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SUMMARY:EPR Study of the Oxidation States and the Metalloradical Intermedi
 ate States of the Oxygen Evolving Complex of Photosystem II
DTSTART:20111026T161500
DTSTAMP:20260916T050605Z
UID:75725bd3a6144b9c3694595bf6a11d1868d49ca50f7905def05ffabc
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. Georgia Zahariou\, Institute of Materials Science\, NCSR 
 “Demokritos”\, Greece\nThe light-driven water splitting to molecular o
 xygen is catalyzed by a membrane-protein complex known as Photosystem II. 
 In natural spinach Photosystem II\, the catalytic site of water oxidation\
 , called Oxygen Evolving Complex (OEC)\, contains a tetranuclear Mn cluste
 r (Mn4). During the absorption of four photons by Photosystem II\, the Mn4
  undergoes periodically four oxidation steps: S0 → S1\, S1 → S2\, S2 
 → S3 and S3 → (S4)S0. The intermediates of the S-state transitions inv
 olve the free radical of Tyrosine Z (TyrZ•)\, which interacts magnetical
 ly with Mn cluster. Tyrosine Z (TyrZ) of Photosystem II is in close proxim
 ity with Mn cluster and it is thought to play a critical role in the proto
 n-coupled electron transfer reactions of water to molecular oxygen. The gr
 ound spin-state of the S3 state\, as well as the interaction between TyrZ
 • and Mn cluster (metallo-radical mechanism) to the water oxidation proc
 ess is under investigation. 
LOCATION:PH L1 503
STATUS:CONFIRMED
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