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Ref Type Journal Article
PMID (29753091)
Authors Kinoshita-Kikuta E, Kinoshita E, Ueda S, Ino Y, Kimura Y, Hirano H, Koike T
Title Increase in constitutively active MEK1 species by introduction of MEK1 mutations identified in cancers.
Journal Vol Issue Date Pages Journal Short Title
Biochimica et biophysica acta 2018 May 09 62-70 Biochim Biophys Acta Proteins Proteom
URL
Abstract Text The kinase MEK1 is an essential component of the mitogen-activated protein kinase cascades. Somatic mutations that have been identified in the MEK1-coding gene generally enhance kinase activity. Consequently, MEK1 has attracted much interest as a target for cancer therapy to block the aberrant activity. By using Phos-tag affinity electrophoresis, we found that the introduction of mutations detected in certain sporadic cancers or in MEK-inhibitor-resistant cancer cells produced constitutively active MEK1 species containing phosphorylated Ser-218 and Ser-222 residues; it also enhanced the constitutive activity of the kinase. Phosphorylation profiling of the mutants in the presence of inhibitors of RAF/MEK demonstrated that several mutations conferred resistance to multiple inhibitors as a result of an increase in the quantity of active MEK1 species containing the two phosphorylated Ser-218 and Ser-222 residues. Phos-tag-based phosphorylation profiling of MEK1 can therefore provide clinical insights into characteristics of individual mutations in the MEK1-coding gene.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
MAP2K1 NCBI CFC3|MAPKK1|MEK1|MEL|MKK1|PRKMK1 MAP2K1 (MEK1), mitogen-activated protein kinase kinase 1, is a serine-threonine kinase, which activates the RAS-RAF-MEK-ERK pathway in cell proliferation and differentiation (PMID: 22753777). MAP2K1 (MEK1) activating mutations have been identified in a number of solid tumor types including, melanoma (PMID: 29753091), colorectal (PMID: 28819429), lung adenocarcinoma (PMID: 25351745, PMID: 32361034), histiocytic sarcoma (PMID: 29768143), and Map2k1 mutations are often associated with resistance to Mek and Raf inhibition (PMID: 29753091). Oncogene
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
MAP2K1 C121S missense gain of function MAP2K1 C121S lies within the protein kinase domain of the Map2k1 protein (UniProt.org). C121S confers a gain of function on the Map2k1 protein as demonstrated by increased Erk1/2 (PMID: 25899310) and Mek phosphorylation in culture and confers acquired resistance to Raf and Mek inhibitors (PMID: 21383288, PMID: 24448821, PMID: 29483135, PMID: 29753091). Y
MAP2K1 E203Q missense no effect MAP2K1 E203Q lies within the protein kinase domain of the Map2k1 protein (UniProt.org). E203Q has been demonstrated to have autophosphorylation and kinase activities similar to wild-type Map2k1 in in vitro assays (PMID: 29753091).
MAP2K1 F129L missense gain of function MAP2K1 F129L lies within the protein kinase domain of the Map2k1 protein (UniProt.org). F129L confers a gain of function to the Map2k1 protein as demonstrated by increased kinase activity compared to wild-type, activation of downstream Erk signaling, and increased binding affinity to c-Raf (PMID: 21705440) and also demonstrates resistance to some Mek and Braf inhibitors (PMID: 29753091). Y
MAP2K1 F53L missense gain of function MAP2K1 F53L lies within the negative regulatory region of the Map2k1 protein (PMID: 24241536). F53L results in activation of Map2k1 as indicated by increased Erk and Mek phosphorylation (PMID: 25164765, PMID: 29483135), increased Rsk phosphorylation (PMID: 25351745), transformation activity in culture (PMID: 25351745, PMID: 36442478), and increased proliferation in a competition assay (PMID: 36442478), and demonstrates resistance to some Mek and Braf inhibitors (PMID: 29753091, PMID: 36442478). Y
MAP2K1 F53S missense gain of function MAP2K1 F53S lies within the negative regulatory region of the Map2k1 protein (PMID: 24241536). F53S demonstrates phosphorylation profile similar to wild-type Map2k1 (PMID: 29753091), and results in increased Erk phosphorylation in cell culture (PMID: 16439621, PMID: 12370306).
MAP2K1 G128N missense no effect - predicted MAP2K1 G128N lies within the protein kinase domain of the Map2k1 protein (UniProt.org). G128N results in autophosphorylation levels similar to wild-type Map2k1 in an in vitro assay (PMID: 29753091), and therefore, is predicted to have no effect on Map2k1 protein function.
