Summary for Forkhead box protein O3 (NES ID: 64)

Full Name
Forkhead box protein O3     UniProt    
Alternative Names
Forkhead in rhabdomyosarcoma-like 1
AF6q21 protein
FKHRL1
FOXO3A   
Organism
Homo sapiens (Human)    
Experimental Evidence for CRM1-mediated Export
LMB Sensitive Ref.114-3-3 transits to the nucleus and participates in dynamic nucleocytoplasmic transport, Brunet et al., J Cell Biol, 2002
Mutations That Affect Nuclear Export
*highlighted yellow in the full sequence
L369A/M372A/M376A/L378A/L386A/L390A/I394A/L396A Ref.114-3-3 transits to the nucleus and participates in dynamic nucleocytoplasmic transport, Brunet et al., J Cell Biol, 2002
Mutations That Affect CRM1 Binding
Unknown
Functional Export Signals
Undetermined
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 
MAEAPASPAP LSPLEVELDP EFEPQSRPRS CTWPLQRPEL QASPAKPSGE TAADSMIPEE 

        70         80         90        100        110        120 
EDDEDDEDGG GRAGSAMAIG GGGGSGTLGS GLLLEDSARV LAPGGQDPGS GPATAAGGLS 

       130        140        150        160        170        180 
GGTQALLQPQ QPLPPPQPGA AGGSGQPRKC SSRRNAWGNL SYADLITRAI ESSPDKRLTL 

       190        200        210        220        230        240 
SQIYEWMVRC VPYFKDKGDS NSSAGWKNSI RHNLSLHSRF MRVQNEGTGK SSWWIINPDG 

       250        260        270        280        290        300 
GKSGKAPRRR AVSMDNSNKY TKSRGRAAKK KAALQTAPES ADDSPSQLSK WPGSPTSRSS 

       310        320        330        340        350        360 
DELDAWTDFR SRTNSNASTV SGRLSPIMAS TELDEVQDDD APLSPMLYSS SASLSPSVSK 

       370        380        390        400        410        420 
PCTVELPRLT DMAGTMNLND GLTENLMDDL LDNITLPPSQ PSPTGGLMQR SSSFPYTTKG 

       430        440        450        460        470        480 
SGLGSPTSSF NSTVFGPSSL NSLRQSPMQT IQENKPATFS SMSHYGNQTL QDLLTSDSLS 

       490        500        510        520        530        540 
HSDVMMTQSD PLMSQASTAV SAQNSRRNVM LRNDPMMSFA AQPNQGSLVN QNLLHHQHQT 

       550        560        570        580        590        600 
QGALGGSRAL SNSVSNMGLS ESSSLGSAKH QQQSPVSQSM QTLSDSLSGS SLYSTSANLP 

       610        620        630        640        650        660 
VMGHEKFPSD LDLDMFNGSL ECDMESIIRS ELMDADGLDF NFDSLISTQN VVGLNVGNFT 

       670                                                        
GAKQASSQSW VPG
3D Structures in PDB
Not Available
Comments
FKHRL1 belongs to the human Forkhead family, which are proapoptotic transcription factors related to embryogenesis, differentiation, and tumorigenesis. In the absence of growth factor, FKHRL1 is present in the nucleus in an unphosphorylated state. Upon growth factor stimulation, FKHRL1 is phosphorylated by protein kinase Akt at T32 and S253 and exported from the nucleus to the cytoplasm, resulting in the inhibition of target gene transcription. Brunet et al. showed that this relocalization was inhibited by LMB treatment. Two kinds of mutations also prevented FKHRL1 export. One is the mutation of critical hydrophobic in the two putative NES sequences (aa 369-378, aa 386-396). This mutant remains localized in the nucleus even in the presence of growth factor, although they still bind to 14-3-3. The other mutant was generated by substituting the key 14-3-3 binding residues T32 and S253 with alanine. Therefore, both NES and 14-3-3 binding are required for export activity of FKHRL1. The nuclear localization of FKHRL1 is due to a putative NLS at aa 248-250 and 269-271. Mutating the arginines to alanine resulted in cytoplasmic localization even in the absence of growth factor. Binding of 14-3-3 protein to FKHRL1 may mask the NLS and prevent re-entry of the phosphorylated FKHRL1 into the nucleus. They further showed that the phophorylation of FKHRL1 occurs in the nucleus and 14-3-3 also plays role in the export in addition to cytoplasmic retention.
References
[1]. "14-3-3 transits to the nucleus and participates in dynamic nucleocytoplasmic transport"
Brunet, A., Kanai, F., Stehn, J., Xu, J., Sarbassova, D., Frangioni, J.V., Dalal, S.N., DeCaprio, J.A., Greenberg, M.E., Yaffe, M.B. (2002) J Cell Biol, 156:817-828 PubMed
User Input
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