Nucleophosmin (NPM), also known as nucleolar phosphoprotein B23 or numatrin, is a protein that in humans is encoded by the NPM1 gene. NPM1 is associated with nucleolar ribonucleoprotein structures and binds single-stranded and double-stranded nucleic acids, but it binds preferentially G-quadruplex forming nucleic acids. It is involved in the biogenesis of ribosomes and may assist small basic proteins in their transport to the nucleolus. Its regulation through SUMOylation (by SENP3 and SENP5) is another facet of the protein's regulation and cellular functions. It is located in the nucleolus, but it can be translocated to the nucleoplasm in case of serum starvation or treatment with anticancer drugs.
Background References
1. Cela I et al. Nucleophosmin in Its Interaction with Ligands. Int J Mol Sci. 2020 Jul
2. Sekhar KR et al. Nucleophosmin Plays a Role in Repairing DNA Damage and Is a Target for Cancer Treatment. Cancer Res. 2023 May
Subcellular Location
Nucleus, nucleolus, nucleoplasm, Cytoplasm, cytoskeleton, microtubule organizing center, centrosome
Western blot analysis of Phospho-Nucleophosmin (T199) on different lysates with Rabbit anti-Phospho-Nucleophosmin (T199) antibody (HA722125) at 1/2,000 dilution.
Lane 1: HeLa cell lysate Lane 2: HeLa treated with 100ng/mL Nocodazole for 17 hours cell lysate Lane 3: HeLa treated with 100ng/mL Nocodazole for 17 hours cell lysate, then the membrane treated with λpp for 1 hour
Lysates/proteins at 15 µg/Lane.
Predicted band size: 33 kDa Observed band size: 38 kDa
Exposure time: 2 seconds; ECL: K1801;
4-20% SDS-PAGE gel.
Proteins were transferred to a PVDF membrane and blocked with 5% NFDM/TBST for 1 hour at room temperature. The primary antibody (HA722125) at 1/2,000 dilution was used in 5% NFDM/TBST at 4℃ overnight. Goat Anti-Rabbit IgG - HRP Secondary Antibody (HA1001) at 1/50,000 dilution was used for 1 hour at room temperature.
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