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

doi:10.1021/bi1009425

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 journal › Article › peer-review

45 Scopus citations

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 language	English (US)
Pages (from-to)	686-692
Number of pages	7
Journal	Biochemistry
Volume	50
Issue number	5
DOIs	https://doi.org/10.1021/bi1009425
State	Published - Feb 8 2011

ASJC Scopus subject areas

Biochemistry

Access to Document

10.1021/bi1009425

Cite this

@article{dc23e7bdfe4540128f6d35a097161929,

title = "A novel photosynthetic strategy for adaptation to low-iron aquatic environments",

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.",

author = "Devendra Chauhan and Folea, {I. Mihaela} and Jolley, {Craig C.} and Roman Kou{\^r}il and Lubner, {Carolyn E.} and Su Lin and Dorota Kolber and Felisa Wolfe-Simon and Golbeck, {John H.} and Boekema, {Egbert J.} and Petra Fromme",

year = "2011",

month = feb,

day = "8",

doi = "10.1021/bi1009425",

language = "English (US)",

volume = "50",

pages = "686--692",

journal = "Biochemistry",

issn = "0006-2960",

publisher = "American Chemical Society",

number = "5",

}

TY - JOUR

T1 - A novel photosynthetic strategy for adaptation to low-iron aquatic environments

AU - Chauhan, Devendra

AU - Folea, I. Mihaela

AU - Jolley, Craig C.

AU - Kour̂il, Roman

AU - Lubner, Carolyn E.

AU - Lin, Su

AU - Kolber, Dorota

AU - Wolfe-Simon, Felisa

AU - Golbeck, John H.

AU - Boekema, Egbert J.

AU - Fromme, Petra

PY - 2011/2/8

Y1 - 2011/2/8

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=79952077702&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79952077702&partnerID=8YFLogxK

U2 - 10.1021/bi1009425

DO - 10.1021/bi1009425

M3 - Article

C2 - 20942381

AN - SCOPUS:79952077702

SN - 0006-2960

VL - 50

SP - 686

EP - 692

JO - Biochemistry

JF - Biochemistry

IS - 5

ER -

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

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this