Target type: biologicalprocess
The nonsense-mediated decay pathway for nuclear-transcribed mRNAs degrades mRNAs in which an amino-acid codon has changed to a nonsense codon; this prevents the translation of such mRNAs into truncated, and potentially harmful, proteins. [GOC:krc, GOC:ma, PMID:10025395]
Nonsense-mediated decay (NMD) is a crucial surveillance pathway that eliminates mRNAs containing premature termination codons (PTCs) from the cytoplasm, preventing the synthesis of truncated and potentially harmful proteins. This process plays a critical role in maintaining the integrity of the proteome and ensuring proper gene expression.
NMD is initiated during the translation of an mRNA molecule. When a ribosome encounters a PTC upstream of a downstream exon junction complex (EJC), a complex of proteins typically deposited at exon-exon junctions during splicing, it triggers a cascade of events leading to mRNA degradation.
The key players in NMD include:
* **Upf1:** A central factor that binds to the EJC and interacts with the ribosome.
* **Upf2:** An RNA helicase that unwinds the mRNA in the 3' direction.
* **Upf3:** A protein that interacts with Upf1 and Upf2 and promotes mRNA decay.
The mechanism of NMD involves the following steps:
1. **Ribosome encounters a PTC:** As the ribosome translates the mRNA, it encounters a PTC located upstream of an EJC.
2. **EJC recognition by Upf1:** Upf1, a protein that interacts with the EJC, recognizes the EJC downstream of the PTC.
3. **Upf2 recruitment:** Upf2, an RNA helicase, is recruited to the complex and unwinds the mRNA in the 3' direction.
4. **Upf3 interaction:** Upf3 binds to Upf1 and Upf2, forming a complex that promotes mRNA degradation.
5. **Decapping and degradation:** The mRNA is decapped (removal of the 5' cap), making it susceptible to degradation by exonucleases.
NMD is a highly regulated process that can be influenced by several factors:
* **Distance between the PTC and the EJC:** The efficiency of NMD is influenced by the distance between the PTC and the downstream EJC.
* **Strength of the PTC:** The strength of the PTC, or how efficiently it terminates translation, also affects NMD efficiency.
* **Cellular conditions:** NMD can be regulated by cellular conditions, such as stress and nutrient availability.
NMD plays a vital role in maintaining cellular homeostasis by eliminating aberrant mRNAs that could lead to the production of truncated or misfolded proteins. It also contributes to the regulation of gene expression by fine-tuning the levels of specific proteins.
Defects in NMD can have detrimental effects on cellular function, leading to various diseases, including cancer and neurological disorders. Understanding the intricacies of NMD is crucial for developing therapeutic strategies to address these conditions.'
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| Protein | Definition | Taxonomy |
|---|---|---|
| Serine/threonine-protein kinase SMG1 | A serine/threonine-protein kinase SMG1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q96Q15] | Homo sapiens (human) |
| Serine/threonine-protein kinase SMG1 | A serine/threonine-protein kinase SMG1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q96Q15] | Homo sapiens (human) |
| Eukaryotic peptide chain release factor GTP-binding subunit ERF3B | A eukaryotic peptide chain release factor GTP-binding subunit ERF3B that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q8IYD1] | Homo sapiens (human) |
| Eukaryotic initiation factor 4A-III | A eukaryotic initiation factor 4A-III that is encoded in the genome of human. [PRO:DNx, UniProtKB:P38919] | Homo sapiens (human) |
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| fasudil | fasudil : An isoquinoline substituted by a (1,4-diazepan-1-yl)sulfonyl group at position 5. It is a Rho-kinase inhibitor and its hydrochloride hydrate form is approved for the treatment of cerebral vasospasm and cerebral ischemia. fasudil: intracellular calcium antagonist; structure in first source | isoquinolines; N-sulfonyldiazepane | antihypertensive agent; calcium channel blocker; EC 2.7.11.1 (non-specific serine/threonine protein kinase) inhibitor; geroprotector; neuroprotective agent; nootropic agent; vasodilator agent |
| imatinib | aromatic amine; benzamides; N-methylpiperazine; pyridines; pyrimidines | antineoplastic agent; apoptosis inducer; tyrosine kinase inhibitor | |
