Record Information |
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Version | 5.0 |
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Status | Detected but not Quantified |
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Creation Date | 2021-09-11 14:42:33 UTC |
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Update Date | 2021-09-26 23:09:43 UTC |
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HMDB ID | HMDB0255137 |
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Secondary Accession Numbers | None |
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Metabolite Identification |
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Common Name | N-ethylmaleimide |
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Description | N-Ethylmaleimide, also known as NEM, belongs to the class of organic compounds known as maleimides. Maleimides are compounds containing a 2,5-pyrroledione moiety. N-Ethylmaleimide (NEM) is an organic compound that is derived from maleic acid. NEM is a Michael Acceptor in Michael Reaction, which means that it adds nucleophiles such as thiols. Reaction with thiols occur in the pH range 6.5–7.5, NEM may react with amines or undergo hydrolysis at a more alkaline pH. NEM has been widely used to probe the functional role of thiol groups in enzymology. N-Ethylmaleimide is an extremely weak basic (essentially neutral) compound (based on its pKa). N-Ethylmaleimide was used by Arthur Kornberg and colleagues to knock out DNA polymerase III in order to compare its activity to that of DNA polymerase I (pol III and I, respectively). This discovery contributed to the molecular identification of K-Cl cotransport (KCC) in human embryonic cells transfected by KCC1 isoform cDNA, 16 years later. In lysis buffers, 20 to 25 mM of NEM is used to inhibit de-sumoylation of proteins for Western Blot analysis. Despite repeated unsuccessful attempts to identify chemically the target thiol group, at physiological pH, NEM may form adducts with thiols within protein kinases that phosphorylate KCC at specific serine and threonine residues primarily within the C-terminal domain of the transporter. The resulting thioether features a strong C-S bond and the reaction is virtually irreversible. This compound has been identified in human blood as reported by (PMID: 31557052 ). N-ethylmaleimide is not a naturally occurring metabolite and is only found in those individuals exposed to this compound or its derivatives. Technically N-ethylmaleimide is part of the human exposome. The exposome can be defined as the collection of all the exposures of an individual in a lifetime and how those exposures relate to health. An individual's exposure begins before birth and includes insults from environmental and occupational sources. |
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Structure | InChI=1S/C6H7NO2/c1-2-7-5(8)3-4-6(7)9/h3-4H,2H2,1H3 |
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Synonyms | Value | Source |
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Ethylmaleimide | ChEBI | NEM | ChEBI | N Ethylmaleimide | MeSH |
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Chemical Formula | C6H7NO2 |
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Average Molecular Weight | 125.1253 |
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Monoisotopic Molecular Weight | 125.047678473 |
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IUPAC Name | 1-ethyl-2,5-dihydro-1H-pyrrole-2,5-dione |
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Traditional Name | N-ethylmaleimide |
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CAS Registry Number | Not Available |
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SMILES | CCN1C(=O)C=CC1=O |
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InChI Identifier | InChI=1S/C6H7NO2/c1-2-7-5(8)3-4-6(7)9/h3-4H,2H2,1H3 |
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InChI Key | HDFGOPSGAURCEO-UHFFFAOYSA-N |
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Chemical Taxonomy |
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Description | Belongs to the class of organic compounds known as maleimides. Maleimides are compounds containing a 2,5-pyrroledione moiety. |
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Kingdom | Organic compounds |
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Super Class | Organoheterocyclic compounds |
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Class | Pyrrolidines |
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Sub Class | Pyrrolidones |
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Direct Parent | Maleimides |
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Alternative Parents | |
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Substituents | - Maleimide
- Carboxylic acid imide, n-substituted
- Carboxylic acid imide
- Dicarboximide
- Pyrroline
- Azacycle
- Carboxylic acid derivative
- Organic oxygen compound
- Organooxygen compound
- Organonitrogen compound
- Organic nitrogen compound
- Carbonyl group
- Hydrocarbon derivative
- Organic oxide
- Organopnictogen compound
- Aliphatic heteromonocyclic compound
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Molecular Framework | Aliphatic heteromonocyclic compounds |
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External Descriptors | |
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Ontology |
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Physiological effect | Not Available |
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Disposition | |
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Process | Not Available |
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Role | Not Available |
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Physical Properties |
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State | Not Available |
