Repository > Holzwarth_2006

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+ Holzwarth_2006
+ Photosynthetic apparatus
+ Thylakoid membrane
+ Photosystem II
+ 'P680'
o P680
o P680+
+ 'Qa'
o Qa
o Qa-
+ 'PhD1'
o PhD1
o PhD1-
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o ac
o ac*
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+ Lazár_2009
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+ 'Qa'
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+ 'P680'
o P680+
o P680
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o Qb
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o Pc
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Holzwarth_2006


Holzwarth AR, Mueller, Reus M, Nowaczyk M, Sander J and Roegner M (2006) Kinetics and mechanism of electron transfer in intact photosystem II and in the isolated reaction center: pheophytin is the primary electron acceptor. Proc Natl Acad Sci U S A 103: 6895-6900
Annotations
Components
Reactions
Parameters
Simulation
+publication:Holzwarth (2006)
Holzwarth AR, Mueller, Reus M, Nowaczyk M, Sander J and Roegner M (2006) Kinetics and mechanism of electron transfer in intact photosystem II and in the isolated reaction center: pheophytin is the primary electron acceptor. Proc Natl Acad Sci U S A 103: 6895-6900
DOIi:10.1073/pnas.0505371103
Model components grouped by compartments:
+Thylakoid
Initial value: 1
Simulation type: fixed
+P680 / Qa / PhD1 / ac / ChlD1
Initial value: 0
Simulation type: reaction
+P680 / Qa / PhD1 / ac / ChlD1*
Initial value: 0
Simulation type: reaction
+P680 / Qa / PhD1 / ac* / ChlD1
Initial value: 1
Simulation type: reaction
+P680 / Qa / PhD1- / ac / ChlD1+
Initial value: 0
Simulation type: reaction
+P680+ / Qa / PhD1- / ac / ChlD1
Initial value: 0
Simulation type: reaction
+P680+ / Qa- / PhD1 / ac / ChlD1
Initial value: 0
Simulation type: reaction
+Antenna de-excitation (fluorescence)

"Excitation delocalized into all antenna chlorophylls, ac, is radiatively lost via fluorescence emission."



Function: Mass Action (irreversible)
Reaction rate: kF*P680 / Qa / PhD1 / ac* / ChlD1
Product: P680 / Qa / PhD1 / ac / ChlD1
Kinetic rate constant Value
kF 67000000
+Antenna de-excitation (heat)

"Excitation delocalized into all antenna chlorophylls, ac, is non-radiatively lost via heat dissipation."



Function: Mass Action (irreversible)
Reaction rate: k1*P680 / Qa / PhD1 / ac* / ChlD1
Product: P680 / Qa / PhD1 / ac / ChlD1
Kinetic rate constant Value
k1 200000
+Charge recombination
"The primary charge separation in photosystem II between the primary electron donor, ChlD1, and the primary electron acceptor, pheophytin PhD1, is a reversible process accompanied by the charge recombination between the electron donor and electron acceptor leading to formation of the excited state of the primary electron donor in photosystem II."


Function: Mass Action (irreversible)
Reaction rate: k1*P680 / Qa / PhD1- / ac / ChlD1+
Product: P680 / Qa / PhD1 / ac / ChlD1*
Kinetic rate constant Value
k1 500000000000
+ChlD1+ reduction by P680

"The oxidized primary electron donor in photosystem II, ChlD1, is reduced by electron donated by the secondary electron donor in photosystem II, P680, which was originally thought to be the primary electron donor in photosystem II."



Function: Mass Action (irreversible)
Reaction rate: k1*P680 / Qa / PhD1- / ac / ChlD1+
Product: P680+ / Qa / PhD1- / ac / ChlD1
Kinetic rate constant Value
k1 250000000000
+Energy transfer between A and ChlD1
"Excitation delocalized into all antenna chlorophylls, ac, is reversibly transferred to the primary electron donor in photosystem II, ChlD1."


