Difference between revisions of "Phosphofructokinase type 1"
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*<math>Km_{ADP} = 1.4</math> for ''Thermotoga maritima'' is being reported in Hansen, T., M. Musfeldt ''et. al.'' <ref name="Hansen">Hansen, T., M. Musfeldt, and P. Schonheit (2002), ''ATP-dependent 6-phosphofructokinase from the hyperthermophilic bacterium Thermotoga maritima: characterization of an extremely thermophilic, allosterically regulated enzyme''. Arch. Microbiol. 177:401-409 </ref> and <math>Km_{Fru1,6BP} = 16.7</math> for ''Desulfurococcus amylolyticus'' is reported in Hansen T, Schönheit P. ''et. al.''<ref name=Hansen_2003">Hansen T, Schönheit P. (2003),''Purification and Characterization of the MQH2:NO Oxidoreductase from the Hyperthermophilic Archaeon Pyrobaculum aerophilum'', J Biol Chem, 278 (38), 35861-35868 </ref>. The mean and std. dev. is calculated as <math>0.945 \pm 0.454</math> | *<math>Km_{ADP} = 1.4</math> for ''Thermotoga maritima'' is being reported in Hansen, T., M. Musfeldt ''et. al.'' <ref name="Hansen">Hansen, T., M. Musfeldt, and P. Schonheit (2002), ''ATP-dependent 6-phosphofructokinase from the hyperthermophilic bacterium Thermotoga maritima: characterization of an extremely thermophilic, allosterically regulated enzyme''. Arch. Microbiol. 177:401-409 </ref> and <math>Km_{Fru1,6BP} = 16.7</math> for ''Desulfurococcus amylolyticus'' is reported in Hansen T, Schönheit P. ''et. al.''<ref name=Hansen_2003">Hansen T, Schönheit P. (2003),''Purification and Characterization of the MQH2:NO Oxidoreductase from the Hyperthermophilic Archaeon Pyrobaculum aerophilum'', J Biol Chem, 278 (38), 35861-35868 </ref>. The mean and std. dev. is calculated as <math>0.945 \pm 0.454</math> | ||
− | * Similarly for <math>Km_{Fru1,6BP} = 7.6</math> | + | * Similarly for <math>Km_{Fru1,6BP} = 7.6</math> in ''Thermotoga maritima'' is being reported in Hansen, T., M. Musfeldt ''et. al.'' <ref name="Hansen"></ref> and <math>Km_{ADP} = 0.49</math> in ''Desulfurococcus amylolyticus'' is reported in Hansen T, Schönheit P. ''et. al.''<ref name="Hansen_2003"></ref>. The mean and std. dev. is calculated as <math>12.15 \pm 4.54</math> |
* Four Keq values have been reported in the SilicoTrypWiki (Wikipedia for insilico modelling of Trypanosome) for Phosphofructokinase: 308.4, 254, 1035, 800. Taking the mean and std. dev. of this value is <math> 599.35 \pm 329.38</math> <ref name="SilicoTryp">[[http://silicotryp.ibls.gla.ac.uk/wiki/Phosphofructokinase Silicotryp]]</ref> | * Four Keq values have been reported in the SilicoTrypWiki (Wikipedia for insilico modelling of Trypanosome) for Phosphofructokinase: 308.4, 254, 1035, 800. Taking the mean and std. dev. of this value is <math> 599.35 \pm 329.38</math> <ref name="SilicoTryp">[[http://silicotryp.ibls.gla.ac.uk/wiki/Phosphofructokinase Silicotryp]]</ref> |
Revision as of 11:20, 25 April 2014
The enzyme Phosphofructokinase Type-1 uses another ATP molecule to transfer a phosphate group to Fru6P to form fructose 1, 6-bisphosphate. PFK-1 is an allosteric enzyme showing cooperative behaviour with Fru6P and hyperbolic kinetics with ATP.