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Experimental Molecular Properties | Property | Value | Reference |
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Melting Point | Not Available | Not Available | Boiling Point | Not Available | Not Available | Water Solubility | Not Available | Not Available | LogP | Not Available | Not Available |
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Experimental Chromatographic Properties | Not Available |
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Predicted Molecular Properties | |
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Predicted Chromatographic Properties | Predicted Collision Cross SectionsPredicted Kovats Retention IndicesUnderivatized |
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| GC-MS SpectraSpectrum Type | Description | Splash Key | Deposition Date | Source | View |
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Experimental GC-MS | GC-MS Spectrum - N-ethylmaleimide GC-MS (Non-derivatized) | splash10-03di-0900000000-c33b88171d7a7134d8ea | 2014-06-16 | HMDB team, MONA, MassBank | View Spectrum | Experimental GC-MS | GC-MS Spectrum - N-ethylmaleimide EI-B (Non-derivatized) | splash10-004i-9100000000-48f43555ac8c500a19ef | 2017-09-12 | HMDB team, MONA, MassBank | View Spectrum | Predicted GC-MS | Predicted GC-MS Spectrum - N-ethylmaleimide GC-MS (Non-derivatized) - 70eV, Positive | splash10-004i-9400000000-99633ca04b12b829d300 | 2017-08-28 | Wishart Lab | View Spectrum | Predicted GC-MS | Predicted GC-MS Spectrum - N-ethylmaleimide GC-MS (Non-derivatized) - 70eV, Positive | Not Available | 2021-10-12 | Wishart Lab | View Spectrum |
MS/MS SpectraSpectrum Type | Description | Splash Key | Deposition Date | Source | View |
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Experimental LC-MS/MS | LC-MS/MS Spectrum - N-ethylmaleimide LC-ESI-QQ , positive-QTOF | splash10-056u-6900000000-94013ce2ca6bdcffb4df | 2017-09-14 | HMDB team, MONA | View Spectrum | Experimental LC-MS/MS | LC-MS/MS Spectrum - N-ethylmaleimide LC-ESI-QQ , positive-QTOF | splash10-0a7j-9400000000-53554a958dc4ae9f48a7 | 2017-09-14 | HMDB team, MONA | View Spectrum | Experimental LC-MS/MS | LC-MS/MS Spectrum - N-ethylmaleimide LC-ESI-QQ , positive-QTOF | splash10-0059-9000000000-fa6c358f580cb0f757de | 2017-09-14 | HMDB team, MONA | View Spectrum | Experimental LC-MS/MS | LC-MS/MS Spectrum - N-ethylmaleimide LC-ESI-QQ , positive-QTOF | splash10-014i-9000000000-e7b72b3c791bdf455d37 | 2017-09-14 | HMDB team, MONA | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - N-ethylmaleimide 10V, Positive-QTOF | splash10-004i-0900000000-9e7c4d6dbe21fdca95c9 | 2017-07-26 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - N-ethylmaleimide 20V, Positive-QTOF | splash10-004i-2900000000-c22b727a397ee7f0ab57 | 2017-07-26 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - N-ethylmaleimide 40V, Positive-QTOF | splash10-002e-9000000000-b071c87224e0fce7d627 | 2017-07-26 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - N-ethylmaleimide 10V, Negative-QTOF | splash10-00di-2900000000-190e70da550428654086 | 2017-07-26 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - N-ethylmaleimide 20V, Negative-QTOF | splash10-00dj-8900000000-19ee76e970058c21c981 | 2017-07-26 | Wishart Lab | View Spectrum | Predicted LC-MS/MS | Predicted LC-MS/MS Spectrum - N-ethylmaleimide 40V, Negative-QTOF | splash10-0f6y-9000000000-f2ff9b9872acc5187490 | 2017-07-26 | Wishart Lab | View Spectrum |
NMR SpectraSpectrum Type | Description | Deposition Date | Source | View |
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Predicted 1D NMR | 1H NMR Spectrum (1D, 100 MHz, D2O, predicted) | 2021-10-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 13C NMR Spectrum (1D, 100 MHz, D2O, predicted) | 2021-10-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 1H NMR Spectrum (1D, 1000 MHz, D2O, predicted) | 2021-10-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 13C NMR Spectrum (1D, 1000 MHz, D2O, predicted) | 2021-10-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 13C NMR Spectrum (1D, 200 MHz, D2O, predicted) | 2021-10-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 1H NMR Spectrum (1D, 200 MHz, D2O, predicted) | 2021-10-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 13C NMR Spectrum (1D, 300 MHz, D2O, predicted) | 2021-10-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 1H NMR Spectrum (1D, 300 MHz, D2O, predicted) | 2021-10-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 13C NMR Spectrum (1D, 400 MHz, D2O, predicted) | 2021-10-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 1H NMR Spectrum (1D, 400 MHz, D2O, predicted) | 2021-10-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 13C NMR Spectrum (1D, 500 MHz, D2O, predicted) | 2021-10-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 1H NMR Spectrum (1D, 500 MHz, D2O, predicted) | 2021-10-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 13C NMR Spectrum (1D, 600 MHz, D2O, predicted) | 2021-10-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 1H NMR Spectrum (1D, 600 MHz, D2O, predicted) | 2021-10-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 13C NMR Spectrum (1D, 700 MHz, D2O, predicted) | 2021-10-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 1H NMR Spectrum (1D, 700 MHz, D2O, predicted) | 2021-10-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 13C NMR Spectrum (1D, 800 MHz, D2O, predicted) | 2021-10-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 1H NMR Spectrum (1D, 800 MHz, D2O, predicted) | 2021-10-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 13C NMR Spectrum (1D, 900 MHz, D2O, predicted) | 2021-10-25 | Wishart Lab | View Spectrum | Predicted 1D NMR | 1H NMR Spectrum (1D, 900 MHz, D2O, predicted) | 2021-10-25 | Wishart Lab | View Spectrum |
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