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ERK1
Mitogen-activated protein kinase 3, also known as p44MAPK and ERK1, is an enzyme that in humans is encoded by the ''MAPK3'' gene. Function The protein encoded by this gene is a member of the mitogen-activated protein kinase (MAP kinase) family. MAP kinases, also known as extracellular signal-regulated kinases (ERKs), act in a signaling cascade that regulates various cellular processes such as proliferation, differentiation, and cell cycle progression in response to a variety of extracellular signals. This kinase is activated by upstream kinases, resulting in its translocation to the nucleus where it phosphorylates nuclear targets. Alternatively spliced transcript variants encoding different protein isoforms have been described. Clinical significance It has been suggested that MAPK3, along with the gene IRAK1, is turned off by two microRNAs that were activated after the influenza A virus had been made to infect human lung cells. Signaling pathways Pharmacological inhib ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mitogen-activated Protein Kinase
A mitogen-activated protein kinase (MAPK or MAP kinase) is a type of protein kinase that is specific to the amino acids serine and threonine (i.e., a serine/threonine-specific protein kinase). MAPKs are involved in directing cellular responses to a diverse array of stimuli, such as mitogens, osmotic stress, heat shock and proinflammatory cytokines. They regulate cell functions including proliferation, gene expression, differentiation, mitosis, cell survival, and apoptosis. MAP kinases are found in eukaryotes only, but they are fairly diverse and encountered in all animals, fungi and plants, and even in an array of unicellular eukaryotes. MAPKs belong to the CMGC (CDK/MAPK/GSK3/CLK) kinase group. The closest relatives of MAPKs are the cyclin-dependent kinases (CDKs). Discovery The first mitogen-activated protein kinase to be discovered was ERK1 (MAPK3) in mammals. Since ERK1 and its close relative ERK2 (MAPK1) are both involved in growth factor signaling, the family was term ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Extracellular Signal-regulated Kinases
In molecular biology, extracellular signal-regulated kinases (ERKs) or classical MAP kinases are widely expressed protein kinase intracellular signalling molecules that are involved in functions including the regulation of meiosis, mitosis, and postmitotic functions in differentiated cells. Many different stimuli, including growth factors, cytokines, virus infection, ligands for heterotrimeric G protein-coupled receptors, transforming agents, and carcinogens, activate the ERK pathway. The term, "extracellular signal-regulated kinases", is sometimes used as a synonym for mitogen-activated protein kinase (MAPK), but has more recently been adopted for a specific subset of the mammalian MAPK family. In the MAPK/ERK pathway, Ras activates c-Raf, followed by mitogen-activated protein kinase kinase (abbreviated as MKK, MEK, or MAP2K) and then MAPK1/2 (below). Ras is typically activated by growth hormones through receptor tyrosine kinases and GRB2/ SOS, but may also receive other s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MAP2K2
Dual specificity mitogen-activated protein kinase kinase 2 is an enzyme that in humans is encoded by the ''MAP2K2'' gene. It is more commonly known as MEK2, but has many alternative names including CFC4, MKK2, MAPKK2 and PRKMK2. Function The protein encoded by this gene is a dual specificity protein kinase that belongs to the MAP kinase kinase family. This kinase is known to play a critical role in mitogen growth factor signal transduction. It phosphorylates and thus activates MAPK1/ERK2 and MAPK3/ERK1. The activation of this kinase itself is dependent on the Ser/Thr phosphorylation by MAP kinase kinase kinases. The inhibition or degradation of this kinase is found to be involved in the pathogenesis of Yersinia and anthrax. Interactions MAP2K2 has been shown to interact with MAPK3 and ARAF Serine/threonine-protein kinase A-Raf or simply A-Raf is an enzyme that in humans is encoded by the ''ARAF'' gene. A-Raf is a member of the Raf kinase family of serine/threonine-sp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
GSK3β
Glycogen synthase kinase-3 beta, (GSK-3 beta), is an enzyme that in humans is encoded by the ''GSK3B'' gene. In mice, the enzyme is encoded by the Gsk3b gene. Abnormal regulation and expression of GSK-3 beta is associated with an increased susceptibility towards bipolar disorder. Function Glycogen synthase kinase-3 (GSK-3) is a proline-directed serine-threonine kinase that was initially identified as a phosphorylating and an inactivating agent of glycogen synthase. Two isoforms, alpha (GSK3A) and beta, show a high degree of amino acid homology. GSK3B is involved in energy metabolism, neuronal cell development, and body pattern formation. It might be a new therapeutic target for ischemic stroke. Disease relevance Homozygous disruption of the Gsk3b locus in mice results in embryonic lethality during mid-gestation. This lethality phenotype could be rescued by inhibition of tumor necrosis factor. Two SNPs at this gene, rs334558 (-50T/C) and rs3755557 (-1727A/T), are associat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MAP2K1
Dual specificity mitogen-activated protein kinase kinase 1 is an enzyme that in humans is encoded by the ''MAP2K1'' gene. Function The protein encoded by this gene is a member of the dual-specificity protein kinase family that acts as a mitogen-activated protein (MAP) kinase kinase. MAP kinases, also known as extracellular signal-regulated kinases (ERKs), act as an integration point for multiple biochemical signals. This protein kinase lies upstream of MAP kinases and stimulates the enzymatic activity of MAP kinases upon activation by a wide variety of extra- and intracellular signals. As an essential component of the MAP kinase signal transduction pathway, this kinase is involved in many cellular processes such as proliferation, differentiation, transcription regulation and development. MAP2K1 is altered in 1.05% of all human cancers. Meiosis The genomes of diploid organisms in natural populations are highly polymorphic for insertions and deletions. During meiosis do ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RPS6KA2
