The intracellular distribution of inorganic carbon fixing enzymes does not support the presence of a C4 pathway in the diatom Phaeodactylum tricornutum

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Ewe_2-119vvpk2ob1802.pdf
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2018
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Tachibana, Masaaki
Kikutani, Sae
Konert, Grzegorz
Kaplan, Aaron
Matsuda, Yusuke
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Diatoms are unicellular algae and important primary producers. The process of carbon fixation in diatoms is very efficient even though the availability of dissolved CO2 in sea water is very low. The operation of a carbon concentrating mechanism (CCM) also makes the more abundant bicarbonate accessible for photosynthetic carbon fixation. Diatoms possess carbonic anhydrases as well as metabolic enzymes potentially involved in C4 pathways; however, the question as to whether a C4 pathway plays a general role in diatoms is not yet solved. While genome analyses indicate that the diatom Phaeodactylum tricornutum possesses all the enzymes required to operate a C4 pathway, silencing of the pyruvate orthophosphate dikinase (PPDK) in a genetically transformed cell line does not lead to reduced photosynthetic carbon fixation. In this study, we have determined the intracellular location of all enzymes potentially involved in C4-like carbon fixing pathways in P. tricornutum by expression of the respective proteins fused to green fluorescent protein (GFP), followed by fluorescence microscopy. Furthermore, we compared the results to known pathways and locations of enzymes in higher plants performing C3 or C4 photosynthesis. This approach revealed that the intracellular distribution of the investigated enzymes is quite different from the one observed in higher plants. In particular, the apparent lack of a plastidic decarboxylase in P. tricornutum indicates that this diatom does not perform a C4-like CCM.

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570 Biowissenschaften, Biologie
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C4 photosynthesis, Chloroplast, Green fluorescent protein (GFP), Carboxylation, Decarboxylation
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ISO 690EWE, Daniela, Masaaki TACHIBANA, Sae KIKUTANI, Ansgar GRUBER, Carolina RÍO BÁRTULOS, Grzegorz KONERT, Aaron KAPLAN, Yusuke MATSUDA, Peter G. KROTH, 2018. The intracellular distribution of inorganic carbon fixing enzymes does not support the presence of a C4 pathway in the diatom Phaeodactylum tricornutum. In: Photosynthesis research. 2018, 137(2), pp. 263-280. ISSN 0166-8595. eISSN 1573-5079. Available under: doi: 10.1007/s11120-018-0500-5
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@article{Ewe2018-08intra-42807,
  year={2018},
  doi={10.1007/s11120-018-0500-5},
  title={The intracellular distribution of inorganic carbon fixing enzymes does not support the presence of a C4 pathway in the diatom Phaeodactylum tricornutum},
  number={2},
  volume={137},
  issn={0166-8595},
  journal={Photosynthesis research},
  pages={263--280},
  author={Ewe, Daniela and Tachibana, Masaaki and Kikutani, Sae and Gruber, Ansgar and Río Bártulos, Carolina and Konert, Grzegorz and Kaplan, Aaron and Matsuda, Yusuke and Kroth, Peter G.}
}
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