Segregation of Nitrogen Fixation and Oxygenic Photosynthesis in the Marine Cyanobacterium Trichodesmium

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2001
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Berman-Frank, Ilana
Lundgren, Pernilla
Chen, Yi-Bu
Kolber, Zbigniew
Bergman, Brigitta
Falkowski, Paul
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Science. 2001, 294(5546), pp. 1534-1537. ISSN 0036-8075. eISSN 1095-9203. Available under: doi: 10.1126/science.1064082
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In the modern ocean, a significant amount of nitrogen fixation is attributed to filamentous, nonheterocystous cyanobacteria of the genus Trichodesmium. In these organisms, nitrogen fixation is confined to the photoperiod and occurs simultaneously with oxygenic photosynthesis. Nitrogenase, the enzyme responsible for biological N2 fixation, is irreversibly inhibited by oxygen in vitro. How nitrogenase is protected from damage by photosynthetically produced O2 was once an enigma. Using fast repetition rate fluorometry and fluorescence kinetic microscopy, we show that there is both temporal and spatial segregation of N2 fixation and photosynthesis within the photoperiod. Linear photosynthetic electron transport protects nitrogenase by reducing photosynthetically evolved O2 in photosystem I (PSI). We postulate that in the early evolutionary phase of oxygenic photosynthesis, nitrogenase served as an electron acceptor for anaerobic heterotrophic metabolism and that PSI was favored by selection because it provided a micro-anaerobic environment for N2 Þxation in cyanobacteria

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ISO 690BERMAN-FRANK, Ilana, Pernilla LUNDGREN, Yi-Bu CHEN, Hendrik KÜPPER, Zbigniew KOLBER, Brigitta BERGMAN, Paul FALKOWSKI, 2001. Segregation of Nitrogen Fixation and Oxygenic Photosynthesis in the Marine Cyanobacterium Trichodesmium. In: Science. 2001, 294(5546), pp. 1534-1537. ISSN 0036-8075. eISSN 1095-9203. Available under: doi: 10.1126/science.1064082
BibTex
@article{BermanFrank2001Segre-8826,
  year={2001},
  doi={10.1126/science.1064082},
  title={Segregation of Nitrogen Fixation and Oxygenic Photosynthesis in the Marine Cyanobacterium Trichodesmium},
  number={5546},
  volume={294},
  issn={0036-8075},
  journal={Science},
  pages={1534--1537},
  author={Berman-Frank, Ilana and Lundgren, Pernilla and Chen, Yi-Bu and Küpper, Hendrik and Kolber, Zbigniew and Bergman, Brigitta and Falkowski, Paul}
}
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