Difference between revisions of "Transformation of AA to 15-HPETE"
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[[Welcome to the In-Silico Model of Cutaneous Lipids Wiki | Return to overview]] | [[Welcome to the In-Silico Model of Cutaneous Lipids Wiki | Return to overview]] | ||
+ | |||
+ | The genes ALOX15B and ALOX15 encodes the formation of two isoforms of 15-lioxygenase (15-LOX). The gene ALOX15B encodes the formation of 15-LOX-2, which converts AA exclusively into 15(S)-HPETE. Whereas the gene ALOX15 encodes the 15-LOX-1 protein, which converts AA into both 12(S)-HPETE and 15(S)-HPETE. The formation of the unstable hydroperoxy fatty acids (HPETE) begins with the abstraction of a hydrogen radical at the allylic position between two double bonds. The structure undergoes a rearrangement reaction which results in the formation of a conjugated diene system. The insertion of molecular oxygen and a hydrogen leads to the formation of the final structure, a hydroperoxy fatty acid. | ||
== Reaction == | == Reaction == | ||
Line 6: | Line 8: | ||
==Chemical equation== | ==Chemical equation== | ||
− | <center><math> AA \rightleftharpoons | + | <center><math> AA \rightleftharpoons 15-HPETE </math></center> |
== Rate equation == | == Rate equation == | ||
+ | [[File:R17.PNG|center|500px]] | ||
== 15-LOX Parameters == | == 15-LOX Parameters == | ||
− | + | ===K<sub>ms</sub>=== | |
{|class="wikitable sortable" | {|class="wikitable sortable" | ||
− | |+ style="text-align: left;" | | + | |+ style="text-align: left;" | Literature values |
|- | |- | ||
! Value | ! Value | ||
Line 20: | Line 23: | ||
! Species | ! Species | ||
! Notes | ! Notes | ||
+ | ! Weight | ||
! Reference | ! Reference | ||
|- | |- | ||
Line 29: | Line 33: | ||
pH: 7.5 | pH: 7.5 | ||
Temperature: 25 | Temperature: 25 | ||
+ | |512 | ||
|<ref name="Jacquot2008"> [http://www.ncbi.nlm.nih.gov/pubmed/18547056 Jacquot C. "Isotope sensitive branching and kinetic isotope effects in the reaction of deuterated arachidonic acids with human 12- and 15-lipoxygenases.'' Biochemistry. 2008 Jul 8;47(27):7295-303. doi: 10.1021/bi800308q. Epub 2008 Jun 12.]</ref> | |<ref name="Jacquot2008"> [http://www.ncbi.nlm.nih.gov/pubmed/18547056 Jacquot C. "Isotope sensitive branching and kinetic isotope effects in the reaction of deuterated arachidonic acids with human 12- and 15-lipoxygenases.'' Biochemistry. 2008 Jul 8;47(27):7295-303. doi: 10.1021/bi800308q. Epub 2008 Jun 12.]</ref> | ||
|- | |- | ||
Line 38: | Line 43: | ||
pH:7.5 | pH:7.5 | ||
Temperature: Unspecified | Temperature: Unspecified | ||
+ | |512 | ||
|<ref name="Jacquot2008b"> [http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2883171/ Jacquot C. "Synthesis of 11-Thialinoleic Acid and 14-Thialinoleic Acid, Inhibitors of Soybean and Human Lipoxygenases'' Org Biomol Chem. 2008 Nov 21; 6(22): 4242–4252.]</ref> | |<ref name="Jacquot2008b"> [http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2883171/ Jacquot C. "Synthesis of 11-Thialinoleic Acid and 14-Thialinoleic Acid, Inhibitors of Soybean and Human Lipoxygenases'' Org Biomol Chem. 2008 Nov 21; 6(22): 4242–4252.]</ref> | ||
