Summary for hRpf1/Nedd4 (NES ID: 44)

Full Name
E3 ubiquitin-protein ligase NEDD4     UniProt    
Alternative Names
Neural precursor cell expressed developmentally down-regulated protein 4 (Nedd4)   
Organism
Homo sapiens (Human)    
Experimental Evidence for CRM1-mediated Export
LMB Sensitive Ref.1Nuclear import/export of hRPF1/Nedd4 regulates the ubiquitin-dependent degradation of its nuclear substrates, Hamilton et al., J Biol Chem, 2001
Mutations That Affect Nuclear Export
*highlighted yellow in the full sequence
L305A/I307A Ref.1Nuclear import/export of hRPF1/Nedd4 regulates the ubiquitin-dependent degradation of its nuclear substrates, Hamilton et al., J Biol Chem, 2001
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 
MATCAVEVFG LLEDEENSRI VRVRVIAGIG LAKKDILGAS DPYVRVTLYD PMNGVLTSVQ 

        70         80         90        100        110        120 
TKTIKKSLNP KWNEEILFRV HPQQHRLLFE VFDENRLTRD DFLGQVDVPL YPLPTENPRL 

       130        140        150        160        170        180 
ERPYTFKDFV LHPRSHKSRV KGYLRLKMTY LPKTSGSEDD NAEQAEELEP GWVVLDQPDA 

       190        200        210        220        230        240 
ACHLQQQQEP SPLPPGWEER QDILGRTYYV NHESRRTQWK RPTPQDNLTD AENGNIQLQA 

       250        260        270        280        290        300 
QRAFTTRRQI SEETESVDNR ESSENWEIIR EDEATMYSNQ AFPSPPPSSN LDVPTHLAEE 

       310        320        330        340        350        360 
LNARLTIFGN SAVSQPASSS NHSSRRGSLQ AYTFEEQPTL PVLLPTSSGL PPGWEEKQDE 

       370        380        390        400        410        420 
RGRSYYVDHN SRTTTWTKPT VQATVETSQL TSSQSSAGPQ SQASTSDSGQ QVTQPSEIEQ 

       430        440        450        460        470        480 
GFLPKGWEVR HAPNGRPFFI DHNTKTTTWE DPRLKIPAHL RGKTSLDTSN DLGPLPPGWE 

       490        500        510        520        530        540 
ERTHTDGRIF YINHNIKRTQ WEDPRLENVA ITGPAVPYSR DYKRKYEFFR RKLKKQNDIP 

       550        560        570        580        590        600 
NKFEMKLRRA TVLEDSYRRI MGVKRADFLK ARLWIEFDGE KGLDYGGVAR EWFFLISKEM 

       610        620        630        640        650        660 
FNPYYGLFEY SATDNYTLQI NPNSGLCNED HLSYFKFIGR VAGMAVYHGK LLDGFFIRPF 

       670        680        690        700        710        720 
YKMMLHKPIT LHDMESVDSE YYNSLRWILE NDPTELDLRF IIDEELFGQT HQHELKNGGS 

       730        740        750        760        770        780 
EIVVTNKNKK EYIYLVIQWR FVNRIQKQMA AFKEGFFELI PQDLIKIFDE NELELLMCGL 

       790        800        810        820        830        840 
GDVDVNDWRE HTKYKNGYSA NHQVIQWFWK AVLMMDSEKR IRLLQFVTGT SRVPMNGFAE 

       850        860        870        880        890        900 
LYGSNGPQSF TVEQWGTPEK LPRAHTCFNR LDLPPYESFE ELWDKLQMAI ENTQGFDGVD
3D Structures in PDB
Not Available
Comments
Nedd4 is a E3 ubiquitin ligase enzyme, containing a C2/CaLB domain at the N-terimnal, a WW protein-protein interaction domain, followed by a conserved hect domain, which is responsible for catalytic action. Huacani et al. was working to identify a substrate for Nedd4. They found a proline-rich protein, named hPRTB, is a potential candidate. They showed that hPRTB is a substrate of E3 ligases in virto, and Nedd4 regulates the stability of hPRTB in cells. Since hPRTB colocalizes with splicing factors in nuclear speckles and Nedd4 is mainly cytoplasmic, Nedd4 must be able to enter and exit the nucleus. Nedd4 was reported to contain a bipartite NLS between aa 534-550. Huacani et al. used a series of deletion constructs to map the sequence responsible for its cytoplasmic localization. They found that aa 393-409 is required. Mutations L405A/I307A significantly increased hte nuclear presence of Nedd4, so does LMB treatment. Note that the sequence in the SwissProt for human Nedd4 is 100 aa longer in the N-terminus than the numbering in the paper.
References
[1]. "Nuclear import/export of hRPF1/Nedd4 regulates the ubiquitin-dependent degradation of its nuclear substrates"
Hamilton, M.H., Tcherepanova, I., Huibregtse, J.M., McDonnell, D.P. (2001) J Biol Chem, 276:26324-26331 PubMed
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