Summary for Hsp70-Ssb1p (NES ID: 29)

Full Name
Heat shock protein SSB1     UniProt    
Alternative Names
Cold-inducible protein YG101   
Organism
Saccharomyces cerevisiae (Baker's yeast)    
Experimental Evidence for CRM1-mediated Export
Mislocalization in Xpo1-1 temperature sensitive strains Ref.1A nuclear export signal prevents Saccharomyces cerevisiae Hsp70 Ssb1p from stimulating nuclear localization signal-directed nuclear transport, Shulga et al., J Biol Chem, 1999
Mutations That Affect Nuclear Export
Unknown
Mutations That Affect CRM1 Binding
Unknown
Functional Export Signals
*shown as underlined residues in the full sequence
574IEAALSDALAALQI587 Ref.1A nuclear export signal prevents Saccharomyces cerevisiae Hsp70 Ssb1p from stimulating nuclear localization signal-directed nuclear transport, Shulga et al., J Biol Chem, 1999
Secondary Structure of Export Signal
Unknown
Other Residues Important for Export
Unknown
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 
MAEGVFQGAI GIDLGTTYSC VATYESSVEI IANEQGNRVT PSFVAFTPEE RLIGDAAKNQ 

        70         80         90        100        110        120 
AALNPRNTVF DAKRLIGRRF DDESVQKDMK TWPFKVIDVD GNPVIEVQYL EETKTFSPQE 

       130        140        150        160        170        180 
ISAMVLTKMK EIAEAKIGKK VEKAVITVPA YFNDAQRQAT KDAGAISGLN VLRIINEPTA 

       190        200        210        220        230        240 
AAIAYGLGAG KSEKERHVLI FDLGGGTFDV SLLHIAGGVY TVKSTSGNTH LGGQDFDTNL 

       250        260        270        280        290        300 
LEHFKAEFKK KTGLDISDDA RALRRLRTAA ERAKRTLSSV TQTTVEVDSL FDGEDFESSL 

       310        320        330        340        350        360 
TRARFEDLNA ALFKSTLEPV EQVLKDAKIS KSQIDEVVLV GGSTRIPKVQ KLLSDFFDGK 

       370        380        390        400        410        420 
QLEKSINPDE AVAYGAAVQG AILTGQSTSD ETKDLLLLDV APLSLGVGMQ GDMFGIVVPR 

       430        440        450        460        470        480 
NTTVPTIKRR TFTTCADNQT TVQFPVYQGE RVNCKENTLL GEFDLKNIPM MPAGEPVLEA 

       490        500        510        520        530        540 
IFEVDANGIL KVTAVEKSTG KSSNITISNA VGRLSSEEIE KMVNQAEEFK AADEAFAKKH 

       550        560        570        580        590        600 
EARQRLESYV ASIEQTVTDP VLSSKLKRGS KSKIEAALSD ALAALQIEDP SADELRKAEV 

       610                                                        
GLKRVVTKAM SSR
3D Structures in PDB
Not Available
Comments
Hsp70 are conserved molecular chaperones that participate in a variety of cellular functions, including protein folding and transport and the repair of stress-induced damage. S. cerevisiae contains two families of cytosolic Hsp70 genes, Ssa, and Ssb. Shulga et al. showed that Ssa1p localize in both the nucleus and cytoplasm. On the other hand, Ssb1p is exclusively cytoplasmic. Then they showed the C-terminus of Ssb1p (aa 546-613) can function autonomously to prevent nuclear localization using GFP-pA reporter protein. They further narrow the NES to aa 574-587 since the sequence, when inserted between LexA and pseudorabies domain of a transcriptional activator, can inhibit the growth of HIS3 on medium lacking histidine. This is supposedly because the activator was exported before it could activate the HIS transcription.
References
[1]. "A nuclear export signal prevents Saccharomyces cerevisiae Hsp70 Ssb1p from stimulating nuclear localization signal-directed nuclear transport"
Shulga, N., James, P., Craig, E.A., Goldfarb, D.S. (1999) J Biol Chem, 274:16501-16507 PubMed
User Input
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