Arid
DOI10.1016/j.bbabio.2015.07.008
An easily reversible structural change underlies mechanisms enabling desert crust cyanobacteria to survive desiccation
Bar-Eyal, Leeat1; Eisenberg, Ido2,3; Faust, Adam3,4; Raanan, Hagai1; Nevo, Reinat5; Rappaport, Fabrice6; Krieger-Liszkay, Anja7; Setif, Pierre7; Thurotte, Adrien7; Reich, Ziv5; Kaplan, Aaron1; Ohad, Itzhak1; Paltiel, Yossi2,3; Keren, Nir1
通讯作者Keren, Nir
来源期刊BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS
ISSN0005-2728
EISSN0006-3002
出版年2015
卷号1847期号:10页码:1267-1273
英文摘要

Biological desert sand crusts are the foundation of desert ecosystems, stabilizing the sands and allowing colonization by higher order organisms. The first colonizers of the desert sands are cyanobacteria. Facing the harsh conditions of the desert, these organisms must withstand frequent desiccation hydration cycles, combined with high light intensities. Here, we characterize structural and functional modifications to the photosynthetic apparatus that enable a cyanobacterium, Leptolyngbya sp., to thrive under these conditions.


Using multiple in vivo spectroscopic and imaging techniques, we identified two complementary mechanisms for dissipating absorbed energy in the desiccated state. The first mechanism involves the reorganization of the phycobilisome antenna system, increasing excitonic coupling between antenna components. This provides better energy dissipation in the antenna rather than directed exciton transfer to the reaction center. The second mechanism is driven by constriction of the thylakoid lumen which limits diffusion of plastocyanin to P-700. The accumulation of P-700(+) not only prevents light-induced charge separation but also efficiently quenches excitation energy.


These protection mechanisms employ existing components of the photosynthetic apparatus, forming two distinct functional modes. Small changes in the structure of the thylakoid membranes are sufficient for quenching of all absorbed energy in the desiccated state, protecting the photosynthetic apparatus from photoinhibitory damage. These changes can be easily reversed upon rehydration, returning the system to its high photosynthetic quantum efficiency. (C) 2015 Elsevier B.V. All rights reserved.


英文关键词Photosynthesis Cyanobacteria Desiccation tolerance Desert
类型Article
语种英语
国家Israel ; France
收录类别SCI-E
WOS记录号WOS:000360872100026
WOS关键词FLASH KINETIC-ANALYSIS ; I REACTION-CENTER ; PHOTOSYSTEM-I ; ELECTRON-TRANSFER ; REACTION CENTERS ; CYTOCHROME C(6) ; VIVO ANALYSIS ; OXIDATION ; LIGHT ; PLASTOCYANIN
WOS类目Biochemistry & Molecular Biology ; Biophysics
WOS研究方向Biochemistry & Molecular Biology ; Biophysics
来源机构Hebrew University of Jerusalem
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/186186
作者单位1.Hebrew Univ Jerusalem, Dept Plant & Environm Sci, Alexander Silberman Inst Life Sci, IL-91904 Jerusalem, Israel;
2.Hebrew Univ Jerusalem, Dept Appl Phys, IL-91904 Jerusalem, Israel;
3.Hebrew Univ Jerusalem, Ctr Nanosci & Nanotechnol, IL-91904 Jerusalem, Israel;
4.Hebrew Univ Jerusalem, Inst Chem, IL-91904 Jerusalem, Israel;
5.Weizmann Inst Sci, Dept Biol Chem, IL-76100 Rehovot, Israel;
6.UPMC, CNRS, Inst Biol Physicochim, UMR 7141, Paris, France;
7.Commissariat Energie Atom, Inst Biol & Technol Saclay, F-91191 Gif Sur Yvette, France
推荐引用方式
GB/T 7714
Bar-Eyal, Leeat,Eisenberg, Ido,Faust, Adam,et al. An easily reversible structural change underlies mechanisms enabling desert crust cyanobacteria to survive desiccation[J]. Hebrew University of Jerusalem,2015,1847(10):1267-1273.
APA Bar-Eyal, Leeat.,Eisenberg, Ido.,Faust, Adam.,Raanan, Hagai.,Nevo, Reinat.,...&Keren, Nir.(2015).An easily reversible structural change underlies mechanisms enabling desert crust cyanobacteria to survive desiccation.BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS,1847(10),1267-1273.
MLA Bar-Eyal, Leeat,et al."An easily reversible structural change underlies mechanisms enabling desert crust cyanobacteria to survive desiccation".BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 1847.10(2015):1267-1273.
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