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UID:69dc33338942f
DTSTAMP:20260412T200507
DTSTART:20161003T113000
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DTEND:20161003T123000
URL:https://murmitoyen.com/events/vanille/udem/detail/687805-dynamics-of-ph
 otosynthetic-light-harvesting-from-conformational-changes-to-excitation-en
 ergy-transfer-gabriela-schlau-cohen-mit
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:Dynamics of photosynthetic light harvesting:  from conformational c
 hanges to excitation energy transfer - Gabriela Schlau-Cohen (MIT)
DESCRIPTION:Gabriela Schlau-Cohen\, Chemistry Departement\, MIT
\n 
\nAbst
 ract: In photosynthetic light harvesting\, absorbed energy migrates throug
 h a protein network to reach a dedicated location for conversion to chemic
 al energy. This energy flow is efficient\, directional\, and\, in oxygenic
  photosynthesis\, regulated. The regulatory response\, known as non-photoc
 hemical quenching (NPQ)\, safely dissipates excess energy to protect the s
 ystem against deleterious photoproducts. In recent research\, a protein wi
 thin this network\, light- harvesting complex stress related (LHCSR)\, has
  been implicated in dissipation in green algae and moss\, yet the mechanis
 ms of photoprotection remain poorly understood. We explore these mechanism
 s with single-molecule spectroscopy of LHCSR. By characterizing the confor
 mational dynamics\, we identify the extent of energy dissipation in single
  LHCSR proteins and how this changes under conditions that mimic high and 
 low light. While this approach reveals the conformational dynamics of solu
 bilized photosynthetic proteins\, we also present experiments measuring ul
 trafast energy transfer dynamics for proteins held within a near-native me
 mbrane environment. Together\, these experiments explore how the protein n
 etwork produces an efficient and adaptable energy flow.
\nYou can consult 
 Prof. Schlau-Cohen's research group web page at www.schlaucohenlab.com.
\n
 Cette conférence est présentée par le RQMP Versant Nord du Départemen
 t de physique de l'Université de Montréal et le Département de génie
  physique de Polytechnique Montréal.
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