Contents
Chemical equation
![Fru6P + ATP \rightleftharpoons Fru1,6BP + ADP](/wiki/images/math/f/9/3/f931feed721084327fc70fe25f43784b.png)
Rate equation
The concerted transition model of Monod, Wyman and Changeux (MWC model) is used as a rate equation for this tetrameric enzyme for considering exclusive ligand binding (F6P, activators and inhibitors) together with mixed type activation, (Fru2,6BP or AMP or Pi) [1].
Parameter values
Parameter | Value | Units | Organism | Remarks |
---|---|---|---|---|
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0.031 [1] | ![]() |
HeLa cell line | Moreno-Sánchez, Marín-Hernández, Encalada & Saavedra, unpublished results |
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1.0 [1] | mM | ||
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0.021[1] | mM | ||
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20[1] | mM | ||
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6.8[1] | mM | ||
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mM | ||
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0.32[1] | Dimensionless | ||
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0.98[1] | Dimensionless | ||
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4.1[1] | Dimensionless | ||
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5[1] | mM | ||
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5[1] | mM | ||
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247[1] | mM | Recalculated from the ![]() |
Parameters with uncertainty
- The
and
in the rate equation represents the factors by which the ligand affinity and catalytic capacity are modified in the presence of an allosteric activatory [2]. As
is the only activator in our model we considered the
and
value of
,
and
. These two values are measured in the presence of 140
medium [2].
- The Vm value is reported as Failed to parse (Cannot store math image on filesystem.): 56 \pm 23
(nmol/min/mg protein). HeLa cells were harvested at a concentration of 65 mg protein/ml [2]. Converting Vm to mM/min becomes Failed to parse (Cannot store math image on filesystem.): 0.00364 \pm 0.001495
again in the presence of 140
.
for Thermotoga maritima is being reported in Hansen, T., M. Musfeldt et. al. [3] and
for Desulfurococcus amylolyticus is reported in Hansen T, Schönheit P. et. al.[4]. The mean and std. dev. is calculated as
- Similarly for
in Thermotoga maritima is being reported in Hansen, T., M. Musfeldt et. al. [3] and
in Desulfurococcus amylolyticus is reported in Hansen T, Schönheit P. et. al.[5]. The mean and std. dev. is calculated as
- Four Keq values have been reported in the SilicoTrypWiki (Wikipedia for insilico modelling of Trypanosome) for Phosphofructokinase: 308.4, 254, 1035, 800. Taking the mean and std. dev. of this value is
[6]
Parameter | Value | Units |
---|---|---|
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Failed to parse (Cannot store math image on filesystem.): 0.00364 \pm 0.001495 | ![]() |
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mM |
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mM |
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20[1] | mM |
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mM |
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mM |
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Dimensionless |
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Dimensionless |
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Dimensionless |
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mM |
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mM |
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References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 Marín-Hernández A, Gallardo-Pérez JC, Rodríguez-Enríquez S et al (2011). Modeling cancer glycolysis. Biochim Biophys Acta, 1807:755–767 (doi)
- ↑ 2.0 2.1 2.2 2.3 R. Moreno-Sánchez, A. Marín-Hernández, J.C. Gallardo-Pérez, H. Quezada, R. Encalada, S. Rodríguez-Enríquez et al. (2012), Phosphofructokinase type 1 kinetics, isoform expression, and gene polymorphisms in cancer cells, J Cell Biochem, 113, pp. 1692–1703
- ↑ 3.0 3.1 Hansen, T., M. Musfeldt, and P. Schonheit (2002), ATP-dependent 6-phosphofructokinase from the hyperthermophilic bacterium Thermotoga maritima: characterization of an extremely thermophilic, allosterically regulated enzyme. Arch. Microbiol. 177:401-409
- ↑ Hansen T, Schönheit P. (2003),Purification and Characterization of the MQH2:NO Oxidoreductase from the Hyperthermophilic Archaeon Pyrobaculum aerophilum, J Biol Chem, 278 (38), 35861-35868
- ↑ Cite error: Invalid
<ref>
tag; no text was provided for refs namedHansen_2003
- ↑ [Silicotryp]