Mechanisms of sublethal copper toxicity damage to the photosynthetic apparatus of Rhodospirillum rubrum
Jazyk angličtina Země Nizozemsko Médium print-electronic
Typ dokumentu časopisecké články, práce podpořená grantem
PubMed
31226316
DOI
10.1016/j.bbabio.2019.06.004
PII: S0005-2728(19)30056-8
Knihovny.cz E-zdroje
- Klíčová slova
- Bacteriochlorophyll, Copper toxicity, Light harvesting complex, Photosynthesis, Purple bacteria, Reaction centre,
- MeSH
- bakteriochlorofyly chemie MeSH
- fotosyntetické reakční centrum - proteinové komplexy antagonisté a inhibitory MeSH
- hořčík MeSH
- měď toxicita MeSH
- Rhodospirillum rubrum účinky léků MeSH
- světlosběrné proteinové komplexy MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Názvy látek
- bakteriochlorofyly MeSH
- fotosyntetické reakční centrum - proteinové komplexy MeSH
- hořčík MeSH
- měď MeSH
- světlosběrné proteinové komplexy MeSH
Magnesium (Mg2+) is the ubiquitous metal ion present in chlorophyll and bacteriochlorophyll (BChl), involved in photosystems in photosynthetic organisms. In the present study we investigated targets of toxic copper binding to the photosynthetic apparatus of the anoxygenic purple bacterium Rhodospirillum rubrum. This was done by a combination of in vivo measurements of flash photolysis and fast fluorescence kinetics combined with the analysis of metal binding to pigments and pigment-protein complexes isolated from Cu-stressed cells by HPLC-ICPMS (ICP-sfMS). This work concludes that R. rubrum is highly sensitive to Cu2+, with a strong inhibition of the photosynthetic reaction centres (RCs) already at 2 μM Cu2+. The inhibition of growth and of RC activity was related to the formation of Cu-containing BChl degradation products that occurred much more in the RC than in LH1. These results suggest that the shift of metal centres in BChl from Mg2+ to Cu2+ can occur in vivo in the RCs of R. rubrum under environmentally realistic Cu2+ concentrations, leading to a strong inhibition of the function of these RCs.
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