Ribosomal protein S6 kinase alpha-2 is an enzyme that in humans is encoded by the ''RPS6KA2'' gene. This gene encodes a member of the RSK (ribosomal S6 kinase) family of serine and threonine kinases. This kinase contains 2 non-identical kinase catalytic domains and phosphorylates various substrates, including members of the mitogen-activated kinase (MAPK) signalling pathway. The activity of this protein has been implicated in controlling cell growth and differentiation. Alternate transcriptional splice variants, encoding different isoforms, have been characterized. Interactions RPS6KA2 has been shown to interact with MAPK3 and MAPK1 Mitogen-activated protein kinase 1, (MAPK 1), also known as ERK2, is an enzyme that in humans is encoded by the ''MAPK1'' gene. Function The protein encoded by this gene is a member of the MAP kinase family. MAP kinases, also known as extracel .... References Further reading * * * * * * * * * * * * * * * * * * * EC 2.7.11 {{gene ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PTPN7
Protein tyrosine phosphatase non-receptor type 7 is an enzyme that in humans is encoded by the ''PTPN7'' gene. Function The protein encoded by this gene is a member of the protein tyrosine phosphatase (PTP) family. PTPs are known to be signaling molecules that regulate a variety of cellular processes including cell growth, differentiation, mitotic cycle, and oncogenic transformation. This gene is preferentially expressed in a variety of hematopoietic cells, and is an early response gene in lymphokine stimulated cells. The noncatalytic N-terminus of this PTP can interact with MAP kinases and suppress the MAP kinase activities. This PTP was shown to be involved in the regulation of T cell antigen receptor (TCR) signaling, which was thought to function through dephosphorylating the molecules related to MAP kinase pathway. Two alternatively spliced transcript variants encoding different isoforms have been found for this gene. Interactions PTPN7 has been shown to interact with MA ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HDAC4
Histone deacetylase 4, also known as HDAC4, is a protein that in humans is encoded by the ''HDAC4'' gene. Function Histones play a critical role in transcriptional regulation, cell cycle progression, and developmental events. Histone acetylation/deacetylation alters chromosome structure and affects transcription factor access to DNA. The protein encoded by this gene belongs to class II of the histone deacetylase/acuc/apha family. It possesses histone deacetylase activity and represses transcription when tethered to a promoter. This protein does not bind DNA directly but through transcription factors MEF2C and MEF2D. It seems to interact in a multiprotein complex with RbAp48 and HDAC3. Furthermore, HDAC4 is required for TGFbeta1-induced myofibroblastic differentiation. Clinical significance Studies have shown that HDAC4 regulates bone and muscle development. Harvard University researchers also concluded that it promotes healthy vision: Reduced levels of the protein led to the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
GTF2I
General transcription factor II-I is a protein that in humans is encoded by the ''GTF2I'' gene. Function This gene encodes a multifunctional phosphoprotein, TFII-I, with roles in transcription and signal transduction. Haploinsuffiency (deletion of one copy) of the GTF2I gene is noted in Williams-Beuren syndrome, a multisystem developmental disorder caused by the deletion of contiguous genes at chromosome 7q11.23. It is duplicated in the 7q11.23 duplication syndrome. The exon(s) encoding 5' UTR has not been fully defined, but this gene is known to contain at least 34 exons, and its alternative splicing generates 4 transcript variants in humans. A single gain-of-function point mutation in GTF2I is also found in certain Thymomas. Single nucleotide polymorphism (SNP) in GTF2I is correlated to autoimmune disorders. Interactions GTF2I has been shown to interact with: * Bruton's tyrosine kinase, * HDAC3, * Histone deacetylase 2, * MAPK3, * Myc, * PRKG1, * Serum response fa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DUSP6
Dual specificity phosphatase 6 (DUSP6) is an enzyme that in humans is encoded by the ''DUSP6'' gene. Function The protein encoded by this gene is a member of the dual specificity protein phosphatase subfamily. These phosphatases inactivate their target kinases by dephosphorylating both the phosphoserine/threonine and phosphotyrosine residues. They negatively regulate members of the mitogen-activated protein (MAP) kinase superfamily (MAPK/ERK, SAPK/JNK, p38), which are associated with cellular proliferation and differentiation. Different members of the family of dual specificity phosphatases show distinct substrate specificities for various MAP kinases, different tissue distribution and subcellular localization, and different modes of inducibility of their expression by extracellular stimuli. This gene product inactivates ERK2, is expressed in a variety of tissues with the highest levels in heart and pancreas and, unlike most other members of this family, is localized in the cyto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DUSP3
Dual specificity protein phosphatase 3 is an enzyme that in humans is encoded by the ''DUSP3'' gene. The protein encoded by this gene is a member of the dual specificity protein phosphatase subfamily. These phosphatases inactivate their target kinases by dephosphorylating both the phosphoserine/threonine and phosphotyrosine residues. They negatively regulate members of the mitogen-activated protein (MAP) kinase superfamily (MAPK/ERK, SAPK/JNK, p38), which are associated with cellular proliferation and differentiation. Different members of the family of dual specificity phosphatases show distinct substrate specificities for various MAP kinases, different tissue distribution and subcellular localization, and different modes of inducibility of their expression by extracellular stimuli. This gene maps in a region that contains the BRCA1 locus which confers susceptibility to breast and ovarian cancer. Although DUSP3 is expressed in both breast and ovarian tissues, mutation screening in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
