Summary for NPM mutants (NES ID: 94)
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.1Both 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.2Born to be exported: COOH-terminal nuclear export signals of different strength ensure cytoplasmic accumulation of nucleophosmin leukemic mutants, Bolli et al., Cancer Res, 2007
Mutations That Affect Nuclear Export
*highlighted yellow in the full sequence
L289A/V291A/V294A Ref.1Both 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 Mutations That Affect CRM1 Binding
Unknown
Functional Export Signals
*shown as underlined residues in the full sequence
286DLCLAVEEVSL296 Ref.2Born to be exported: COOH-terminal nuclear export signals of different strength ensure cytoplasmic accumulation of nucleophosmin leukemic mutants, Bolli et al., Cancer Res, 2007 Secondary Structure of Export Signal
α-helix (residues 281-293)
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 QEAIQDLCLA VEEVSLRK
3D Structures in PDB
Not Available
Comments
Frameshift mutation at exon 12 of NPM is one of the most frequent mutation in acute myeloid leukemia patients with a normal karyotye. There are eight novel variants identified so far and all of these mutants gained an NES motif. The one given in the sequence is the most common variant, whose NES motif follows the L-xxx-V-xx-V-x-L pattern, with loss of both tryptophan 288 and 290, which are the putative nucleolus localization signal. Another type of mutant follows the L-xxx-L-xx-V-x-L pattern and were only found when W288 is retained (one example is DLWQSLAQVSLR). Both NES motif were capable of replacing the export function of the Rev protein. However, the second motif (with W288 retained) is a stronger NES.
References
[1]. "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
[2]. "Born to be exported: COOH-terminal nuclear export signals of different strength ensure cytoplasmic accumulation of nucleophosmin leukemic mutants"
Bolli N. et al. (2007) Cancer Res, 67:6230-6237 PubMed
Falini B. et al. (2006) Blood, 107:4514-4523 PubMed
[2]. "Born to be exported: COOH-terminal nuclear export signals of different strength ensure cytoplasmic accumulation of nucleophosmin leukemic mutants"
Bolli N. et al. (2007) Cancer Res, 67:6230-6237 PubMed
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