| gefitinib | aromatic ether; monochlorobenzenes; monofluorobenzenes; morpholines; quinazolines; secondary amino compound; tertiary amino compound | antineoplastic agent; epidermal growth factor receptor antagonist | |
| canertinib | monochlorobenzenes; morpholines; organofluorine compound; quinazolines | antineoplastic agent; tyrosine kinase inhibitor | |
| lapatinib | furans; organochlorine compound; organofluorine compound; quinazolines | antineoplastic agent; tyrosine kinase inhibitor | |
| cgp 60474 | substituted aniline | ||
| dasatinib | dasatinib (anhydrous) : An aminopyrimidine that is 2-methylpyrimidine which is substituted at position 4 by the primary amino group of 2-amino-1,3-thiazole-5-carboxylic acid and at position 6 by a 4-(2-hydroxyethyl)piperazin-1-yl group, and in which the carboxylic acid group has been formally condensed with 2-chloro-6-methylaniline to afford the corresponding amide. A multi-targeted kinase inhibitor, it is used, particularly as the monohydrate, for the treatment of chronic, accelerated, or myeloid or lymphoid blast phase chronic myeloid leukemia. Note that the name 'dasatinib' is used to refer to the monohydrate (USAN) as well as to anhydrous dasatinib (INN). N-(2-chloro-6-methylphenyl)-2-((6-(4-(2-hydroxyethyl)piperazin-1-yl)-2-methylpyrimidin-4-yl)amino)-1,3-thiazole-5-carboxamide: a dasatinib prodrug; structure in first source | 1,3-thiazoles; aminopyrimidine; monocarboxylic acid amide; N-(2-hydroxyethyl)piperazine; N-arylpiperazine; organochlorine compound; secondary amino compound; tertiary amino compound | anticoronaviral agent; antineoplastic agent; tyrosine kinase inhibitor |
| ha 1100 | HA 1100: intracellular calcium antagonist | ||
| vx680 | N-arylpiperazine | ||
| everolimus | cyclic acetal; cyclic ketone; ether; macrolide lactam; primary alcohol; secondary alcohol | anticoronaviral agent; antineoplastic agent; geroprotector; immunosuppressive agent; mTOR inhibitor | |
| axitinib | aryl sulfide; benzamides; indazoles; pyridines | antineoplastic agent; tyrosine kinase inhibitor; vascular endothelial growth factor receptor antagonist | |
| temsirolimus | macrolide lactam | ||
| ripasudil | isoquinolines | ||
| hippuristanol | hippuristanol: from the gorgonian Isis hippuris | ||
| ly-2157299 | LY-2157299 : A pyrrolopyrazole that is 5,6-dihydro-4H-pyrrolo[1,2-b]pyrazole which is substituted at positions 2 and 3 by 6-methylpyridin-2-yl and 6-(aminocarbonyl)quinolin-4-yl groups, respectively. A Transforming growth factor-betaRI (TGF-betaRI) kinase inhibitor, it blocks TGF-beta-mediated tumor growth in glioblastoma. LY-2157299: an orally active transforming growth factor beta receptor (TGF-beraR) kinase inhibitor | aromatic amide; methylpyridines; monocarboxylic acid amide; pyrrolopyrazole; quinolines | antineoplastic agent; TGFbeta receptor antagonist |
| su 14813 | 5-((5-fluoro-2-oxo-1,2-dihydro-3H-indol-3-ylidene)methyl)-N-(2-hydroxy-3-morpholin-4-ylpropyl)-2,4-dimethyl-1H-pyrrole-3-carboxamide: has both antineoplastic and antiangiogenic activities; structure in first source | ||
| bibw 2992 | aromatic ether; enamide; furans; monochlorobenzenes; organofluorine compound; quinazolines; secondary carboxamide; tertiary amino compound | antineoplastic agent; tyrosine kinase inhibitor | |
| crenolanib | aminopiperidine; aromatic ether; benzimidazoles; oxetanes; quinolines; tertiary amino compound | angiogenesis inhibitor; antineoplastic agent; apoptosis inducer; EC 2.7.10.1 (receptor protein-tyrosine kinase) inhibitor | |
| np 031112 | tideglusib : A member of the class of thiadiazolidines that is 1,2,4-thiadiazolidine-3,5-dione which is substituted by a naphthalen-1-yl group at position 2 and by a benzyl group at position 4. It is a non-ATP competitive inhibitor of glycogen synthase kinase 3beta (GSK3beta) and has neuroprotective effects. Currently under clinical investigation for the treatment of Alzheimer's disease and progressive supranuclear palsy. tideglusib: an NSAID and neuroprotective agent | benzenes; naphthalenes; thiadiazolidine | anti-inflammatory agent; apoptosis inducer; EC 2.7.11.26 (tau-protein kinase) inhibitor; neuroprotective agent |
| inno-406 | biaryl | ||
| ridaforolimus | macrolide lactam | ||
| motesanib | pyridinecarboxamide | ||
| trametinib | acetamides; aromatic amine; cyclopropanes; organofluorine compound; organoiodine compound; pyridopyrimidine; ring assembly | anticoronaviral agent; antineoplastic agent; EC 2.7.11.24 (mitogen-activated protein kinase) inhibitor; geroprotector | |
| ly2603618 | ureas | ||
