Difference between revisions of "Transformation of AA to 12-HPETE"
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|+ style="text-align: left;" | Description of the 12-LOX Kmp distribution | |+ style="text-align: left;" | Description of the 12-LOX Kmp distribution |
Revision as of 06:54, 16 May 2019
LOX enzymes oxidise AA to generate hydroxy fatty acids. In the skin, the 12-LOX isoform of LOX is more active than others. This isoform is highly expressed in the resident cells of both compartments, epidermal keratinocytes and dermal fibroblasts (Dowd, Kobza Black et al. 1985). The 12- LOX enzyme catalyses the addition of O2 at the C-12 position of AA, producing 12-HPETE.
Contents
Reaction
Chemical equation
Rate equation
Enzyme Parameters
Kms
Value | Units | Species | Notes | Reference |
---|---|---|---|---|
7.20E-03 | Human | Expression Vector: Platelet
Enzyme: 12-Lipoxygenase pH: 7.4 Temperature: 37°C. |
[1] | |
8.00E-02 | Human | Expression Vector: Platelet
Enzyme: 12-Lipoxygenase pH: 7 Temperature: 24 |
[2] | |
1.00E-02 | Human Platlet | Expression Vector: Baculovirus
Enzyme: 12-Lipoxygenase pH: 8 Temperature: 37 |
[3] | |
7.90E-03 ± 8.00E-04 | Human | Expression Vector: Platelets
Enzyme:12-Lipoxygenase pH: 7.4 Temperature: 37 |
[4] |
Mode (mM) | Confidence Interval | Location parameter (σ) | Scale parameter (σ) |
---|---|---|---|
7.60E-03 | 4.34E+00 | -4.48E+00 | 6.30E-01 |
Kmp
This is a “Dependent parameter”, meaning that the log-normal distribution for this parameter was calculated using multivariate distributions (this is discussed in detail here). As a result, no confidence interval factor or literature values were cited for this parameter.
Mode (mM) | Location parameter (µ) | Scale parameter (σ) |
---|---|---|
7.30E-03 | -4.52E+00 | 6.28E-01 |
kcat
Value | Units | Species | Notes | Reference |
---|---|---|---|---|
336 ± 12 | per minute | Human | Expression Vector: Human reticulocyte
Enzyme: 15-lipoxygenase-1 pH: 7.5 Temperature: 25 |
[5] |
504 | per minute | Wild Boar | Expression Vector: E. coli.
Enzyme: 12-Lipoxygenase pH: 7.4 Temperature: 37 |
[6] |
Mode (min-1) | Confidence Interval | Location parameter (µ) | Scale parameter (σ) |
---|---|---|---|
4.87E+02 | 1.20E+00 | 6.22E+00 | 1.80E-01 |
Enzyme concentration
Value | Units | Species | Notes | Reference |
---|---|---|---|---|
19.8 | Human | Expression Vector: Spleen
Enzyme: 12-LOX pH: 7.5 Temperature: 37 °C |
[7] | |
1.60 | Human | Expression Vector: Liver
Enzyme: 12-LOX pH: 7.5 Temperature: 37 °C |
[8] | |
0.28 | Human | Expression Vector: Gut
Enzyme: 12-LOX pH: 7.5 Temperature: 37 °C |
[8] | |
0.11 | Human | Expression Vector: Pancreas
Enzyme: 12-LOX pH: 7.5 Temperature: 37 °C |
[8] |
Mode (mM) | Confidence Interval | Location parameter (µ) | Scale parameter (σ) |
---|---|---|---|
4.98E-01 | 7.23E+00 | 7.12E-01 | 1.19E+00 |
Keq
Gibbs Free Energy Change | Units | Species | Notes | Reference |
---|---|---|---|---|
(-69.979996) | kcal/mol | Not stated | Estimated
Enzyme: 12-LOX Substrate: Arachidonate Product: 12-HPETE pH: 7.3 ionic strength: 0.25 |
[9] |
Mode | Confidence Interval | Location parameter (µ) | Scale parameter (σ) |
---|---|---|---|
2.27E+51 | 1.00E+01 | 1.19E+02 | 8.90E-01 |
References
- ↑ Lagarde M. "Subcellular localization and some properties of lipoxygenase activity in human blood platelets. Biochem J. 1984 Sep 1;222(2):495-500.
- ↑ Hada T. "Catalytic properties of human platelet 12-lipoxygenase as compared with the enzymes of other origins. Biochim Biophys Acta. 1991 Apr 24;1083(1):89-93.
- ↑ Chen X. S. "Purification and characterization of recombinant histidine-tagged human platelet 12-lipoxygenase expressed in a baculovirus/insect cell system. Eur J Biochem. 1993 Jun 15;214(3):845-52.
- ↑ Romano M. "Lipoxin synthase activity of human platelet 12-lipoxygenase. Biochem J. 1993 Nov 15;296 ( Pt 1):127-33.
- ↑ [www.ncbi.nlm.nih.gov/pubmed/19469483 Wecksler A. "Mechanistic Investigations of Human Reticulocyte 15- and Platelet 12-Lipoxygenases with Arachidonic Acid Biochemistry, 2009, 48 (26), pp 6259–6267]
- ↑ Richards K. "Leukocyte 12-Lipoxygenase: Expression, Purification, and Investigation of the Role of Methionine Residues in Turnover-Dependent Inactivation and 5,8,11,14-Eicosatetraynoic Acid Inhibition Biochemistry, 1997, 36 (22), pp 6692–6699
- ↑ M. Wilhelm Mass-spectrometry-based draft of the human proteome Nature, 2014 509, 582–587
- ↑ 8.0 8.1 8.2 M. Kim A draft map of the human proteome Nature, 2014 509, 575–581
- ↑ Caspi et al 2014, "The MetaCyc database of metabolic pathways and enzymes and the BioCyc collection of Pathway/Genome Databases," Nucleic Acids Research 42:D459-D471