|- | |- | ||
Line 47: | Line 53: | ||
pH: 6.7 - 7.3 | pH: 6.7 - 7.3 | ||
Temperature: 37 | Temperature: 37 | ||
+ | |2048 | ||
|<ref name="Burrall1988"> [http://www.ncbi.nlm.nih.gov/pubmed/2459258 Burrall B. "Enzymatic properties of the 15-lipoxygenase of human cultured keratinocytes.'' J Invest Dermatol. 1988 Oct;91(4):294-7.]</ref> | |<ref name="Burrall1988"> [http://www.ncbi.nlm.nih.gov/pubmed/2459258 Burrall B. "Enzymatic properties of the 15-lipoxygenase of human cultured keratinocytes.'' J Invest Dermatol. 1988 Oct;91(4):294-7.]</ref> | ||
|- | |- | ||
Line 56: | Line 63: | ||
pH: 6.8 | pH: 6.8 | ||
Temperature: 37 | Temperature: 37 | ||
+ | |512 | ||
|<ref name="Sloane1995"> [http://www.ncbi.nlm.nih.gov/pubmed/7479689 Sloane D. L. "Conversion of human 15-lipoxygenase to an efficient 12-lipoxygenase: the side-chain geometry of amino acids 417 and 418 determine positional specificity.'' Protein Eng. 1995 Mar;8(3):275-82..]</ref> | |<ref name="Sloane1995"> [http://www.ncbi.nlm.nih.gov/pubmed/7479689 Sloane D. L. "Conversion of human 15-lipoxygenase to an efficient 12-lipoxygenase: the side-chain geometry of amino acids 417 and 418 determine positional specificity.'' Protein Eng. 1995 Mar;8(3):275-82..]</ref> | ||
|- | |- | ||
|} | |} | ||
+ | {| class="wikitable" | ||
+ | |+ style="text-align: left;" | Description of the 15-LOX Kms distribution | ||
+ | ! Mode (mM) !! Confidence Interval !! Location parameter (µ) !! Scale parameter (σ) | ||
+ | |- | ||
+ | | 1.02E-02 || 2.40E+00 || -4.42E+00 || 4.10E-01 | ||
+ | |- | ||
+ | |} | ||
+ | |||
+ | [[Image:57.jpg|none|thumb|500px|The estimated probability distribution for 15-LOX Kms. 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. ]] | ||
+ | |||
+ | |||
+ | ===K<sub>mp</sub>=== | ||
+ | {| class="wikitable" | ||
+ | |+ style="text-align: left;" | Description of the 15-LOX Kmp distribution | ||
+ | ! Mode (mM) !! Location parameter (µ) !! Scale parameter (σ) | ||
+ | |- | ||
+ | | 1.02E-02 || -4.42E+00 || 4.11E-01 | ||
+ | |} | ||
+ | |||
+ | [[Image:58.jpg|none|thumb|500px|The estimated probability distribution for 15-LOX Kmp. 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. ]] | ||
+ | |||
+ | ===k<sub>cat</sub>=== | ||
{|class="wikitable sortable" | {|class="wikitable sortable" | ||
− | |+ style="text-align: left;" | | + | |+ style="text-align: left;" | Literature values |
|- | |- | ||
! Value | ! Value | ||
Line 67: | Line 97: | ||
! Species | ! Species | ||
! Notes | ! Notes | ||
+ | ! Weight | ||
! Reference | ! Reference | ||
|- | |- | ||
Line 76: | Line 107: | ||
pH: 7.5 | pH: 7.5 | ||
Temperature: 25 | Temperature: 25 | ||
+ | |512 | ||
|<ref name="Jacquot2008"> [http://www.ncbi.nlm.nih.gov/pubmed/18547056 Jacquot C. "Isotope sensitive branching and kinetic isotope effects in the reaction of deuterated arachidonic acids with human 12- and 15-lipoxygenases.'' Biochemistry. 2008 Jul 8;47(27):7295-303. doi: 10.1021/bi800308q. Epub 2008 Jun 12.]</ref> | |<ref name="Jacquot2008"> [http://www.ncbi.nlm.nih.gov/pubmed/18547056 Jacquot C. "Isotope sensitive branching and kinetic isotope effects in the reaction of deuterated arachidonic acids with human 12- and 15-lipoxygenases.'' Biochemistry. 2008 Jul 8;47(27):7295-303. doi: 10.1021/bi800308q. Epub 2008 Jun 12.]</ref> | ||
