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The origin of cytosolic ATP in photosynthetic cells
Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
2016 (English)In: Physiologia Plantarum: An International Journal for Plant Biology, ISSN 0031-9317, E-ISSN 1399-3054, Vol. 157, no 3, 367-379 p.Article, review/survey (Refereed) PublishedText
Abstract [en]

In photosynthetically active cells, both chloroplasts and mitochondria have the capacity to produce ATP via photophosphorylation and oxidative phosphorylation, respectively. Thus, theoretically, both organelles could provide ATP for the cytosol, but the extent, to which they actually do this, and how the process is regulated, both remain unclear. Most of the evidence discussed comes from experiments with rapid fractionation of isolated protoplasts subjected to different treatments in combination with application of specific inhibitors. The results obtained indicate that, under conditions where ATP demand for photosynthetic CO2 fixation is sufficiently high, the mitochondria supply the bulk of ATP for the cytosol. In contrast, under stress conditions where CO2 fixation is severely limited, ATP will build up in chloroplasts and it can then be exported to the cytosol, by metabolite shuttle mechanisms. Thus, depending on the conditions, either mitochondria or chloroplasts can supply the bulk of ATP for the cytosol. This supply of ATP is discussed in relation to the idea that mitochondrial functions may be tuned to provide an optimal environment for the chloroplast. By balancing cellular redox states, mitochondria can contribute to an optimal photosynthetic capacity.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2016. Vol. 157, no 3, 367-379 p.
National Category
Cell Biology Botany
Identifiers
URN: urn:nbn:se:umu:diva-124251DOI: 10.1111/ppl.12455ISI: 000379260400010PubMedID: 27087668OAI: oai:DiVA.org:umu-124251DiVA: diva2:950373
Available from: 2016-07-29 Created: 2016-07-29 Last updated: 2016-07-29Bibliographically approved

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Gardeström, Per
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