RC, the light harvesting system and the bc₁ complex demonstrated much higher resistance against the mercury pollution. The 850 and 875 nm components of the peripheral and core complexes were particularly insensitive to the mercury(II) ions. The concentration of the photoactive RCs and the connectivity of the photosynthetic units decreased upon mercury treatment. The degree of inhibition of the photosynthetic apparatus was always higher when the cells were kept in the light than in the dark indicating the importance of metabolism in active transport of the mercury ions from outside to the intracytoplasmic membrane. Any of the tests applied in this study can be used for detection of changes in photosynthetic bacteria at the early stages of the action of toxicants.
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