Difference between revisions of "Transformation of 5-HETE to 5-OXO-ETE"
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=== Enzyme concentration (Using ADH5 abundance data) === | === Enzyme concentration (Using ADH5 abundance data) === | ||
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+ | To convert the enzyme concentration from ppm to mM, the following [[Common equations#Enzyme concentration (mM)|equation]] was used. | ||
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{|class="wikitable" | {|class="wikitable" | ||
|+ style="text-align: left;" | Literature values | |+ style="text-align: left;" | Literature values | ||
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{| class="wikitable" | {| class="wikitable" | ||
|+ style="text-align: left;" | Description of the 5-HEDH concentration distribution | |+ style="text-align: left;" | Description of the 5-HEDH concentration distribution | ||
− | ! Mode (mM) !! Confidence Interval !! Location parameter (µ) !! Scale parameter (σ) | + | ! Mode (ppm) !! Mode (mM) !! Confidence Interval !! Location parameter (µ) !! Scale parameter (σ) |
|- | |- | ||
− | | 4.88E+02 || 6.37E+00 || 7.49E+00 || 1.14E+00 | + | | 4.88E+02 || 2.70E-03|| 6.37E+00 || 7.49E+00 || 1.14E+00 |
|} | |} | ||
[[Image:155.jpg|none|thumb|500px|The estimated probability distribution for 5-HEDH concentration. The value and weight of the literature values used to define the distribution are indicated by an orange dashed line. The x axis is plotted on a log-scale. ]] | [[Image:155.jpg|none|thumb|500px|The estimated probability distribution for 5-HEDH concentration. The value and weight of the literature values used to define the distribution are indicated by an orange dashed line. The x axis is plotted on a log-scale. ]] | ||
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===K<sub>eq</sub>=== | ===K<sub>eq</sub>=== |
Revision as of 10:42, 30 May 2019
The metabolism of 5-HETE to 5-Oxo-ETE is catalysed by the enzyme 5-Hydroxyeicosanoid dehydrogenase (5-HEDH). This enzyme acts reversibly and has been reported to be found in eosinophils, monocytes, DC, B-lymphocytes, keratinocytes and platelets (Steinhilber book) *skin (need to check). The product binds with the OXE receptor (Hosoi2002) and is 30-100 more bioactive than 5-HETE. 5-Oxo-ETE is a chemoattractant for neutrophils and eosinophils.
Contents
Reaction
Chemical equation
Rate equation
Parameters
Note that there was limited availability of kinetic data for this specific enzyme, therefore parameters for general alcohol dehydrogenase (ADH) was used when non were available.
Kms
Value | Units | Species | Notes | Weight | Reference |
---|---|---|---|---|---|
0.0006 | mM | Unkown | Follows a ping-pong mechanism by binding with NADP+, transforming it to NADPH and releasing it before binding 5S-HETE. | 64 | [1] |
0.00067 | mM | Human Cell lines | Follows a ping-pong mechanism by binding with NADP+ (Km 139 nM), transforming it to NADPH (inhibited by NADPH (Ki 224 nM)) and releasing it before binding 5S-HETE.
