MAPK7 phospho T219 + Y221
Domain
The second proline-rich region may interact with actin targeting the kinase to a specific location in the cell.
The TXY motif contains the threonine and tyrosine residues whose phosphorylation activates the MAP kinases.
Function
Plays a role in various cellular processes such as proliferation, differentiation and cell survival. The upstream activator of MAPK7 is the MAPK kinase MAP2K5. Upon activation, it translocates to the nucleus and phosphorylates various downstream targets including MEF2C. EGF activates MAPK7 through a Ras-independent and MAP2K5-dependent pathway. As part of the MAPK/ERK signaling pathway, acts as a negative regulator of apoptosis in cardiomyocytes via interaction with STUB1/CHIP and promotion of STUB1-mediated ubiquitination and degradation of ICER-type isoforms of CREM (By similarity). May have a role in muscle cell differentiation. May be important for endothelial function and maintenance of blood vessel integrity. MAP2K5 and MAPK7 interact specifically with one another and not with MEK1/ERK1 or MEK2/ERK2 pathways. Phosphorylates SGK1 at Ser-78 and this is required for growth factor-induced cell cycle progression. Involved in the regulation of p53/TP53 by disrupting the PML-MDM2 interaction.
Post-translational modifications
Dually phosphorylated on Thr-219 and Tyr-221, which activates the enzyme (By similarity). Autophosphorylated in vitro on threonine and tyrosine residues when the C-terminal part of the kinase, which could have a regulatory role, is absent.
Sequence Similarities
Belongs to the protein kinase superfamily. CMGC Ser/Thr protein kinase family. MAP kinase subfamily.
Tissue Specificity
Expressed in many adult tissues. Abundant in heart, placenta, lung, kidney and skeletal muscle. Not detectable in liver.
Cellular localization
- Cytoplasm
- Nucleus
- Nucleus
- PML body
- Translocates to the nucleus upon activation.
Alternative names
BMK1, ERK5, PRKM7, MAPK7, Mitogen-activated protein kinase 7, MAP kinase 7, MAPK 7, Big MAP kinase 1, Extracellular signal-regulated kinase 5, BMK-1, ERK-5