A novel photosynthetic strategy for adaptation to low-iron aquatic environments

Devendra Chauhan, I. Mihaela Folea, Craig C. Jolley, Roman Kour̂il, Carolyn E. Lubner, Su Lin, Dorota Kolber, Felisa Wolfe-Simon, John H. Golbeck, Egbert J. Boekema, Petra Fromme

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Iron (Fe) availability is a major limiting factor for primary production in aquatic environments. Cyanobacteria respond to Fe deficiency by derepressing the isiAB operon, which encodes the antenna protein IsiA and flavodoxin. At nanomolar Fe concentrations, a PSI-IsiA supercomplex forms, comprising a PSI trimer encircled by two complete IsiA rings. This PSI-IsiA supercomplex is the largest photosynthetic membrane protein complex yet isolated. This study presents a detailed characterization of this complex using transmission electron microscopy and ultrafast fluorescence spectroscopy. Excitation trapping and electron transfer are highly efficient, allowing cyanobacteria to avoid oxidative stress. This mechanism may be a major factor used by cyanobacteria to successfully adapt to modern low-Fe environments.

Original languageEnglish
Pages (from-to)686-692
Number of pages7
JournalBiochemistry
Volume50
Issue number5
DOIs
Publication statusPublished - Feb 8 2011

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Cyanobacteria
Iron
Photosynthetic membranes
Flavodoxin
Oxidative stress
Fluorescence Spectrometry
Fluorescence spectroscopy
Operon
Transmission Electron Microscopy
Membrane Proteins
Oxidative Stress
Availability
Electrons
Antennas
Transmission electron microscopy
Proteins

ASJC Scopus subject areas

  • Biochemistry

Cite this

Chauhan, D., Folea, I. M., Jolley, C. C., Kour̂il, R., Lubner, C. E., Lin, S., ... Fromme, P. (2011). A novel photosynthetic strategy for adaptation to low-iron aquatic environments. Biochemistry, 50(5), 686-692. https://doi.org/10.1021/bi1009425

A novel photosynthetic strategy for adaptation to low-iron aquatic environments. / Chauhan, Devendra; Folea, I. Mihaela; Jolley, Craig C.; Kour̂il, Roman; Lubner, Carolyn E.; Lin, Su; Kolber, Dorota; Wolfe-Simon, Felisa; Golbeck, John H.; Boekema, Egbert J.; Fromme, Petra.

In: Biochemistry, Vol. 50, No. 5, 08.02.2011, p. 686-692.

Research output: Contribution to journalArticle

Chauhan, D, Folea, IM, Jolley, CC, Kour̂il, R, Lubner, CE, Lin, S, Kolber, D, Wolfe-Simon, F, Golbeck, JH, Boekema, EJ & Fromme, P 2011, 'A novel photosynthetic strategy for adaptation to low-iron aquatic environments', Biochemistry, vol. 50, no. 5, pp. 686-692. https://doi.org/10.1021/bi1009425
Chauhan D, Folea IM, Jolley CC, Kour̂il R, Lubner CE, Lin S et al. A novel photosynthetic strategy for adaptation to low-iron aquatic environments. Biochemistry. 2011 Feb 8;50(5):686-692. https://doi.org/10.1021/bi1009425
Chauhan, Devendra ; Folea, I. Mihaela ; Jolley, Craig C. ; Kour̂il, Roman ; Lubner, Carolyn E. ; Lin, Su ; Kolber, Dorota ; Wolfe-Simon, Felisa ; Golbeck, John H. ; Boekema, Egbert J. ; Fromme, Petra. / A novel photosynthetic strategy for adaptation to low-iron aquatic environments. In: Biochemistry. 2011 ; Vol. 50, No. 5. pp. 686-692.
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