|- | |- | ||
Line 83: | Line 115: | ||
Enzyme:15-lipoxygenase-2 | Enzyme:15-lipoxygenase-2 | ||
|pH 7, Temperature: 22 | |pH 7, Temperature: 22 | ||
+ | |rowspan="7"|512 | ||
|rowspan="7"|<ref name="Wecksler2009"> [http://www.ncbi.nlm.nih.gov/pubmed/18547056 Wecksler A. "Kinetic and Structural Investigations of the Allosteric Site in Human Epithelial 15-Lipoxygenase-2'' Biochemistry, 2009, 48 (36), pp 8721–8730]</ref> | |rowspan="7"|<ref name="Wecksler2009"> [http://www.ncbi.nlm.nih.gov/pubmed/18547056 Wecksler A. "Kinetic and Structural Investigations of the Allosteric Site in Human Epithelial 15-Lipoxygenase-2'' Biochemistry, 2009, 48 (36), pp 8721–8730]</ref> | ||
|- | |- | ||
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|- | |- | ||
|} | |} | ||
+ | |||
+ | {| class="wikitable" | ||
+ | |+ style="text-align: left;" | Description of the 15-LOX kcat distribution | ||
+ | ! Mode (min-1) !! Confidence Interval !! Location parameter (µ) !! Scale parameter (σ) | ||
+ | |- | ||
+ | | 6.51E+01 || 4.62E+00 || 4.60E+00 || 6.50E-01 | ||
+ | |} | ||
+ | |||
+ | [[Image:59.jpg|none|thumb|500px|The estimated probability distribution for 15-LOX kcat. 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. ]] | ||
+ | |||
+ | ===Enzyme concentration === | ||
+ | |||
+ | To convert the enzyme concentration from ppm to mM, the following [[Common equations#Enzyme concentration (mM)|equation]] was used. | ||
{|class="wikitable sortable" | {|class="wikitable sortable" | ||
− | |+ style="text-align: left;" | | + | |+ style="text-align: left;" | Literature values |
|- | |- | ||
! Value | ! Value | ||
Line 112: | Line 158: | ||
! Species | ! Species | ||
! Notes | ! Notes | ||
+ | ! Weight | ||
! Reference | ! Reference | ||
|- | |- | ||
− | | | + | |4.09 |
− | | | + | |<math> ppm </math> |
− | |Human | + | |Human |
− | | | + | |Expression Vector: Lung |
− | + | Enzyme: 15-LOX | |
− | |<ref name=" | + | pH: 7.5 |
+ | Temperature: 37 °C | ||
+ | |1024 | ||
+ | |<ref name="Kim2014"> [http://www.nature.com/nature/journal/v509/n7502/pdf/nature13302.pdf M. Kim ''A draft map of the human proteome'' Nature, 2014 509, 575–581]</ref> | ||
+ | |- | ||
+ | |37.4 | ||
+ | |<math> ppm </math> | ||
+ | |Human | ||
+ | |Expression Vector: Spleen | ||
+ | Enzyme: 15-LOX | ||
+ | pH: 7.5 | ||
+ | Temperature: 37 °C | ||
+ | |1024 | ||
+ | |<ref name="Wilhelm2014"> [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]</ref> | ||
|- | |- | ||
− | | | + | |1.40 |
− | | | + | |<math> ppm </math> |
|Human | |Human | ||
− | | | + | |Expression Vector: Gut |
− | |<ref name=" | + | Enzyme: 12-LOX |
+ | pH: 7.5 | ||
+ | Temperature: 37 °C | ||
+ | |1024 | ||
+ | |<ref name="Kim2014"> [http://www.nature.com/nature/journal/v509/n7502/pdf/nature13302.pdf M. Kim ''A draft map of the human proteome'' Nature, 2014 509, 575–581]</ref> | ||
+ | |- | ||
|} | |} | ||
