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Table 2 Transitions of the model [4]

From: Yeast pheromone pathway modeling using Petri nets

Symbol

Transition Name

Biological Event

t1

MATalpha_cell(surroundings)

MATα cell secretes its mating pheromone

t2

binding_factor_to_receptor

α-factor binds to the Ste2 receptor

t3

receptor_synthesis

synthesis of the cell surface Sst2

t4

receptor_conformation_change

conformation change of the receptor

t5

division(in_alpha_subunit:GDP) GTP

dissociation of the Gα subunit of the G-protein

t6

hydrolysis_GTP GDP

hydrolysis reassociates Gα with Gβγ

t7

interact_through_Far1

Gβγ interacts Far1 transmitted with Cdc24

t8

Cdc42:GDP GTP

Cdc24 activates Cdc42

t9

active_Cdc42_constitutive_at_pm

constitute active Cdc42 attending the processes

t10

Ste20_input

source of Ste20

t11

Ste20_activated

Cdc42 at plasma membrane and Bem1 activates Ste20

t12

Ste5_input

source of Ste5

t13

Ste5_binds_Ste11

Ste5 binds Ste11

t14

Fus3_synth

synthesis of kinase Fus3

t15

Fus3_binds_Ste7

Ste7 binds Fus3

t16

complex-formation

Ste5/Ste11 binds Ste7/Fus3

t17

Ste20_phos_Ste11

phosphorylation of Ste11 by Ste20

t18

Ste11_phos_Ste7

phosphorylation of Ste7 by Ste11

t19

Ste7_phos_Fus3

phosphorylation of Fus3 by Ste7

t20

Fus3PP-release

release of activation Fus3 out of the MAPK complex

t21

binding_free_Fus3

remaining MAPK complex binds Fus3

t22

Ste12_inhibit_phos

phosphorylation of Ste12 inhibitors Dig1/Dig2 by Fus3PP

t23

Ste12-release

release of Ste12 out of the repression complex

t24

Ste12_phos

phosphorylation of Ste12 by Fus3PP

t25

transcr_activation

transcription activation of pheromone regulated genes

t26

Fus3PP_dephos

dephosphorylation of Fus3PP by Msg5

t27

repression_through_Fus3

Ste12 repression through inactive Fus3 and Dig1/Dig2

t28

cell_fusion

processes leading to the fusion of the two haploid cells

t29

transport_out_of_cell

Bar1 transport into the cell environment

t30

factor_destruction

Bar1 transmitted destruction of the α-factor

t31

Far1_phos

phosphorylation of Far1 by Fus3PP

t32

cell_cycle_arrest_in_G1

Far1 caused arrest in the cell cycle phase G1

t33

transport_out_of_cell

Bar1 transport into the cell environment

t34

Sst2_phos

phosphorylation of Far1 by Fus3PP

t35

transport_out_of_nucleus

Sst2 transport out of the nucleus

t36

accelerated_hydr_GTP GDP

accelerated hydrolysis reassociates the G-protein

t37

Ste11_neg_phos

Fus3PP labels the MAPK complex at Ste11 for degradation

t38

degradation

degradation of the MAPK complex

t39

Ste7_neg_phos

Fus3PP labels the MAPK complex at Ste7 for degradation

t40

Ste7_phos_Kss1

phosphorylation of Kss1 by Ste7

t41

accelerated-dephos-Kss1

deactivation of phosphorylation Kss1 by Fus3PP

t42

Kss1_dephos

dephosphorylation of phosphorylated Kss1 by Msg5

t43

repression_through_Kss1

Ste12 repression through inactive Kss1 by Msg5

t44

tech_input

techinal:the repressed Ste12 complex assumed to be present

t45

Akr_synthesis

synthesis of Akr1

t46

Akr1_binds_Yck1/Yck2

Akr1 binds Yck1/Yck2

t47

receptor_phos

labelling of Ste2 for degradation

t48

ubiquit_endocytosis

ubiquitination and endocytosis of the receptor