MAP2K1 G128V missense unknown MAP2K1 G128V lies within the protein kinase domain of the Map2k1 protein (UniProt.org). G128V results in autophosphorylation levels similar to wild-type Map2k1 in an in vitro assay (PMID: 29753091) and has been described as a drug resistance mutation (PMID: 24265153), but leads to increased Erk phosphorylation, enhanced cell cycle progression, increased colony formation, and elevated autophagy induction compared to wild-type Map2k1 in culture (PMID: 31972311), and therefore, its effect on Map2k1 protein function is unknown. Y
MAP2K1 I103N missense gain of function MAP2K1 I103N lies within the protein kinase domain of the Map2k1 protein (UniProt.org). I103N confers a gain of function to the Map2k1 protein as demonstrated by elevated basal kinase activity in an in vitro assay (PMID: 12370306), increased Map2k1 autophosphorylation (PMID: 29753091), and transformation activity in cell culture and increased proliferation in a competition assay (PMID: 36442478), and is also associated with resistance to Mek inhibitors (PMID: 12370306, PMID: 19915144). Y
MAP2K1 I111S missense gain of function MAP2K1 I111S lies within the protein kinase domain of the Map2k1 protein (UniProt.org). I111S confers a gain of function on the Map2k1 protein as demonstrated by increased autophosphorylation and Erk phosphorylation and also demonstrates resistance to some Mek and Braf inhibitors (PMID: 29753091). Y
MAP2K1 K57N missense gain of function MAP2K1 K57N lies within the negative regulatory region of the Map2k1 protein (PMID: 24241536). K57N confers a gain of function to Map2k1 as demonstrated by increased autophosphorylation (PMID: 29753091) and Erk phosphorylation (PMID: 18632602, PMID: 29753091), increased cell proliferation and cell viability in two different cell lines (PMID: 29533785, PMID: 18632602), transformation of cultured cells (PMID: 25351745, PMID: 36442478), increased proliferation in a competition assay (PMID: 36442478), and demonstrates resistance to some Mek and Braf inhibitors (PMID: 29753091, PMID: 36442478). Y
MAP2K1 K59del deletion unknown MAP2K1 K59del results in the deletion of an amino acid in the protein kinase domain of the Map2k1 protein at amino acid 59 (UniProt.org). K59del results in increased Mek and Erk phosphorylation in culture (PMID: 22389471), but demonstrates autophosphorylation levels similar to wild-type Map2k1 in another study (PMID: 29753091), and therefore, its effect on Map2k1 protein function is unknown.
MAP2K1 L115P missense gain of function MAP2K1 L115P lies within the protein kinase domain of the Map2k1 protein (UniProt.org). L115P confers a gain of function on the kinase activity of the Map2k1 protein, as demonstrated by increased autophosphorylation in cell culture (PMID: 29753091) and increased basal kinase activity in an in vitro assay (PMID: 12370306), and is also associated with decreased binding and resistance to Mek inhibitors (PMID: 12370306, PMID: 19915144, PMID: 26399658). Y
MAP2K1 L42F missense gain of function - predicted MAP2K1 L42F lies within the negative regulatory region of the Map2k1 protein (PMID: 24241536). L42F results in autophosphorylation and kinase activity similar to wild-type Map2k1 in in vitro assays (PMID: 29753091), proliferation similar to wild-type in a competition assay, but increased transformation activity (PMID: 36442478) and increased Erk phosphorylation in cultured cells (PMID: 32641410), and therefore, is predicted to lead to a gain of Map2k1 protein function.
MAP2K1 P124Q missense unknown MAP2K1 P124Q lies within the protein kinase domain of the Map2k1 protein (UniProt.org). P124Q results in increased Erk1/2 phosphorylation in culture, and is associated with decreased sensitivity to Raf inhibition (PMID: 25370473), but demonstrates autophosphorylation and kinase activity similar to wild-type Map2k1 in another study (PMID: 29753091), and therefore, its effect on Map2k1 protein function is unknown.
MAP2K1 Q56P missense gain of function MAP2K1 Q56P does not lie within any known functional domains of the Map2k1 protein (UniProt.org). Q56P confers a gain of function to the Map2k1 protein as indicated by increased kinase activity and the ability to transform cultured cells (PMID: 7651428, PMID: 22327936, PMID: 25351745) and increased proliferation in a competition assay (PMID: 36442478), and demonstrates resistance to some Mek and Braf inhibitors (PMID: 29753091). Y
MAP2K1 T55P missense unknown MAP2K1 T55P does not lie within any known functional domains of the Map2k1 protein (UniProt.org). T55P results in autophosphorylation levels similar to wild-type Map2k1 in an in vitro assay (PMID: 29753091), but leads to increased Erk phosphorylation in cultured cells in another study (PMID: 32641410), and therefore, its effect on Map2k1 protein function is unknown.
