Summary for Cyclin B1 (NES ID: 9)

Full Name
G2/mitotic-specific cyclin-B1     UniProt    
Alternative Names
None
Organism
Xenopus laevis (African clawed frog)    
Experimental Evidence for CRM1-mediated Export
LMB Sensitive,  Binds CRM1 Ref.1Control of cyclin B1 localization through regulated binding of the nuclear export factor CRM1, Yang et al., Genes Dev, 1998
Mutations That Affect Nuclear Export
*highlighted yellow in the full sequence
F112A Ref.1Control of cyclin B1 localization through regulated binding of the nuclear export factor CRM1, Yang et al., Genes Dev, 1998
Mutations That Affect CRM1 Binding
*shown as red residues in the full sequence
F112A Ref.1Control of cyclin B1 localization through regulated binding of the nuclear export factor CRM1, Yang et al., Genes Dev, 1998
Functional Export Signals
*shown as underlined residues in the full sequence
76LKVIEENVCPKPAQVEPSSPSPMETSGCLPDELCQAFSDVLIHVKDVDAD125 Ref.1Control of cyclin B1 localization through regulated binding of the nuclear export factor CRM1, Yang et al., Genes Dev, 1998
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 
MSLRVTRNML ANAENNVKTT LAGKRVVATK PGLRPRTALG DIGNKAEVKV PTKKELKPAV 

        70         80         90        100        110        120 
KAAKKAKPVD KLLEPLKVIE ENVCPKPAQV EPSSPSPMET SGCLPDELCQ AFSDVLIHVK 

       130        140        150        160        170        180 
DVDADDDGNP MLCSEYVKDI YAYLRSLEDA QAVRQNYLHG QEVTGNMRAI LIDWLVQVQM 

       190        200        210        220        230        240 
KFRLLQETMF MTVGIIDRFL QEHPVPKNQL QLVGVTAMFL AAKYEEMYPP EIGDFTFVTD 

       250        260        270        280        290        300 
HTYTKAQIRD MEMKILRVLK FAIGRPLPLH FLRRASKIGE VTAEQHSLAK YLMELVMVDY 

       310        320        330        340        350        360 
DMVHFTPSQI AAASSCLSLK ILNAGDWTPT LHHYMAYSEE DLVPVMQHMA KNIIKVNKGL 

       370        380        390                                  
TKHLTVKNKY ASSKQMKIST IPQLRSDVVV EMARPLM
3D Structures in PDB
Not Available
Comments
Cyclin B1/Cdc2 complex is critical for regulating cell mitosis. Cyclin B1 translocates from the cytoplasm to the nucleus at the onset of mitosis. It was previously found that there is a domain of Cyclin B1 (called CRS) in human that was sufficient for its cytoplasmic localization. In Xenopus, the CRS of Cyclin B1 is 61% identical to human. Yang et al. demonstrated through nuclear injection and cell contents analysis that Cyclin B1 is predominantly cytoplasmic. Cyclin B1 is actively transported out of the nucleus, and the process requires RanGTP. They further showed that aa 76-125, when fused with GST, can export the fusion protein out of the nucleus. The export is sensitive to LMB. Mutation of F112 to alanine abort both in vivo export and in vitro CRM1 binding. In addition, CRS contains four serine phosphorylation site, which are important for Cyclin B1 nuclear accumulation. Yang et al. showed that mutation of serines to Glu, which mimics constitutive phosphorylation, reduces the affinity of Cyclin B1 for CRM1.
References
[1]. "Control of cyclin B1 localization through regulated binding of the nuclear export factor CRM1"
Yang, J., Bardes, E.S., Moore, J.D., Brennan, J., Powers, M.A., Kornbluth, S. (1998) Genes Dev, 12:2131-2143 PubMed
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