Nucleophosmin 1 protein (NPM1)

Nucleophosmin 1 protein (NPM1) is a ubiquitously expressed, abundantly encoded nucleolar phosphoprotein found in human cells. It acts as a multifunctional chaperone, primarily in the nucleolus, but shuttles dynamically between the nucleus and cytoplasm. NPM1 is composed of several functional domains: an N-terminal oligomerization domain, a central acidic region for histone and nucleic acid binding, and a C-terminal nucleic acid-binding domain featuring a unique nucleolar localization signal. NPM1 participates in ribosome biogenesis, chromatin remodeling, mRNA processing, genome stability, DNA repair, and regulation of apoptosis and cell proliferation. Notably, NPM1 is mutated or translocated in a significant percentage of acute myeloid leukemia (AML) cases and some lymphomas, making its mutation a critical clinical biomarker and therapeutic target. Targeted therapy approaches focus either on correcting NPM1 localization or interfering with its protein-protein and nucleic acid interactions, yet direct, clinically approved inhibitors are not in routine use due to its central role in normal cell biology and associated toxicity concerns[1][2][3][6][7][8].

Other names

nucleophosminnucleolar phosphoprotein B23numatrinB23No38

Inhibiting nuclear export (to retain NPM1 and tumor suppressors in the nucleus) - Disrupting NPM1 oligomerization and nucleolar localization - Promoting apoptosis in cancer cells by interfering with NPM1’s chaperone and DNA repair functions