Journal
BIOCHEMISTRY
Volume 50, Issue 5, Pages 686-692Publisher
AMER CHEMICAL SOC
DOI: 10.1021/bi1009425
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Funding
- National Science Foundation (NSF) [MCB-0417142, DBI-0511972]
- Netherlands Organisation for Scientific Research (NWO)
- U.S. Department of Energy, Basic Energy Sciences, Division of Material Sciences and Engineering [DE-FG-05-05-ER46222]
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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.
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