Summary for Hsc70/Hsc54 (NES ID: 67)

Full Name
Heat shock cognate 71 kDa protein (Isoform 2)     UniProt    
Alternative Names
Heat shock 70 kDa protein 8   
Organism
Homo sapiens (Human)    
Experimental Evidence for CRM1-mediated Export
LMB Sensitive Ref.1Identification of novel nuclear export and nuclear localization-related signals in human heat shock cognate protein 70., Tsukahara et al., J Biol Chem, 2004
Mutations That Affect Nuclear Export
*highlighted yellow in the full sequence
L394A, V396A, L399A, L401A Ref.1Identification of novel nuclear export and nuclear localization-related signals in human heat shock cognate protein 70., Tsukahara et al., J Biol Chem, 2004
Mutations That Affect CRM1 Binding
Unknown
Functional Export Signals
Undetermined
Secondary Structure of Export Signal
loop
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 
MSKGPAVGID LGTTYSCVGV FQHGKVEIIA NDQGNRTTPS YVAFTDTERL IGDAAKNQVA 

        70         80         90        100        110        120 
MNPTNTVFDA KRLIGRRFDD AVVQSDMKHW PFMVVNDAGR PKVQVEYKGE TKSFYPEEVS 

       130        140        150        160        170        180 
SMVLTKMKEI AEAYLGKTVT NAVVTVPAYF NDSQRQATKD AGTIAGLNVL RIINEPTAAA 

       190        200        210        220        230        240 
IAYGLDKKVG AERNVLIFDL GGGTFDVSIL TIEDGIFEVK STAGDTHLGG EDFDNRMVNH 

       250        260        270        280        290        300 
FIAEFKRKHK KDISENKRAV RRLRTACERA KRTLSSSTQA SIEIDSLYEG IDFYTSITRA 

       310        320        330        340        350        360 
RFEELNADLF RGTLDPVEKA LRDAKLDKSQ IHDIVLVGGS TRIPKIQKLL QDFFNGKELN 

       370        380        390        400        410        420 
KSINPDEAVA YGAAVQAAIL SGDKSENVQD LLLLDVTPLS LGIETAGGVM TVLIKRNTTI 

       430        440        450        460        470        480 
PTKQTQTFTT YSDNQPGVLI QVYEGERAMT KDNNLLGKFE LTGMPGGMPG GFPGGGAPPS 

       490                                                        
GGASSGPTIE EVD
3D Structures in PDB
3C7N (X-Ray,3.12 Å resolution)
Comments
Hsc70 is a member of the heat shock protein 70 (Hsp70) family. Although human Hsc70 and the one from S. cerevisiae (Hsp70-Ssb1p) are homologs, the NES identified in Hsp70-Ssb1p is not present in Hsc70 of human. Tsukahara et al. reported that Hsc54, an isoform of human Hsc70, is exclusively cytoplasmic and remain so under heat shock. However, LMB treatment or mutation of key hydrophobic residues induces nuclear accumulation. The proposed NES is conserved in Hsp70-Ssb1p (different from the one already identified in Hsp70-Ssb1p). In contrast, the localization of full length hHsc70 was not affected by LMB treatment or mutation of hydrophobics (maybe the NES is masked by some other sequences present only in full-length Hsc70?)
References
[1]. "Identification of novel nuclear export and nuclear localization-related signals in human heat shock cognate protein 70."
Tsukahara F, Maru Y (2004) J Biol Chem, 279:8867-72 PubMed
User Input
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