Summary for SNUPN (NES ID: 1)

Full Name
Snurportin 1     UniProt    
Alternative Names
SPN1   
Organism
Homo sapiens (Human)    
Experimental Evidence for CRM1-mediated Export
LMB Sensitive,  Binds CRM1,  Mislocalization in Xpo1-1 temperature sensitive strains Ref.1Structural Basis for Leucine-rich Nuclear Export Signal Recognition by CRM1, Dong et al., Nature, 2009
Mutations That Affect Nuclear Export
*highlighted yellow in the full sequence
L4A/L8A Ref.1Structural Basis for Leucine-rich Nuclear Export Signal Recognition by CRM1, Dong et al., Nature, 2009
Mutations That Affect CRM1 Binding
*shown as red residues in the full sequence
L4A/L8A, E2A/E3A/S11A Ref.1Structural Basis for Leucine-rich Nuclear Export Signal Recognition by CRM1, Dong et al., Nature, 2009
Functional Export Signals
*shown as underlined residues in the full sequence
1MEELSQALASSFSVS15 Ref.1Structural Basis for Leucine-rich Nuclear Export Signal Recognition by CRM1, Dong et al., Nature, 2009 Ref.2CRM1-mediated Recycling of Snurportin 1 to the Cytoplasm, Paraskeva et al., J Cell Biol, 1999
Secondary Structure of Export Signal
α-helix (residues 1-10) followed by an extended conformation (residues 11-14) Ref.1Structural Basis for Leucine-rich Nuclear Export Signal Recognition by CRM1, Dong et al., Nature, 2009
Other Residues Important for Export
*shown as green residues in the full sequence
126VGK128, 143TKSGYCVN150, R278, 178EVNQ181, 221KTKLNPF227 Ref.1Structural Basis for Leucine-rich Nuclear Export Signal Recognition by CRM1, Dong et al., Nature, 2009
Sequence
Show FASTA Format Show Domain Info by CDD Show Secondary Structure by PSIPRED Show Conservation Score by AL2CO 
        10         20         30         40         50         60 
MEELSQALAS SFSVSQDLNS TAAPHPRLSQ YKSKYSSLEQ SERRRRLLEL QKSKRLDYVN 

        70         80         90        100        110        120 
HARRLAEDDW TGMESEEENK KDDEEMDIDT VKKLPKHYAN QLMLSEWLID VPSDLGQEWI 

       130        140        150        160        170        180 
VVVCPVGKRA LIVASRGSTS AYTKSGYCVN RFSSLLPGGN RRNSTAKDYT ILDCIYNEVN 

       190        200        210        220        230        240 
QTYYVLDVMC WRGHPFYDCQ TDFRFYWMHS KLPEEEGLGE KTKLNPFKFV GLKNFPCTPE 

       250        260        270        280        290        300 
SLCDVLSMDF PFEVDGLLFY HKQTHYSPGS TPLVGWLRPY MVSDVLGVAV PAGPLTTKPD 

       310        320        330        340        350        360 
YAGHQLQQIM EHKKSQKEGM KEKLTHKASE NGHYELEHLS TPKLKGSSHS PDHPGCLMEN
3D Structures in PDB
3GB8 (X-Ray,2.9 Å resolution)
3GJX (X-Ray,2.50 Å resolution)
Comments
SNUPN imports spliceosomal U snRNPs into the nucleus by binding the trimethylguanosine cap of snRNA and Importin β. It contains an N-terminal Importin β-binding domain (IBB) and a C-terminal nucleotide-binding domain (NBD). SNUPN is recycled back to the cytoplasm by CRM1. Dong et al. showed that residues 1-15 is a functional NES by transport competition assays, where reporter protein SV40 NLS-GFP-GFP-SNUPN(1-15) is targeted to the cytoplasm even though SV40 NLS-GFP-GFP is nuclear. Mutation of L4 and L8 to alanine abolished the nuclear export of full length SNUPN.
References
[1]. "Structural Basis for Leucine-rich Nuclear Export Signal Recognition by CRM1"
Dong, X., Biswas, A., Süel, K., Jackson, L., Martines, R., Gu, H., Chook, Y.M. (2009) Nature, Published Online: PubMed
[2]. "CRM1-mediated Recycling of Snurportin 1 to the Cytoplasm"
Paraskeva, E., Izaurralde, E., Bischoff, F., Huber, J., Kutay, U., Hartmann E., Lührmann, R., and Görlich, D. (1999) J Cell Biol, 145:255-264 PubMed
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