MAP2K1 V211D missense gain of function MAP2K1 V211D lies within the protein kinase domain of the Map2k1 protein (UniProt.org). V211D confers a gain of function to Map2k1, as demonstrated by increased phosphorylation of Mek and Erk in cultured cells and in vitro kinase assays, and also demonstrates Braf and Mek inhibitor resistance (PMID: 29753091, PMID: 19915144, PMID: 31227518). Y
MAP2K1 Y130C missense unknown MAP2K1 Y130C lies within the protein kinase domain of the Map2k1 protein (UniProt.org). Y130C demonstrates a phosphorylation profile similar to wild-type Map2k1 (PMID: 29753091), but in another study results in increased Erk phosphorylation in cell culture (PMID: 16439621, PMID: 18060073, PMID: 17981815, PMID: 31972311), and elevated cell cycle progression and colony formation compared to wild-type Map2k1 (PMID: 31972311), and therefore, its effect on Map2k1 protein function is unknown.
MAP2K1 Y130H missense unknown MAP2K1 Y130H lies within the protein kinase domain of the Map2k1 protein (UniProt.org). Y130H results in autophosphorylation levels similar to wild-type Map2k1 in an in vitro assay (PMID: 29753091), but leads to increased Erk phosphorylation in cultured cells in another study (PMID: 32641410), and therefore, its effect on Map2k1 protein function is unknown.
MAP2K1 Y130N missense no effect - predicted MAP2K1 Y130N lies within the protein kinase domain of the Map2k1 protein (UniProt.org). Y130N has been demonstrated to result in autophosphorylation levels similar to wild-type Map2k1 in an in vitro assay (PMID: 29753091), and therefore, is predicted to have no effect on Map2k1 protein function.
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
MAP2K1 F53L Advanced Solid Tumor resistant PD98059 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 F53L displayed resistance to the Mek inhibitor, PD98059, as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 Q56P Advanced Solid Tumor sensitive Selumetinib Preclinical - Cell culture Actionable In a preclinical study, Map2k1 Q56P displayed sensitivity to the Mek inhibitor, Selumetinib (AZD6244), as demonstrated by reversal of active Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 F53L Advanced Solid Tumor resistant AZD8330 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 F53L displayed resistance to the Mek inhibitor, AZD8330, as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 F129L Advanced Solid Tumor resistant AZD8330 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 F129L displayed resistance to the Mek inhibitor, AZD8330, as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 I111S Advanced Solid Tumor resistant PD98059 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 I111S displayed resistance to the Mek inhibitor, PD98059, as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 C121S Advanced Solid Tumor resistant PD98059 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 C121S displayed resistance to the Mek inhibitor, PD98059, as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 K57N Advanced Solid Tumor sensitive PLX4720 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 K57N displayed sensitivity to the Braf inhibitor, PLX4720, as demonstrated by reversal of active Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 F53L Advanced Solid Tumor resistant Regorafenib Preclinical - Cell culture Actionable In a preclinical study, Map2k1 F53L displayed resistance to Stivarga (regorafenib; BAY 73-4506), as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 F129L Advanced Solid Tumor sensitive Selumetinib Preclinical - Cell culture Actionable In a preclinical study, Map2k1 F129L displayed sensitivity to the Mek inhibitor, Selumetinib (AZD6244), as demonstrated by reversal of active Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 I111S Advanced Solid Tumor resistant GDC0879 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 I111S displayed resistance to the Braf inhibitor, GDC-0879, as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 I111S Advanced Solid Tumor resistant Regorafenib Preclinical - Cell culture Actionable In a preclinical study, Map2k1 I111S displayed resistance to Stivarga (regorafenib; BAY 73-4506), as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 C121S Advanced Solid Tumor resistant AZD8330 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 C121S displayed resistance to the Mek inhibitor, AZD8330, as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 Q56P Advanced Solid Tumor resistant Regorafenib Preclinical - Cell culture Actionable In a preclinical study, Map2k1 Q56P displayed resistance to Stivarga (regorafenib; BAY 73-4506), as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 F129L Advanced Solid Tumor resistant Regorafenib Preclinical - Cell culture Actionable In a preclinical study, Map2k1 F129L displayed resistance to Stivarga (regorafenib; BAY 73-4506), as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 Q56P Advanced Solid Tumor resistant PD98059 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 Q56P displayed resistance to the Mek inhibitor, PD98059, as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 K57N Advanced Solid Tumor sensitive Selumetinib Preclinical - Cell culture Actionable In a preclinical study, Map2k1 K57N displayed sensitivity to the Mek inhibitor, Selumetinib (AZD6244), as demonstrated by reversal of active Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 I111S Advanced Solid Tumor resistant AZD8330 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 I111S displayed resistance to the Mek inhibitor, AZD8330, as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 V211D Advanced Solid Tumor resistant Regorafenib Preclinical - Cell culture Actionable In a preclinical study, Map2k1 V211D displayed