Mitogen-activated protein kinase 14:MAP kinase-activated protein kinase 2 complex (p38α:MK2 complex)

The p38α:MK2 protein-protein complex is a pivotal signaling unit within the p38 mitogen-activated protein kinase (MAPK) pathway, playing a central role in the regulation of pro-inflammatory cytokines. p38α (MAPK14) serves as the upstream kinase that binds to and activates MK2 (MAPKAPK2) through phosphorylation. Once activated, the complex facilitates the nuclear export of MK2, which subsequently stabilizes and promotes the translation of mRNAs encoding inflammatory mediators like TNF-α and IL-6 (UniProt P47811, P49137). This specific interaction has become a high-interest therapeutic target because traditional ATP-competitive p38 inhibitors often suffer from poor selectivity and significant clinical toxicity, such as hepatotoxicity (PubMed: 26133730). By developing small molecules that specifically disrupt the p38α:MK2 protein-protein interaction (PPI), researchers aim to achieve more precise modulation of the inflammatory response with fewer off-target effects. This approach is currently being explored for the treatment of chronic inflammatory conditions, including rheumatoid arthritis and psoriasis, as well as in oncology to overcome resistance to certain chemotherapies (PubMed: 30256069). The complex also regulates the phosphorylation of heat shock protein 27 (HSP27), further influencing cytoskeletal dynamics and cell survival. Targeting the PPI interface offers a mechanism to inhibit the p38 pathway that is distinct from traditional catalytic site inhibition.

Other names

MAPK14:MAPKAPK2 complexp38-alpha:MK2 complexp38:MK2 heterodimerp38-MAPK:MK2 complex

Inhibition of protein-protein interaction (PPI) between p38α and MK2, prevention of MK2 phosphorylation by p38α, and allosteric modulation of the kinase complex.