Inhibitor of nuclear factor kappa-B kinase subunit beta–NF-kappa-B essential modulator protein–protein interface (IKKβ–NEMO PPI)

The IKKβ–NEMO protein–protein interface is a critical regulatory junction within the IKK (IκB kinase) complex, which acts as the master regulator of the NF-κB signaling pathway. This interface is formed by the interaction between the C-terminal NEMO-binding domain (NBD) of IKKβ and the N-terminal coiled-coil domain of NEMO (also known as IKKγ) [PMID: 11035754]. Disrupting this specific interaction prevents the assembly of a functional IKK complex, which is essential for the phosphorylation and subsequent degradation of IκB proteins [PMID: 25833394]. Consequently, NF-κB remains sequestered in the cytoplasm, preventing the transcription of genes involved in inflammation, cell survival, and the immune response [PMID: 30635431]. Targeting this interface is considered a highly selective therapeutic strategy for treating chronic inflammatory diseases and various cancers where NF-κB is constitutively active, as it avoids the broader toxicity often associated with direct kinase inhibitors [PMID: 21844395]. Research has focused on developing NBD peptides and small-molecule peptidomimetics to block this interaction and mitigate disease progression [PMID: 29703835].

Other names

IKKβ-IKKγ interfaceNEMO-binding domain interfaceNBD-NEMO interactionIKK complex assembly interface

Disruption of the IKK complex assembly by preventing the binding of IKKβ to the NEMO scaffold, thereby inhibiting NF-kappa B activation.