Function: Mass Action (reversible)
Reaction rate: k1*P680 / Qa / PhD1 / ac* / ChlD1-k2*P680 / Qa / PhD1 / ac / ChlD1*
Product: P680 / Qa / PhD1 / ac / ChlD1*
Kinetic rate constant Value
k1 19200000000
k2 25000000000
+Primary charge separation

"After excitation of the primary electron donor in photosystem II, ChlD1, the primary charge separation between the primary electron donor and the primary electron acceptor, pheophytin PhD1, in photosystem II occurs."



Function: Mass Action (irreversible)
Reaction rate: k1*P680 / Qa / PhD1 / ac / ChlD1*
Product: P680 / Qa / PhD1- / ac / ChlD1+
Kinetic rate constant Value
k1 500000000000
+Qa reduction by PhD1-

"The charge stabilization in photosystem II occurs by means of reduction of the primary quinone electron acceptor in photosystem II, Qa, by the reduced primary electron acceptor in photosystem II, pheophytin PhD1."



Function: Mass Action (irreversible)
Reaction rate: k1*P680+ / Qa / PhD1- / ac / ChlD1
Product: P680+ / Qa- / PhD1 / ac / ChlD1
Kinetic rate constant Value
k1 4800000000
+RC de-excitation (fluorescence)
"Excited state of the primary electron donor in photosystem II, ChlD1, is radiatively lost via fluorescence emission."


Function: Mass Action (irreversible)
Reaction rate: kF*P680 / Qa / PhD1 / ac / ChlD1*
Product: P680 / Qa / PhD1 / ac / ChlD1
Kinetic rate constant Value
kF 67000000
+RC de-excitation (heat)
"Excited state of the primary electron donor in photosystem II, ChlD1, is non-radiatively lost via heat dissipation."


Function: Mass Action (irreversible)
Reaction rate: k1*P680 / Qa / PhD1 / ac / ChlD1*
Product: P680 / Qa / PhD1 / ac / ChlD1
Kinetic rate constant Value
k1 200000
+Reverse electron flow from ChlD1 to P680+

"The reduction of oxidized primary electron donor in photosystem II, ChlD1, by the secondary electron donor in photosystem II, P680, is a reversible process accompanied by reverse electron flow from the reduced primary electron donor back to the oxidized secondary electron donor."



Function: Mass Action (irreversible)
Reaction rate: k1*P680+ / Qa / PhD1- / ac / ChlD1
Product: P680 / Qa / PhD1- / ac / ChlD1+
Kinetic rate constant Value
k1 67000000000
+Reverse electron flow from Qa- to PhD1
"The charge stabilization in photosystem II by means of reduction of the primary quinone electron acceptor in photosystem II, Qa, by the reduced primary electron acceptor in photosystem II, pheophytin PhD1, is a reversible process accompanied by reverse electron flow from the reduced primary quinone electron acceptor back to the oxidized primary electron acceptor."


Function: Mass Action (irreversible)
Reaction rate: k1*P680+ / Qa- / PhD1 / ac / ChlD1
Product: P680+ / Qa / PhD1- / ac / ChlD1
Kinetic rate constant Value
k1 2400000000

Constant quantities

+kF
Initial value: 67000000
Simulation type: fixed

Assigned quantities

+F(t)
Initial expression: "kF" * ( "P680 / Qa / PhD1 / ac* / ChlD1" + "P680 / Qa / PhD1 / ac / ChlD1*" )
Simulation type: assignment
+Initial conditions
Name Value
P680 / Qa / PhD1 / ac / ChlD1 0
P680 / Qa / PhD1 / ac / ChlD1* 0
P680 / Qa / PhD1 / ac* / ChlD1 1
P680 / Qa / PhD1- / ac / ChlD1+ 0
P680+ / Qa / PhD1- / ac / ChlD1 0
P680+ / Qa- / PhD1 / ac / ChlD1 0
+Parameters

Constant quantities

Name Value
kF 67000000

Assigned quantities

Name Value
F(t)
+Options
Name Value
Simulation end 0.002
Use log time scale 1
Multiplication of time scale 10
Simulation start 0.0000000000001
Number of steps 100
Label x-axis time [s]
Label y-axis rel. units

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