Projects

Navigation
To browse the projects in the ontology view use either the graphical scheme below or the navigation panel on the left. The root level is displayed after clicking on the Projects button in the main menu bar at the top of the screen. For switching to model view, click on the project name in the navigation tree.

The central feature of the ontology view is the graphical scheme representing the projection of the project to respective biological structures. The graphical scheme is active, the individual model parts implemented in the project are emphasized yellow when moving the mouse over them. After clicking on any implemented part, the scheme is zoomed in. The description panel at the bottom contains all the detailed information relevant for the currently focused project level.

Annotations Tab
All the annotation terms relevant for the currently focused level of the project are displayed on the Annotation Tab below the scheme. Individual annotation data can be unfolded by clicking on the requested annotation item header.

Components Tab
The Components Tab displays all the model species (state variables) relevant for the currently focused project level. Annotation data for particular components are accessible after clicking on the requested component header.

Reactions Tab
Reactions Tab contains information regarding the modeled reactions. After clicking on the particular reaction header, the reacting components and relevant kinetic parameters are displayed.

Parameters Tab
All quantitative parameters are managed under Parameters Tab. Constants are separated from algebraically evaluated parameters.

Simulation Tab
Simulation and SBML export are available by clicking on appropriate buttons at the bottom of the tab. All relevant settings of parameters and initial conditions is listed in respective folders. Folder Options contains parameters of the simulation algorithm.

Photosystem II

"Photosystem II (PSII) is a homodimeric protein-cofactor complex embedded in the thylakoid membrane of higher plants, algae and cyanobacteria that catalyses light-driven charge separation accompanied by the water splitting reaction during oxygenic photosynthesis. PSII consists of three separable subunits: the PSII reaction center (PSII RC), oxygen evolving complex (OEC) and the light-harvesting antenna complex. Primary electron donor of PSII is P680." [ISBN:3527317309, PMID:18313317]
photosystem II
Model states corresponding to the currently selected level:
Initial value: 0
Simulation type: reaction
Initial value: 0
Simulation type: reaction
Initial value: 0
Simulation type: reaction
Initial value: 0
Simulation type: reaction
Initial value: 0
Simulation type: reaction
Initial value: 1
Simulation type: reaction
Initial value: 0
Simulation type: reaction
Initial value: 0
Simulation type: reaction
Initial value: 0
Simulation type: reaction
Initial value: 0
Simulation type: reaction
Initial value: 0
Simulation type: reaction
Initial value: 0
Simulation type: reaction
Initial value: 0
Simulation type: reaction
Initial value: 0
Simulation type: reaction
Initial value: 0
Simulation type: reaction
Initial value: 0.25
Simulation type: reaction
Initial value: 0.75
Simulation type: reaction
Initial value: 0
Simulation type: reaction
Initial value: 0
Simulation type: reaction
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa-/N * S0
Product: P680/Qa-/N, S1
Kinetic rate constant Value
k1 20000
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa-/N * S2
Product: P680/Qa-/N, S3
Kinetic rate constant Value
k1 3330
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa-/N * S2
Product: P680/Qa-/N, S0
Kinetic rate constant Value
k1 1000
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa-/Qb * S0
Product: P680/Qa-/Qb, S1
Kinetic rate constant Value
k1 20000
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa-/Qb * S1
Product: P680/Qa-/Qb, S2
Kinetic rate constant Value
k1 10000
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa-/Qb * S2
Product: P680/Qa-/Qb, S3
Kinetic rate constant Value
k1 3330
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa-/Qb * S3
Product: P680/Qa-/Qb, S0
Kinetic rate constant Value
k1 1000
"When Qa is reduced, it donates its electron to oxidized Qb. This reaction occurs with forward rate constant kAB1 and the reaction is considered reversible with backward rate constant kBA1." []

Function: Mass Action (irreversible)
Reaction rate: kBA1*P680/Qa/Qb-
Product: P680/Qa-/Qb
Kinetic rate constant Value
"When Qa is reduced, it donates its electron to oxidized Qb. This reaction occurs with forward rate constant kAB1 and the reaction is considered reversible with backward rate constant kBA1." []

Function: Mass Action (irreversible)
Reaction rate: kAB1*P680/Qa-/Qb
Product: P680/Qa/Qb-
Kinetic rate constant Value
“When Qb is doubly reduced and protonated (protonation is assumed implicitly), it exchanges with oxidized PQ molecule from the pool leading to presence of oxidized Qb in photosystem II and doubly reduced and protonated PQ molecule (PQH) in the pool. The exchange is is reversible second order reaction with forward and backward rate constants kfB and kbB, respectively.”


