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NUT protein This family includes the NUT protein. The gene encoding for NUT protein (Nuclear Testis protein) is found fused to BRD3 or BRD4 genes, in some aggressive types of carcinoma, due to chromosomal translocations. Proteins of the BRD family contain two bromodomains that bind transcriptionally active chromatin through associations with acetylated histones H3 and H4. Such proteins are crucial for the regulation of cell cycle progression. On the other hand, little is known about NUT protein. NUT is known to have a Nuclear Export Sequence (NES) as well as a Nuclear localization Signal (NLS), both located towards the C-terminal end of the protein. A fused NUT-GFP protein showed either cytoplasmic or nuclear localization, suggesting that it is subject to nuclear/cytoplasmic shuttling. Consistent with this possibility, treatment with leptomycin B an inhibitor of CRM1-dependent nuclear export resulted in re-distribution of NUT-GFP to the nucleus. Inspection of NUT revealed a C-terminal sequence similar to known nuclear export sequences (NES) which are often regulated by phosphorylation. This family carries some natively unstructured sequence. |
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Jiyao W et al.(2023). "The conserved domain database in 2023.",