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PSI
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PSII
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1.PSI is located at the outer surface of
the grana thylakoid membrane. (non-appressed region ans stroma lamella)
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1. PSII is located at the inner surface
of the grana thylakoid membrane. (appressed granal region)
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2. The photocenter or reaction center in
PSI is P700.
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2. The photocenter in PSII is P680.
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3. PSI has an iron-sulfur (Fe-S) type
reaction center (or type-I).
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3. PSII has a quinone type reaction center
(also known as Q-type).
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4. The core complex of PSI is composed by
a smaller number of proteins (15 subunits)
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4. The core complex of PSII is a
multi-complex composed of about 25-30 subunits.
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5. Pigments absorb longer wavelength of
light (>680nm)
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5. Pigments absorb shorter wavelength of
light (<680 nm)
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6. Participate cyclic and non-cyclic
phosphorylation.
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6. Participate only cyclic
phosphorylation.
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7. PSI takes electrons from plastocyanin
and reduces ferredoxin.
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7. PSII
splits water to form proton and O2 and reduces plastoquinone.
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Saturday, December 22, 2018
Differentiate between PS I and PS II
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