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PEST, proteolytic signal-containing nuclear protein family PCNP is a PEST-containing nuclear protein that is ubiquitinated by NIRF, a Np95/ICBP90-like RING finger protein. PEST sequences, which are rich in proline (P), glutamic acid (E), serine (S) and threonine (T), are found in a number of short-lived proteins, such as transcription factors and cell cycle-associated proteins. Their function is generally controlled by proteolysis, mostly via ubiquitin-mediated degradation. Thus, NIRF and PCNP are a ubiquitin ligase and its substrate, respectively, that may constitute a novel signalling pathway with some relation to cell proliferation. |
Jiyao W et al.(2023). "The conserved domain database in 2023.",