In molecular biology, BEN domain is a conserved protein domain found in a variety of eukaryotic transcriptional regulators and chromatin-associated proteins. It is named after three proteins in which it was first identified: BANP, E5R, and NAC1.^[1] The BEN domain is thought to play a critical role in protein-DNA and protein-protein interactions, particularly in gene silencing, transcriptional regulation, and chromatin organization. It is commonly involved in processes such as development, differentiation, and the maintenance of cellular identity through epigenetic regulation.

Structure

This domain is predicted to form an all-alpha fold with four conserved helices. Its conservation pattern revealed several conserved residues, most of which have hydrophobic side-chains and are likely to stabilize the fold through helix-helix packing.^[1] First human BEN domain (BEND3)structure is solved together with TPR (ERCC6L)domain and Stimulates the ERCC6L translocase and ATPase activities.^[2]

Function

The BEN domain is predicted to function as an adaptor for the higher-order structuring of chromatin, and recruitment of chromatin modifying factors in transcriptional regulation. It has been suggested to mediate protein-DNA and protein-protein interactions during chromatin organization and transcription. The presence of BEN domains in a poxviral early virosomal protein and in polydnaviral proteins also suggests a possible role in the organisation of viral DNA during replication or transcription. They are generally linked to other globular domains with functions related to transcriptional regulation and chromatin structure, such as BTB, C4DM, and C2H2 fingers.^[1]

Examples

The BEN domain is found across the tree of life. In humans, it is found in 9 proteins: BANP, BEND2, BEND3, BEND4, BEND5, BEND6, BEND7, NACC1 (BEND8) and NACC2 (BEND9).

References

Further reading