Function: Mass Action (irreversible)
Reaction rate: k1*P680/Qa-/Qb * PQH
Product: P680/Qa-/Qb2-, PQ
Kinetic rate constant Value
k1 250
“When Qb is doubly reduced and protonated (protonation is assumed implicitly), it exchanges with oxidized PQ molecule from the pool leading to presence of oxidized Qb in photosystem II and doubly reduced and protonated PQ molecule (PQH) in the pool. The exchange is is reversible second order reaction with forward and backward rate constants kfB and kbB, respectively.”


Function: Mass Action (irreversible)
Reaction rate: k1*P680/Qa-/Qb2- * PQ
Product: PQH, P680/Qa-/Qb
Kinetic rate constant Value
k1 250
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa-/Qb- * S0
Product: P680/Qa-/Qb-, S1
Kinetic rate constant Value
k1 20000
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa-/Qb- * S1
Product: P680/Qa-/Qb-, S2
Kinetic rate constant Value
k1 10000
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa-/Qb- * S2
Product: P680/Qa-/Qb-, S3
Kinetic rate constant Value
k1 3330
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa-/Qb- * S3
Product: P680/Qa-/Qb-, S0
Kinetic rate constant Value
k1 1000
”When Qa is reduced, it donates its electron to singly reduced Qb. This reaction occurs with forward rate constant kAB2 and the reaction is considered reversible with backward rate constant kBA2.”


Function: Mass Action (irreversible)
Reaction rate: kBA2*P680/Qa/Qb2-
Product: P680/Qa-/Qb-
Kinetic rate constant Value
”When Qa is reduced, it donates its electron to singly reduced Qb. This reaction occurs with forward rate constant kAB2 and the reaction is considered reversible with backward rate constant kBA2.”


Function: Mass Action (irreversible)
Reaction rate: kAB2*P680/Qa-/Qb-
Product: P680/Qa/Qb2-
Kinetic rate constant Value
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa-/Qb2- * S0
Product: P680/Qa-/Qb2-, S1
Kinetic rate constant Value
k1 20000
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa-/Qb2- * S1
Product: P680/Qa-/Qb2-, S2
Kinetic rate constant Value
k1 10000
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa-/Qb2- * S2
Product: P680/Qa-/Qb2-, S3
Kinetic rate constant Value
k1 3330
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa-/Qb2- * S3
Product: P680/Qa-/Qb2-, S0
Kinetic rate constant Value
k1 1000
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa-/N * S1
Product: P680/Qa/N, S2
Kinetic rate constant Value
k1 10000
”It occurs in the model between P680 and Qa with rate constant kL2 leading to formation of P680+ and Qa-. Value of kL2 is determined by amount of excitations coming to reaction centre of photosystem II and concentration of chlorophylls in a sample.”


Function: Mass Action (irreversible)
Reaction rate: kL2*P680/Qa/Qb
Product: P680+/Qa-/Qb
Kinetic rate constant Value
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa/Qb * S0
Product: P680/Qa/Qb, S1
Kinetic rate constant Value
k1 20000
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa/Qb * S1
Product: P680/Qa/Qb, S2
Kinetic rate constant Value
k1 10000
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa/Qb * S2
Product: P680/Qa/Qb, S3
Kinetic rate constant Value
k1 3330
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa/Qb * S3
Product: P680/Qa/Qb, S0
Kinetic rate constant Value
k1 1000
“When Qb is doubly reduced and protonated (protonation is assumed implicitly), it exchanges with oxidized PQ molecule from the pool leading to presence of oxidized Qb in photosystem II and doubly reduced and protonated PQ molecule (PQH) in the pool. The exchange is is reversible second order reaction with forward and backward rate constants kfB and kbB, respectively.”


Function: Mass Action (irreversible)
Reaction rate: k1*P680/Qa/Qb * PQH
Product: P680/Qa/Qb2-, PQ
Kinetic rate constant Value
k1 250
“When Qb is doubly reduced and protonated (protonation is assumed implicitly), it exchanges with oxidized PQ molecule from the pool leading to presence of oxidized Qb in photosystem II and doubly reduced and protonated PQ molecule (PQH) in the pool. The exchange is is reversible second order reaction with forward and backward rate constants kfB and kbB, respectively.”


