Summary for NPM (NES ID: 93)
Full Name
Nucleophosmin UniProt
Alternative Names
Nucleolar phosphoprotein B23, Numatrin, Nucleolar protein NO38
Organism
Homo sapiens (Human)
Experimental Evidence for CRM1-mediated Export
LMB Sensitive Ref.1Temporal and spatial control of nucleophosmin by the Ran-Crm1 complex in centrosome duplication, Wang et al., Nat Cell Biol, 2005 Ref.3Nucleophosmin is essential for ribosomal protein L5 nuclear export, Yu et al., Mol Cell Biol, 2006
Mutations That Affect Nuclear Export
*highlighted yellow in the full sequence
42LSLRTVSLGAGAKDELHIVE61 by Deletion, L42A/L44A, P97A/L100A, L100A/L102A, 94ITPPVVLRL102 by Deletion Ref.1Temporal and spatial control of nucleophosmin by the Ran-Crm1 complex in centrosome duplication, Wang et al., Nat Cell Biol, 2005 Ref.2Both carboxy-terminus NES motif and mutated tryptophan(s) are crucial for aberrant nuclear export of nucleophosmin leukemic mutants in NPMc+ AML, Falini et al., Blood, 2006 Ref.3Nucleophosmin is essential for ribosomal protein L5 nuclear export, Yu et al., Mol Cell Biol, 2006 Mutations That Affect CRM1 Binding
Unknown
Functional Export Signals
Undetermined
Secondary Structure of Export Signal
β sheets for both NESs
Other Residues Important for Export
Unknown
Sequence
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10 20 30 40 50 60MEDSMDMDMS PLRPQNYLFG CELKADKDYH FKVDNDENEH QLSLRTVSLG AGAKDELHIV70 80 90 100 110 120EAEAMNYEGS PIKVTLATLK MSVQPTVSLG GFEITPPVVL RLKCGSGPVH ISGQHLVAVE130 140 150 160 170 180EDAESEDEEE EDVKLLSISG KRSAPGGGSK VPQKKVKLAA DEDDDDDDEE DDDEDDDDDD190 200 210 220 230 240FDDEEAEEKA PVKKSIRDTP AKNAQKSNQN GKDSKPSSTP RSKGQESFKK QEKTPKTPKG250 260 270 280 290PSSVEDIKAK MQASIEKGGS LPKVEAKFIN YVKNCFRMTD QEAIQDLWQW RKSL
3D Structures in PDB
2P1B (X-Ray,2.75 Å resolution)
Comments
NPM is an abundant phosphoprotein with multifunctions such as ribosomal biogenesis, protein chaperoning, and centrosome duplication. NPM is found mainly in the nucleolus, and capable of shuttling between the nucleus and the cytoplasm. Wang et al. located a N-terminal NES by sequence analysis. They demonstrated LMB treatment, deletion of the putative NES or mutation of the key hydrophobic residues blocks the nucleus-cytoplasmic shuttling ability of NPM. Furthermore, they showed that disruption of CRM1 function by LMB leads to NPM dissociation from centrosomes and a subsequent initiation of premature centrosome duplication. This is in line with the hypothesis that Ran-CRM1 complex negatively regulate the initiation of centrosome duplication, possibly through NES containing protein, like NPM. Yu et al. identified another NES (residue 42-61), whose deletion abolished shuttling.
Doubts about NES: Both NES are quite weak according to Bolli et al. (see reference on NPM mutant, which produce new NES at the C-terminal). Both NESs are buried in PDB. Peptide at 42-61 failed to bind CRM1 in GST-pulldown assay (Chook Lab, unpublished results).
Doubts about NES: Both NES are quite weak according to Bolli et al. (see reference on NPM mutant, which produce new NES at the C-terminal). Both NESs are buried in PDB. Peptide at 42-61 failed to bind CRM1 in GST-pulldown assay (Chook Lab, unpublished results).
References
[1]. "Temporal and spatial control of nucleophosmin by the Ran-Crm1 complex in centrosome duplication"
Wang W, Budhu A, Forgues M, Wang XW. (2005) Nat Cell Biol, 7:823-830 PubMed
[2]. "Both carboxy-terminus NES motif and mutated tryptophan(s) are crucial for aberrant nuclear export of nucleophosmin leukemic mutants in NPMc+ AML"
Falini B. et al. (2006) Blood, 107:4514-4523 PubMed
[3]. "Nucleophosmin is essential for ribosomal protein L5 nuclear export"
Yu Y, Maggi LB Jr, Brady SN, Apicelli AJ, Dai MS, Lu H, Weber JD. (2006) Mol Cell Biol, 26:3798-3809 PubMed
Wang W, Budhu A, Forgues M, Wang XW. (2005) Nat Cell Biol, 7:823-830 PubMed
[2]. "Both carboxy-terminus NES motif and mutated tryptophan(s) are crucial for aberrant nuclear export of nucleophosmin leukemic mutants in NPMc+ AML"
Falini B. et al. (2006) Blood, 107:4514-4523 PubMed
[3]. "Nucleophosmin is essential for ribosomal protein L5 nuclear export"
Yu Y, Maggi LB Jr, Brady SN, Apicelli AJ, Dai MS, Lu H, Weber JD. (2006) Mol Cell Biol, 26:3798-3809 PubMed
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