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@ARTICLE{BarEyal:838861,
      author       = {Bar Eyal, Leeat and Ranjbar Choubeh, Reza and Cohen, Eyal
                      and Eisenberg, Ido and Tamburu, Carmen and Dorogi, Márta
                      and Ünnep, Renata and Appavou, Marie-Sousai and Nevo,
                      Reinat and Raviv, Uri and Reich, Ziv and Garab, Győző and
                      van Amerongen, Herbert and Paltiel, Yossi and Keren, Nir},
      title        = {{C}hanges in aggregation states of light-harvesting
                      complexes as a mechanism for modulating energy transfer in
                      desert crust cyanobacteria},
      journal      = {Proceedings of the National Academy of Sciences of the
                      United States of America},
      volume       = {114},
      number       = {35},
      issn         = {1091-6490},
      address      = {Washington, DC},
      publisher    = {National Acad. of Sciences},
      reportid     = {FZJ-2017-07371},
      pages        = {9481 - 9486},
      year         = {2017},
      abstract     = {In this paper we propose an energy dissipation mechanism
                      that is completely reliant on changes in the aggregation
                      state of the phycobilisome light-harvesting antenna
                      components. All photosynthetic organisms regulate the
                      efficiency of excitation energy transfer (EET) to fit light
                      energy supply to biochemical demands. Not many do this to
                      the extent required of desert crust cyanobacteria. Following
                      predawn dew deposition, they harvest light energy with
                      maximum efficiency until desiccating in the early morning
                      hours. In the desiccated state, absorbed energy is
                      completely quenched. Time and spectrally resolved
                      fluorescence emission measurements of the desiccated desert
                      crust Leptolyngbya ohadii strain identified (i) reduced EET
                      between phycobilisome components, (ii) shorter fluorescence
                      lifetimes, and (iii) red shift in the emission spectra,
                      compared with the hydrated state. These changes coincide
                      with a loss of the ordered phycobilisome structure, evident
                      from small-angle neutron and X-ray scattering and
                      cryo-transmission electron microscopy data. Based on these
                      observations we propose a model where in the hydrated state
                      the organized rod structure of the phycobilisome supports
                      directional EET to reaction centers with minimal losses due
                      to thermal dissipation. In the desiccated state this
                      structure is lost, giving way to more random aggregates. The
                      resulting EET path will exhibit increased coupling to the
                      environment and enhanced quenching.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / Neutronenstreuung ; JCNS-1},
      ddc          = {000},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106},
      pnm          = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
                      Neutron Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)KWS2-20140101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:28808031},
      UT           = {WOS:000408536000067},
      doi          = {10.1073/pnas.1708206114},
      url          = {https://juser.fz-juelich.de/record/838861},
}