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polyubiquitin binding domain of NEMO and related proteins NEMO (NF-kappaB essential modulator) is a regulatory subunit of the kinase complex IKK, which is involved in the activation of NF-kappaB via phosporylation of inhibitory IkappaBs. This mechanism requires the binding of NEMO to ubiquinated substrates. Binding is achieved via the UBAN motif (ubiquitin binding in ABIN and NEMO), which is described in this model. This region of NEMO has also been named CoZi (for coiled-coil 2 and leucine zipper). ABINs (A20-binding inhibitors of NF-kappaB) are sensors for ubiquitin that are involved in regulation of apoptosis, ABIN-1 is presumed to inhibit signalling via the NF-kappaB route. The UBAN motif is also found in optineurin, the product of a gene associated with glaucoma, which has been characterized as a negative regulator of NF-kappaB as well.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",