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Cytochrome b6f complex
The
cytochrome
b
6
f
complex
(plastoquinol—plastocyanin reductase; ) is an enzyme found in the
thylakoid
membrane in
chloroplasts
of plants,
cyanobacteria
, and
green algae
, that catalyze the transfer of electrons from
plastoquinol
to
plastocyanin
. The reaction is analogous to the reaction catalyzed by
cytochrome bc
1
(Complex III) of the
mitochondrial
electron transport chain
. During
photosynthesis
, the cytochrome b
6
f complex transfers
electrons
from
Photosystem II
to
Photosystem I
, whereby pumping protons into the thylakoid space and creating an electrochemical (energy) gradient where it is later used to create
adenosine triphosphate
(ATP).
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