| dactolisib | dactolisib : An imidazoquinoline that is 3-methyl-2-oxo-2,3-dihydro-1H-imidazo[4,5-c]quinoline substituted at position 1 by a 4-(1-cyanoisopropyl)phenyl group and at position 8 by a quinolin-3-yl group. A dual PI3K/mTOR inhibitor used in cancer treatment. dactolisib: antineoplastic agent that inhibits both phosphatidylinositol 3-kinase and mTOR | imidazoquinoline; nitrile; quinolines; ring assembly; ureas | antineoplastic agent; EC 2.7.1.137 (phosphatidylinositol 3-kinase) inhibitor; mTOR inhibitor |
| 2-amino-8-ethyl-4-methyl-6-(1H-pyrazol-5-yl)-7-pyrido[2,3-d]pyrimidinone | pyrazolopyridine | ||
| azd 1480 | |||
| fedratinib | fedratinib: a selective small-molecule inhibitor of JAK2 | sulfonamide | |
| azd5438 | sulfonamide | ||
| pf 04217903 | quinolines | ||
| kx-01 | |||
| mk 5108 | aromatic ether | ||
| sgx 523 | aryl sulfide; biaryl; pyrazoles; quinolines; triazolopyridazine | c-Met tyrosine kinase inhibitor; nephrotoxic agent | |
| quizartinib | benzoimidazothiazole; isoxazoles; morpholines; phenylureas | antineoplastic agent; EC 2.7.10.1 (receptor protein-tyrosine kinase) inhibitor; necroptosis inhibitor | |
| at13148 | |||
| sns 314 | SNS 314: an aurora kinase inhibitor; structure in first source | ureas | |
| cabozantinib | cabozantinib : A dicarboxylic acid diamide that is N-phenyl-N'-(4-fluorophenyl)cyclopropane-1,1-dicarboxamide in which the hydrogen at position 4 on the phenyl ring is substituted by a (6,7-dimethoxyquinolin-4-yl)oxy group. A multi-tyrosine kinase inhibitor, used (as its malate salt) for the treatment of progressive, metastatic, medullary thyroid cancer. cabozantinib: a multikinase inhibitor | aromatic ether; dicarboxylic acid diamide; organofluorine compound; quinolines | antineoplastic agent; tyrosine kinase inhibitor |
| incb-018424 | nitrile; pyrazoles; pyrrolopyrimidine | antineoplastic agent; EC 2.7.10.2 (non-specific protein-tyrosine kinase) inhibitor | |
| plx4032 | aromatic ketone; difluorobenzene; monochlorobenzenes; pyrrolopyridine; sulfonamide | antineoplastic agent; B-Raf inhibitor | |
| as 703026 | pyridinecarboxamide | ||
| baricitinib | azetidines; nitrile; pyrazoles; pyrrolopyrimidine; sulfonamide | anti-inflammatory agent; antirheumatic drug; antiviral agent; EC 2.7.10.2 (non-specific protein-tyrosine kinase) inhibitor; immunosuppressive agent | |
| dabrafenib | 1,3-thiazoles; aminopyrimidine; organofluorine compound; sulfonamide | anticoronaviral agent; antineoplastic agent; B-Raf inhibitor | |
| mk-8033 | 1-(3-(1-methyl-1H-pyrazol-4-yl)-5-oxo-5H-benzo(4,5)cyclohepta(1,2-b)pyridin-7-yl)-N-(pyridin-2-ylmethyl)methanesulfonamide: inhibits both Ron and c-Met kinases; structure in first source | ||
| alectinib | aromatic ketone; morpholines; nitrile; organic heterotetracyclic compound; piperidines | antineoplastic agent; EC 2.7.10.1 (receptor protein-tyrosine kinase) inhibitor | |
| encorafenib | encorafenib: a BRAF inhibitor | ||
| bms-911543 | N,N-dicyclopropyl-4-((1,5-dimethyl-1H-pyrazol-3-yl)amino)-6-ethyl-1-methyl-1,6-dihydroimidazo(4,5-d)pyrrolo(2,3b)pyridine-7-carboxamide: has antineoplastic activity; structure in first source | ||
| azd1208 | |||
| osimertinib | osimertinib : A member of the class of aminopyrimidines that is 4-(1-methylindol-3-yl)pyrimidin-2-amine in which one of the amino hydrogens is replaced by a 2-methoxy-4-[2-(dimethylamino)ethyl](methyl)amino-5-acrylamidophenyl group. Used (as the mesylate salt) for treatment of EGFR T790M mutation positive non-small cell lung cancer. osimertinib: an EGFR tyrosine kinase inhibitor | acrylamides; aminopyrimidine; biaryl; indoles; monomethoxybenzene; secondary amino compound; secondary carboxamide; substituted aniline; tertiary amino compound | antineoplastic agent; epidermal growth factor receptor antagonist |
| otssp167 | OTS167: inhibitor of maternal embryonic leucine zipper kinase (MELK) with potential antineoplastic activity | ||
| osi 027 | OSI 027: inhibits both mTORC1 and mTORC2; structure in first source | ||
| bay 80-6946 | copanlisib : An imidazoquinazoline that is 2,3-dihydroimidazo[1,2-c]quinazoline substituted by (2-aminopyrimidine-5-carbonyl)amino, methoxy, and 3-(morpholin-4-yl)propoxy groups at positions 5, 7 and 8, respectively. It is a intravenous pan-class I PI3K inhibitor used for the treatment of relapsed follicular lymphoma in patients who have received at least 2 prior systemic therapies. copanlisib: an antineoplastic agent with PI3K inhibitory activity; structure in first source |