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SUMMARY:Light harvesting complexes in oxygenic photosynthesis - Dr Julia W
 alter\, Kromdijk group
DTSTART:20200604T120000Z
DTEND:20200604T123000Z
UID:TALK142735@talks.cam.ac.uk
CONTACT:71002
DESCRIPTION:Throughout evolution\, photosynthetic complexes have been high
 ly conserved in thylakoid membranes of organisms performing oxygenic photo
 synthesis. Cyanobacteria were the first to evolve this primary metabolic p
 athway and are claimed to be the evolutionary progenitors of photosynthesi
 sing chloroplasts. Both the chloroplast and cyanobacteria contain an exten
 sive system of thylakoid membranes\, which harbour the four main component
 s for photosynthetic light reactions: Photosystems I and II\, the cytochro
 me b6f complex and the ATP synthase complex. A striking difference between
  cyanobacterial and plant-type photosynthesis\, however\, is the arrangeme
 nt and composition of light harvesting antenna complexes. In cyanobacteria
 \, a large antenna system\, called the phycobilisome\, is attached to the 
 stromal surface of the photosystems\, whereas in chloroplasts the LHC comp
 lexes are embedded within the thylakoid membrane in close proximity to the
  photosystem reaction centres. In this presentation\, I will highlight 1) 
 regulation mechanisms of light harvesting involving the only calcium senso
 r protein in the multicellular model cyanobacterium Anabaena sp. PCC 7120\
 , and the role of calcium signalling in cyanobacteria in general\; and 2) 
 the specific roles of carotenoid pigments in light harvesting and correlat
 ed non-photochemical quenching mechanisms in chloroplasts of higher plant 
 model species.
LOCATION:Online
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