+ | |||
+ | {| class="wikitable" | ||
+ | |+ style="text-align: left;" | Description of the 15-LOX concentration distribution | ||
+ | ! Mode (ppm) !! Mode (mM) !! Confidence Interval !! Location parameter (µ) !! Scale parameter (σ) | ||
+ | |- | ||
+ | | 4.07 || 2.25E-05|| 7.23E+00 || 7.12E-01 || 1.19E+00 | ||
+ | |} | ||
+ | |||
+ | [[Image:157.jpg|none|thumb|500px|The estimated probability distribution for 15-LOX 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. ]] | ||
+ | |||
+ | ===K<sub>eq</sub>=== | ||
+ | {|class="wikitable sortable" | ||
+ | |+ style="text-align: left;" | Literature values | ||
+ | |- | ||
+ | ! Gibbs Free Energy Change | ||
+ | ! Units | ||
+ | ! Species | ||
+ | ! Notes | ||
+ | ! Weight | ||
+ | ! Reference | ||
+ | |- | ||
+ | |(-69.979996) | ||
+ | |kcal/mol | ||
+ | |Not stated | ||
+ | |Estimated | ||
+ | Enzyme: 15-LOX | ||
+ | Substrate: Arachidonate | ||
+ | Product: 15-HPETE | ||
+ | pH: 7.3 | ||
+ | ionic strength: 0.25 | ||
+ | |64 | ||
+ | |<ref name="MetaCyc”>[http://metacyc.org/META/NEW-IMAGE?type=REACTION&object=RXN66-490 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]</ref> | ||
+ | |} | ||
+ | |||
+ | {| class="wikitable" | ||
+ | |+ style="text-align: left;" | Description of the 15-LOX Keq distribution | ||
+ | ! Mode !! Confidence Interval !! Location parameter (µ) !! Scale parameter (σ) | ||
+ | |- | ||
+ | | 2.27E+51 || 1.00E+01 || 1.19E+02 || 8.90E-01 | ||
+ | |} | ||
+ | |||
+ | [[Image:60.jpg|none|thumb|500px|The estimated probability distribution for 15-LOX Keq. 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. ]] | ||
== References == | == References == |
Latest revision as of 08:19, 21 August 2019
The genes ALOX15B and ALOX15 encodes the formation of two isoforms of 15-lioxygenase (15-LOX). The gene ALOX15B encodes the formation of 15-LOX-2, which converts AA exclusively into 15(S)-HPETE. Whereas the gene ALOX15 encodes the 15-LOX-1 protein, which converts AA into both 12(S)-HPETE and 15(S)-HPETE. The formation of the unstable hydroperoxy fatty acids (HPETE) begins with the abstraction of a hydrogen radical at the allylic position between two double bonds. The structure undergoes a rearrangement reaction which results in the formation of a conjugated diene system. The insertion of molecular oxygen and a hydrogen leads to the formation of the final structure, a hydroperoxy fatty acid.
Contents
Reaction
Chemical equation
Rate equation
15-LOX Parameters
Kms
Value | Units | Species | Notes | Weight | Reference |
---|---|---|---|---|---|
3.70E-03 ± 3.00E-04 | Human | Expression Vector: Epithelium
Enzyme: 15-Lipoxygenase pH: 7.5 Temperature: 25 |
512 | [1] | |
5.00E-03 | Human | Expression Vector: Reticulocyte
Enzyme: 15-Lipoxygenase pH:7.5 Temperature: Unspecified |
512 | [2] | |
1.06E-02 | Human | Expression Vector: Keratinocyte
Enzyme: 15-Lipoxygenase pH: 6.7 - 7.3 Temperature: 37 |
2048 | [3] | |
1.17E-02 ± 9.00E-04 | Human | Expression Vector: Baculovirus Insect Cell
Enzyme: Wildtype 15-Lipoxygenase pH: 6.8 Temperature: 37 |
512 | [4] |