resistance to Stivarga (regorafenib; BAY 73-4506), as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 K57N Advanced Solid Tumor resistant GDC0879 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 K57N displayed resistance to the Braf inhibitor, GDC-0879, as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 K57N Advanced Solid Tumor resistant Regorafenib Preclinical - Cell culture Actionable In a preclinical study, Map2k1 K57N displayed resistance to Stivarga (regorafenib; BAY 73-4506), as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 I111S Advanced Solid Tumor sensitive Selumetinib Preclinical - Cell culture Actionable In a preclinical study, Map2k1 I111S displayed sensitivity to the Mek inhibitor, Selumetinib (AZD6244), as demonstrated by reversal of active Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 F53L Advanced Solid Tumor sensitive PLX4720 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 F53L displayed sensitivity to the Braf inhibitor, PLX4720, as demonstrated by reversal of active Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 V211D Advanced Solid Tumor resistant AZD8330 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 V211D displayed resistance to the Mek inhibitor, AZD8330, as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 V211D Advanced Solid Tumor resistant PD98059 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 V211D displayed resistance to the Mek inhibitor, PD98059, as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 K57N Advanced Solid Tumor resistant AZD8330 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 K57N displayed resistance to the Mek inhibitor, AZD8330, as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 V211D Advanced Solid Tumor resistant Selumetinib Preclinical Actionable In a preclinical study, Map2k1 V211D displayed resistance to the Mek inhibitor, Selumetinib (AZD6244), as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 Q56P Advanced Solid Tumor resistant AZD8330 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 Q56P displayed resistance to the Mek inhibitor, AZD8330, as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 K57N Advanced Solid Tumor resistant PD98059 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 K57N displayed resistance to the Mek inhibitor, PD98059, as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 Q56P Advanced Solid Tumor resistant GDC0879 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 Q56P displayed resistance to the Braf inhibitor, GDC-0879, as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 C121S Advanced Solid Tumor resistant GDC0879 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 C121S displayed resistance to the Braf inhibitor, GDC-0879, as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 C121S Advanced Solid Tumor sensitive PLX4720 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 C121S displayed sensitivity to the Braf inhibitor, PLX4720, as demonstrated by reversal of active Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 I111S Advanced Solid Tumor sensitive PLX4720 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 I111S displayed sensitivity to the Braf inhibitor, PLX4720, as demonstrated by reversal of active Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 C121S Advanced Solid Tumor resistant Regorafenib Preclinical - Cell culture Actionable In a preclinical study, Map2k1 C121S displayed resistance to Stivarga (regorafenib; BAY 73-4506), as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 V211D Advanced Solid Tumor sensitive PLX4720 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 V211D displayed sensitivity to the Braf inhibitor, PLX4720, as demonstrated by reversal of active Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 V211D Advanced Solid Tumor resistant GDC0879 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 V211D displayed resistance to the Braf inhibitor, GDC-0879, as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 F129L Advanced Solid Tumor resistant PD98059 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 F129L displayed resistance to the Mek inhibitor, PD98059, as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 Q56P Advanced Solid Tumor sensitive PLX4720 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 Q56P displayed sensitivity to the Braf inhibitor, PLX4720, as demonstrated by reversal of active Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 F53L Advanced Solid Tumor resistant GDC0879 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 F53L displayed resistance to the Braf inhibitor, GDC-0879, as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 F129L Advanced Solid Tumor sensitive PLX4720 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 F129L displayed sensitivity to the Braf inhibitor, PLX4720, as demonstrated by reversal of active Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 C121S Advanced Solid Tumor sensitive Selumetinib Preclinical - Cell culture Actionable In a preclinical study, Map2k1 C121S displayed sensitivity to the Mek inhibitor, Selumetinib (AZD6244), as demonstrated by reversal of active Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 F53L Advanced Solid Tumor sensitive Selumetinib Preclinical - Cell culture Actionable In a preclinical study, Map2k1 F53L displayed sensitivity to the Mek inhibitor, Selumetinib (AZD6244), as demonstrated by reversal of active Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091
MAP2K1 F129L Advanced Solid Tumor resistant GDC0879 Preclinical - Cell culture Actionable In a preclinical study, Map2k1 F129L displayed resistance to the Braf inhibitor, GDC-0879, as demonstrated by constitutive activation of Map2k1 in transformed human kidney cells (PMID: 29753091). 29753091