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TZID:Asia/Jerusalem
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UID:1278@biotech.technion.ac.il
DTSTART;TZID=Asia/Jerusalem:20261028T140000
DTEND;TZID=Asia/Jerusalem:20261028T150000
DTSTAMP:20261025T105553Z
URL:https://biotech.technion.ac.il/events/%d7%a1%d7%9e%d7%99%d7%a0%d7%a8-%
 d7%90%d7%95%d7%a8%d7%97-%d7%93%d7%a8-%d7%93%d7%91%d7%99%d7%a8-%d7%94%d7%a8
 %d7%99%d7%a1/
SUMMARY:סמינר אורח: ד"ר דביר הריס
DESCRIPTION:Go with the flow: energetic robustness inbacterial photosynthes
 is\n ** Lecture will be given in English**\nAbstract:\nPhotosynthetic org
 anisms\, such as cyanobacteria and purplebacteria\, optimize solar energy 
 conversion with high efficiency despitefluctuating environmental condition
 s. Cyanobacteria utilize large PSI-IsiAsuper complexes to sustain themselv
 es under bioavailable iron scarcity. Wefound that the Cryo-EM structure of
  PSI-IsiA from Synechocystis PCC 6803reveals significant structural hetero
 geneity within the complex\, yetsingle-molecule fluorescence spectroscopy 
 experiments confirm consistent energytransfer efficiency. This efficiency 
 is maintained or even enhanced in certainconformations through specific ch
 lorophyll arrangements. Similarly\, purplebacteria employ chromatic acclim
 ation to tune their photosynthetic machineryunder low-light conditions\, r
 eplacing LH2 to LH3 antenna complexes\, havingdifferent protein-chromophor
 e interactions to manage spectral tuning. We showhow this is achieved usin
 g cryo-EM\, and provide evidence for the uniqueenergetic dynamic of the Rb
 l. acidophilus 7750 strain using ultrafast transientabsorption spectroscop
 y. This unique dynamic is achieved thanks to a specificgeometry allowing u
 phill energy transfer between absorption bands. Both systemsdemonstrate me
 chanisms where sophisticated design support robust energy transfer\,sugges
 ting a common theme in photosynthetic organisms to mitigate the impactsof 
 environmental changes by harness structural changes to keep high energycon
 version efficiency.
CATEGORIES:סמינרים
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DTSTART:20261025T010000
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