N-terminal sub-domain of the Rel homology domain (RHD) of the arthropod protein Relish
Proteins containing the Rel homology domain (RHD) are metazoan transcription factors. The RHD is composed of two structural sub-domains; this model characterizes the N-terminal RHD sub-domain of the arthropod Relish protein, in which the RHD domain co-occurs with C-terminal ankyrin repeats. Family members are sometimes referred to as p110 or p68 (proteolytically processed form). Relish is an NF-kappa B-like transcription factor, which plays a role in mediating innate immunity in Drosophila. It is activated via the Imd (immune deficiency) pathway, which triggers phosphorylation of Relish. IKK-dependent proteolytic cleavage of Relish (which involves Dredd) results in a smaller active form (without the C-terminal ankyrin repeats), which is transported into the nucleus and functions as a transactivator.