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. 2022 Feb 18;33(3):ar23. doi: 10.1091/mbc.E20-08-0545

TABLE 1:

One set of parameters for each of the three models.

Associations (l/mol s) Dissociations (/s) Transformations (/s) Initial conditions
Figure 4C. RasGAP activated by Ga2 and RasGTPa Ligand_GPCR binding—10,000,000 Ligand_act-GPCR dissoc—1 GPCR-basal: 50
Ligand_GPCR Receptor_Gabg Receptor_Gabg binding—50,000 rec act ga gdp dissoc—0.01 GPCR activation—3 Ga2_Gbg_3 basal: 50
rec act ga gtp dissoc—10 Ras-GDP: 50
rec inact ga dissoc—10 RasGAP_basal: 1e-06
Ga2_Gbg GDP-Ga_Gbg assoc—1e-06 Ga-GTP_Gbg dissoc—10
gabg-gdp dissoc—1e-03
Ga2 G alpha auto GTPase—3
Ga2_Rasgap Ga2-GDP_RasGAP inact assoc—0.01 Ga2-GTP_RasGAP dissoc—2e-03 Ga2-GTP_RasGAP activation—100
Ga2-GTP_RasGAP assoc—0.01 Ga2-GDP_RasGAP inact dissoc—2e-03
RasGAP_Ga2-GTP assoc—1e06
Gbg_Ras Gbg_Ras assoc—1e-06 Gbg_Ras dissoc—1e-03 Gbg_Ras activation—100
Ras_RasGAP Ras_RasGAP assoc—1e-08 Ras-GTP_RasGAP dissoc—1e-03 Ras-GTP_RasGAP activation—100
RasGAP_RasGTP assoc—1e-05 Ras_RasGAP dissoc—1e-03 Ras_RasGAP deactivation—1e-03
RasGDP_RasGAP inactive assoc—-0.1 RasGDP_RasGAP inactive dissoc—0.1
RasGAP RasGAP deactivation—0.03
Figure 4A. RasGAP is activated by Ga2b
Ligand_GPCR Ligand_GPCR binding— 10,000,000 Ligand_act-GPCR dissoc—1 GPCR-basal: 50
Receptor_Gabg Receptor_Gabg binding—50,000 rec act ga gdp dissoc—0.01 GPCR activation—3 Ga2_Gbg_3 basal: 50
rec act ga gtp dissoc—10 Ras-GDP: 50
rec inact ga dissoc—10 RasGAP_8: 0.0001
Ga2_Gbg GDP-Ga_Gbg assoc—1e-06 Ga-GTP_Gbg dissoc—10
gabg-gdp dissoc—1e-03
Ga2 G alpha auto GTPase—3
Ga2_Rasgap Ga2-GDP_RasGAP inact assoc—0.01 Ga2-GTP_RasGAP dissoc—2e-03 Ga2-GTP_RasGAP activation—100
Ga2-GTP_RasGAP assoc—0.01 Ga2-GDP_RasGAP inact dissoc—2e-03
RasGAP_Ga2-GTP assoc—1e-06
Gbg_Ras Gbg_Ras assoc—1e-06 Gbg_Ras dissoc—1e-03 Gbg_Ras activation—100
Ras_RasGAP Ras_RasGAP assoc—1e-07 Ras-GTP_RasGAP dissoc—0 Ras-GTP_RasGAP activation—0
RasGAP_RasGTP assoc—0 Ras_RasGAP dissoc—1e-09 Ras_RasGAP deactivation—1e-03
RasGDP_RasGAP inactive assoc—0 RasGDP_RasGAP inactive dissoc—0
RasGAP RasGAP deactivation—0.06
Ras Ras auto GTPase—3
Figure 4B. RasGAP is activated by Rasc
Ligand_GPCR Ligand_GPCR binding—10,000,000 Ligand_act-GPCR dissoc—1 GPCR-basal: 50
Receptor_Gabg Receptor_Gabg binding—50,000 rec act ga gdp dissoc—0.01 GPCR activation—3 Ga2_Gbg_3 basal: 50
rec act ga gtp dissoc—10 Ras-GDP: 50
rec inact ga
dissoc—10
RasGAP_basal: 1e-06
Ga2_Gbg GDP-Ga_Gbg assoc—1e-06 Ga-GTP_Gbg dissoc—10
gabg-gdp dissoc—1e-03
Ga2 G alpha auto GTPase—3
Ga2_Rasgap Ga2-GDP_RasGAP inact assoc—0 Ga2-GTP_RasGAP dissoc—0 Ga2-GTP_RasGAP activation—0
Ga2-GTP_RasGAP assoc—0 Ga2-GDP_RasGAP inact dissoc—0
RasGAP_Ga2-GTP assoc—0
Gbg_Ras Gbg_Ras assoc—1e-07 Gbg_Ras dissoc—1e-03 Gbg_Ras activation—1e-03
Ras_RasGAP Ras_RasGAP assoc—1e-09 Ras-GTP_RasGAP dissoc—1e-05 Ras-GTP_RasGAP activation—100
RasGAP_RasGTP assoc—1e-06 Ras_RasGAP dissoc—1e=04 Ras_RasGAP deactivation—1e-09
RasGDP_RasGAP inactive assoc—0.1 RasGDP_RasGAP inactive dissoc—0.1
RasGAP RasGAP deactivation—0.03

Diffusion coefficients [m^2/s]. Member proteins: GPCR: 1.0e-15, Ras: 1.0e-13, Gβγ: 1.0e-13, and Gα 1.0e-13. All cytosolic components (such as RasGAP) 1.0 e-11.

The set of parameters for the model of Figure 4C in which RasGAP is activated by both Gα-GTP and Ras-GTP.

The set of parameters for the model of Figure 4A in which RasGAP is activated by Gα-GTP.

The set of parameters for the model of Figure 4B in which RasGAP is activated by Ras-GTP.