Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/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
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ISSN | 0005-2728 |
EISSN | 0006-3002 |
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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