Mode (mM) | Confidence Interval | Location parameter (µ) | Scale parameter (σ) |
---|---|---|---|
1.02E-02 | 2.40E+00 | -4.42E+00 | 4.10E-01 |
Kmp
Mode (mM) | Location parameter (µ) | Scale parameter (σ) |
---|---|---|
1.02E-02 | -4.42E+00 | 4.11E-01 |
kcat
Value | Units | Species | Notes | Weight | Reference |
---|---|---|---|---|---|
595.8 ± 16.8 | Human | Expression Vector: Epithelium
Enzyme: 15-Lipoxygenase pH: 7.5 Temperature: 25 |
512 | [1] | |
37.2 ± 1.8 | per minute | Expression Vector:Human prostate epithelial
Enzyme:15-lipoxygenase-2 |
pH 7, Temperature: 22 | 512 | [5] |
45 ± 1.2 | pH 7.5, Temperature: 22 | ||||
44.4 ± 2.4 | pH 8, Temperature: 22 | ||||
34.2 ± 0.6 | 15°C, pH = 7.5 | ||||
45 ± 1.2 | 22°C, pH = 7.5 | ||||
62.4 ± 4.2 | 30°C, pH = 7.5 | ||||
82.8 ± 4.8 | 37°C, pH = 7.5 |
Mode (min-1) | Confidence Interval | Location parameter (µ) | Scale parameter (σ) |
---|---|---|---|
6.51E+01 | 4.62E+00 | 4.60E+00 | 6.50E-01 |
Enzyme concentration
To convert the enzyme concentration from ppm to mM, the following equation was used.
Value | Units | Species | Notes | Weight | Reference |
---|---|---|---|---|---|
4.09 | Human | Expression Vector: Lung
Enzyme: 15-LOX pH: 7.5 Temperature: 37 °C |
1024 | [6] | |
37.4 | Human | Expression Vector: Spleen
Enzyme: 15-LOX pH: 7.5 Temperature: 37 °C |
1024 | [7] | |
1.40 | Human | Expression Vector: Gut
Enzyme: 12-LOX pH: 7.5 Temperature: 37 °C |
1024 | [6] |
Mode (ppm) | Mode (mM) | Confidence Interval | Location parameter (µ) | Scale parameter (σ) |
---|---|---|---|---|
4.07 | 2.25E-05 | 7.23E+00 | 7.12E-01 | 1.19E+00 |
Keq
Gibbs Free Energy Change | Units | Species | Notes | Weight | Reference |
---|---|---|---|---|---|
(-69.979996) | kcal/mol | Not stated | Estimated
Enzyme: 15-LOX Substrate: Arachidonate Product: 15-HPETE pH: 7.3 ionic strength: 0.25 |
64 | [8] |
Mode | Confidence Interval | Location parameter (µ) | Scale parameter (σ) |
---|---|---|---|
2.27E+51 | 1.00E+01 | 1.19E+02 | 8.90E-01 |
References
- ↑ 1.0 1.1 Jacquot C. "Isotope sensitive branching and kinetic isotope effects in the reaction of deuterated arachidonic acids with human 12- and 15-lipoxygenases. Biochemistry. 2008 Jul 8;47(27):7295-303. doi: 10.1021/bi800308q. Epub 2008 Jun 12.
- ↑ Jacquot C. "Synthesis of 11-Thialinoleic Acid and 14-Thialinoleic Acid, Inhibitors of Soybean and Human Lipoxygenases Org Biomol Chem. 2008 Nov 21; 6(22): 4242–4252.
- ↑ Burrall B. "Enzymatic properties of the 15-lipoxygenase of human cultured keratinocytes. J Invest Dermatol. 1988 Oct;91(4):294-7.
- ↑ Sloane D. L. "Conversion of human 15-lipoxygenase to an efficient 12-lipoxygenase: the side-chain geometry of amino acids 417 and 418 determine positional specificity. Protein Eng. 1995 Mar;8(3):275-82..
- ↑ Wecksler A. "Kinetic and Structural Investigations of the Allosteric Site in Human Epithelial 15-Lipoxygenase-2 Biochemistry, 2009, 48 (36), pp 8721–8730
- ↑ 6.0 6.1 M. Kim A draft map of the human proteome Nature, 2014 509, 575–581
- ↑ M. Wilhelm Mass-spectrometry-based draft of the human proteome Nature, 2014 509, 582–587
- ↑ 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