Function: Mass Action (irreversible)
Reaction rate: k1*P680/Qa/Qb2- * PQ
Product: P680/Qa/Qb, PQH
Kinetic rate constant Value
k1 250
”It occurs in the model between P680 and Qa with rate constant kL2 leading to formation of P680+ and Qa-. Value of kL2 is determined by amount of excitations coming to reaction centre of photosystem II and concentration of chlorophylls in a sample.”


Function: Mass Action (irreversible)
Reaction rate: kL2*P680/Qa/Qb-
Product: P680+/Qa-/Qb-
Kinetic rate constant Value
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa/Qb- * S0
Product: P680/Qa/Qb-, S1
Kinetic rate constant Value
k1 20000
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa/Qb- * S1
Product: P680/Qa/Qb-, S2
Kinetic rate constant Value
k1 10000
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa/Qb- * S2
Product: P680/Qa/Qb-, S3
Kinetic rate constant Value
k1 3330
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa/Qb- * S3
Product: P680/Qa/Qb-, S0
Kinetic rate constant Value
k1 1000
”It occurs in the model between P680 and Qa with rate constant kL2 leading to formation of P680+ and Qa-. Value of kL2 is determined by amount of excitations coming to reaction centre of photosystem II and concentration of chlorophylls in a sample.”


Function: Mass Action (irreversible)
Reaction rate: kL2*P680/Qa/Qb2-
Product: P680+/Qa-/Qb2-
Kinetic rate constant Value
Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa/Qb2- * S0
Product: P680/Qa/Qb2-, S1
Kinetic rate constant Value
k1 20000
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa/Qb2- * S1
Product: P680/Qa/Qb2-, S2
Kinetic rate constant Value
k1 10000
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa/Qb2- * S2
Product: P680/Qa/Qb2-, S3
Kinetic rate constant Value
k1 3330
"It leads to formation of Si+1-state and P680 with rate constants k01, k12, k23 and k30 for the S0-S1, S1-S2, S2-S3 and S3-S0 transition, respectively." []

Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa/Qb2- * S3
Product: P680/Qa/Qb2-, S0
Kinetic rate constant Value
k1 1000
"When Qa is reduced, it donates its electron to oxidized Qb. This reaction occurs with forward rate constant kAB1 and the reaction is considered reversible with backward rate constant kBA1." []

Function: Mass Action (irreversible)
Reaction rate: kBA1*P680+/Qa/Qb-
Product: P680+/Qa-/Qb
Kinetic rate constant Value
"When Qa is reduced, it donates its electron to oxidized Qb. This reaction occurs with forward rate constant kAB1 and the reaction is considered reversible with backward rate constant kBA1." []

Function: Mass Action (irreversible)
Reaction rate: kAB1*P680+/Qa-/Qb
Product: P680+/Qa/Qb-
Kinetic rate constant Value
“When Qb is doubly reduced and protonated (protonation is assumed implicitly), it exchanges with oxidized PQ molecule from the pool leading to presence of oxidized Qb in photosystem II and doubly reduced and protonated PQ molecule (PQH) in the pool. The exchange is is reversible second order reaction with forward and backward rate constants kfB and kbB, respectively.”


Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa-/Qb * PQH
Product: P680+/Qa-/Qb2-, PQ
Kinetic rate constant Value
k1 250
“When Qb is doubly reduced and protonated (protonation is assumed implicitly), it exchanges with oxidized PQ molecule from the pool leading to presence of oxidized Qb in photosystem II and doubly reduced and protonated PQ molecule (PQH) in the pool. The exchange is is reversible second order reaction with forward and backward rate constants kfB and kbB, respectively.”


Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa-/Qb2- * PQ
Product: P680+/Qa-/Qb, PQH
Kinetic rate constant Value
k1 250
”When Qa is reduced, it donates its electron to singly reduced Qb. This reaction occurs with forward rate constant kAB2 and the reaction is considered reversible with backward rate constant kBA2.”


Function: Mass Action (irreversible)
Reaction rate: kBA2*P680+/Qa/Qb2-
Product: P680+/Qa-/Qb-
Kinetic rate constant Value
”When Qa is reduced, it donates its electron to singly reduced Qb. This reaction occurs with forward rate constant kAB2 and the reaction is considered reversible with backward rate constant kBA2.”


Function: Mass Action (irreversible)
Reaction rate: kAB2*P680+/Qa-/Qb-
Product: P680+/Qa/Qb2-
Kinetic rate constant Value
“When Qb is doubly reduced and protonated (protonation is assumed implicitly), it exchanges with oxidized PQ molecule from the pool leading to presence of oxidized Qb in photosystem II and doubly reduced and protonated PQ molecule (PQH) in the pool. The exchange is is reversible second order reaction with forward and backward rate constants kfB and kbB, respectively.”


Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa/Qb * PQH
Product: P680+/Qa/Qb2-, PQ
Kinetic rate constant Value
k1 250
“When Qb is doubly reduced and protonated (protonation is assumed implicitly), it exchanges with oxidized PQ molecule from the pool leading to presence of oxidized Qb in photosystem II and doubly reduced and protonated PQ molecule (PQH) in the pool. The exchange is is reversible second order reaction with forward and backward rate constants kfB and kbB, respectively.”


Function: Mass Action (irreversible)
Reaction rate: k1*P680+/Qa/Qb2- * PQ
Product: P680+/Qa/Qb, PQH
Kinetic rate constant Value
k1 250

Constant quantities

Initial value: 3500
Simulation type: fixed
Initial value: 1750
Simulation type: fixed
Initial value: 175
Simulation type: fixed
Initial value: 35
Simulation type: fixed
Initial value: 10
Simulation type: fixed
Initial value: 100
Simulation type: fixed
Initial value: 200
Simulation type: fixed
Initial value: 4000
Simulation type: fixed

Assigned quantities

Initial expression: ((1-0.55)*("P680+/Qa-/Qb"+"P680+/Qa-/Qb-"+"P680+/Qa-/Qb2-"+"P680/Qa-/Qb2-"+"P680/Qa-/Qb"+"P680/Qa-/Qb-")/(1-0.55*("P680+/Qa-/Qb"+"P680+/Qa-/Qb-"+"P680+/Qa-/Qb2-"+"P680/Qa-/Qb2-"+"P680/Qa-/Qb"+"P680/Qa-/Qb-")))/(1+((1/45+(("P680+/Qa-/Qb"+"P680+/Qa-/Qb-"+"P680+/Qa-/Qb2-"+"P680/Qa-/Qb2-"+"P680/Qa-/Qb"+"P680/Qa-/Qb-")*4/36))*"PQ"))
Simulation type: assignment
Initial expression: (1-0.55)*("P680+/Qa-/Qb"+"P680+/Qa-/Qb-"+"P680+/Qa-/Qb2-"+"P680/Qa-/Qb2-"+"P680/Qa-/Qb"+"P680/Qa-/Qb-")/(1-0.55*("P680+/Qa-/Qb"+"P680+/Qa-/Qb-"+"P680+/Qa-/Qb2-"+"P680/Qa-/Qb2-"+"P680/Qa-/Qb"+"P680/Qa-/Qb-"))
Simulation type: assignment
Initial expression: 10^(-(2.16*10^(-7)*1590*"Pc+" + 2.16*10^(-7)*10300*("P700+/Fb"+"P700+/Fb-")))
Simulation type: assignment
Name Value
bL-/bH.c-/f 0
bL-/bH.c-/f- 0
bL-/bH.c/f 0
bL-/bH.c/f- 0
bL-/bH.c2-/f 0
bL-/bH.c2-/f- 0
bL/bH.c-/f 0
bL/bH.c-/f- 0
bL/bH.c/f 1
bL/bH.c/f- 0
bL/bH.c2-/f 0
bL/bH.c2-/f- 0
Fd 3
Fd- 0
FNRa 0
FNRa- 0
FNRa2- 0
FNRi 3
P680+/Qa-/N 0
P680+/Qa-/Qb 0
P680+/Qa-/Qb- 0
P680+/Qa-/Qb2- 0
P680+/Qa/Qb 0
P680+/Qa/Qb- 0
P680+/Qa/Qb2- 0
P680/Qa-/N 0
P680/Qa-/Qb 0
P680/Qa-/Qb- 0
P680/Qa-/Qb2- 0
P680/Qa/N 0
P680/Qa/Qb 1
P680/Qa/Qb- 0
P680/Qa/Qb2- 0
P700+/Fb 0
P700+/Fb- 0
P700/Fb 1
P700/Fb- 0
Pc 3
Pc+ 0
PQ 2.5
PQH 2.5
S0 0.25
S1 0.75
S2 0
S3 0

Constant quantities

Name Value
kAB1 3500
kAB2 1750
kBA1 175
kBA2 35
kbLF 10
kfLF 100
kL1 200
kL2 4000

Assigned quantities

Name Value
Fq(t)
Funq(t)
I820
Name Value
Simulation start 0.000001
Simulation end 1
Simulation tolerance 0.1
Use log time scale 1
Multiplication of time scale 1
Number of steps 200
Label x-axis time [s]