Method: In vitro Organism: Human Expression vector: U937 and HL-60 cell lines Enzyme:5-HEDH pH: 7.4 Temperature: 37 ◦C |
2048 | [2] |
0.000516 ± 0.00019 | mM | Human Cell lines |
Method: In vitro Organism: Human Expression vector: U937 Enzyme:5-HEDH pH: 7.4 Temperature: 37 ◦C |
2048 | [3] |
Mode (mM) | Confidence Interval | Location parameter (µ) | Scale parameter (σ) |
---|---|---|---|
6.34E-04 | 1.63E+01 | -6.31E+00 | 1.03E+00 |
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) |
---|---|---|
1.14E+04 | 1.09E+01 | 1.25E+00 |
Vmax
Value | Units | Species | Notes | Reference |
---|---|---|---|---|
0.54 ± 0.30 | pmol/ mi mg | Human Cell lines - Neutrophils |
Method: In vitro Organism: Human Expression vector: U937 and HL-60 cell lines Enzyme:5-HEDH pH: 7.4 Temperature: 37 ◦C |
[2] |
0.40 ± 0.12 | pmol/ mi mg | Human Cell lines - U937 |
Method: In vitro Organism: Human Expression vector: U937 and HL-60 cell lines Enzyme:5-HEDH pH: 7.4 Temperature: 37 ◦C |
[2] |
kcat
Value | Units | Species | Notes | Weight | Reference |
---|---|---|---|---|---|
11640 ± 840 | min-1 | Yokenella | Method: In vitro
Organism: Human Expression vector: E Coli Enzyme: pH: 6.5 Temperature: 65 ◦C Substrate: NADPH |
128 | [4] |
Mode (min-1) | Confidence Interval | Location parameter (µ) | Scale parameter (σ) |
---|---|---|---|
1.15E+04 | 4.02E+01 | 1.09E+01 | 1.25E+00 |
Enzyme concentration (Using ADH5 abundance data)
To convert the enzyme concentration from ppm to mM, the following equation was used.
Value | Units | Species | Notes | Weight | Reference |
---|---|---|---|---|---|
490 | ppm | Human | Expression Vector: Skin
Enzyme: ADH5 pH: 7.5 Temperature: 37 °C |
2048 | [5] |
625 | ppm | Human | Expression Vector: Oral Cavity
Enzyme: ADH5 pH: 7.5 Temperature: 37 °C |
1024 | [5] |
728 | ppm | Human | Expression Vector: Esophagus
Enzyme: ADH5 pH: 7.5 Temperature: 37 °C |
1024 | [6] |
11.5 | ppm | Human | Expression Vector: Skin
Enzyme: ADH5 pH: Unknown Temperature: Unknown |
2048 | [6] |
Mode (ppm) | Mode (mM) | Confidence Interval | Location parameter (µ) | Scale parameter (σ) |
---|---|---|---|---|
4.88E+02 | 2.70E-03 | 6.37E+00 | 7.49E+00 | 1.14E+00 |
Keq
Gibbs Free energy | Units | Species | Notes | Weight | Reference |
---|---|---|---|---|---|
1.29 | kcal/mol | Arabidopsis thaliana col | Same reaction, no prediction available for 5-HEDH on Metacyc
Estimated Enzyme: ω-hydroxy fatty acid ω-alcohol dehydrogenase Substrate: 18-hydroxyoleate Product: 18-oxo-oleate pH: 7.3 ionic strength: 0.25 |
64 | [7] |
Mode | Confidence Interval | Location parameter (µ) | Scale parameter (σ) |
---|---|---|---|
1.12E-01 | 1.00E+01 | -1.39E+00 | 8.91E-01 |
Related Reactions
References
- ↑ Lipoxygenases in Inflammation - edited by Dieter Steinhilber
- ↑ 2.0 2.1 2.2 [https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1828885/pdf/bj4030157.pdf Karl-Rudolf ERLEMANN, Regulation of 5-hydroxyeicosanoid dehydrogenase activity in monocytic cells, Biochem. J. (2007) 403, 157–165]
- ↑ [http://jpet.aspetjournals.org/content/jpet/329/1/335.full.pdf Karl-Pranav Patel, Selectivity of 5-Hydroxyeicosanoid Dehydrogenase and Its Inhibition by 5-Hydroxy-Long-Chain Fatty Acids, Journal of Pharmacology and Experimental Therapeutics April 2009, 329 (1) 335-341; ]
- ↑ Cong Wei, The Role of 15-Lipoxygenase-1- and Cyclooxygenase-2-Derived Lipid Mediators in Endothelial Cell Proliferation, Thesis (2010)
- ↑ 5.0 5.1 [http://www.nature.com/nature/journal/v509/n7502/pdf/nature13319.pdf M. Wilhelm Mass-spectrometry-based draft of the human proteome Nature, 2014 509, 582–587]
- ↑ 6.0 6.1 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