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The mechanism of anthracene interaction with photosynthetic apparatus: A study using intact cells, thylakoid membranes and PS II complexes isolated from Chlamydomonas reinhardtii
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Umeå Plant Science Centre (UPSC). Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysiologisk botanik.
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Umeå Plant Science Centre (UPSC). Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysiologisk botanik.ORCID-id: 0000-0003-2133-6526
2011 (Engelska)Ingår i: Aquatic Toxicology, ISSN 0166-445X, E-ISSN 1879-1514, Vol. 104, nr 3-4, s. 205-210Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Intact cells of Chlamydomonas reinhardtii as well as isolated thylakoid membranes and photosystem II complexes were used to examine a possible mechanism of anthracene (ANT) interaction with the photosynthetic apparatus. Since ANT concentrations above 1 mM were required to significantly inhibit the rate of oxygen evolution in PS II membrane fragments it may indicate that the toxicant did not directly interact with this photosystem. On the other hand, stimulation of oxygen uptake by ANT-treated thylakoids suggested that ANT could either act as an artificial electron acceptor in the photosynthetic electron transport chain or function as an uncoupler. Electron transfer from excited chlorophyll to ANT is impossible due to the very low reduction potential of ANT and therefore we propose that toxic concentrations of ANT increase the thylakoid membrane permeability and thereby function as an uncoupler, enhancing electron transport in vitro. Hence, its unspecific interference with photosynthetic membranes in vitro suggests that the inhibitory effect observed on intact cell photosynthesis is caused by uncoupling of phosphorylation. 

Ort, förlag, år, upplaga, sidor
2011. Vol. 104, nr 3-4, s. 205-210
Nyckelord [en]
Chlamydomonas, Anthracene, Toxicity, Photosystems, Phosphorylation
Nationell ämneskategori
Botanik
Identifikatorer
URN: urn:nbn:se:umu:diva-104833DOI: 10.1016/j.aquatox.2011.04.017ISI: 000293042100006PubMedID: 21632024OAI: oai:DiVA.org:umu-104833DiVA, id: diva2:823053
Tillgänglig från: 2015-06-17 Skapad: 2015-06-15 Senast uppdaterad: 2018-06-07Bibliografiskt granskad

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Shutova, TatianaSamuelsson, Göran

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