Summary for RapGEF1 (NES ID: 277)

Full Name
Rap guanine nucleotide exchange factor 1     UniProt    
Alternative Names
C3G, CRK SH3-binding GNRP, Guanine nucleotide-releasing factor 2   
Organism
Homo sapiens (Human)    
Experimental Evidence for CRM1-mediated Export
LMB Sensitive Ref.1C3G shows regulated nucleocytoplasmic exchange and represses histone modifications associated with euchromatin, Shakyawar et al., Mol Biol Cell, 2017
Mutations That Affect Nuclear Export
*highlighted yellow in the full sequence
L779A/L781A Ref.1C3G shows regulated nucleocytoplasmic exchange and represses histone modifications associated with euchromatin, Shakyawar et al., Mol Biol Cell, 2017
Mutations That Affect CRM1 Binding
Unknown
Functional Export Signals
*shown as underlined residues in the full sequence
776EEILKLLMELVFRLVC791 Ref.1C3G shows regulated nucleocytoplasmic exchange and represses histone modifications associated with euchromatin, Shakyawar et al., Mol Biol Cell, 2017
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 
MDTDSQRSHL SSFTMKLMDK FHSPKIKRTP SKKGKPAEVS VKIPEKPVNK EATDRFLPEG 

        70         80         90        100        110        120 
YPLPLDLEQQ AVEFMSTSAV ASRSQRQKNL SWLEEKEKEV VSALRYFKTI VDKMAIDKKV 

       130        140        150        160        170        180 
LEMLPGSASK VLEAILPLVQ NDPRIQHSSA LSSCYSRVYQ SLANLIRWSD QVMLEGVNSE 

       190        200        210        220        230        240 
DKEMVTTVKG VIKAVLDGVK ELVRLTIEKQ GRPSPTSPVK PSSPASKPDG PAELPLTDRE 

       250        260        270        280        290        300 
VEILNKTTGM SQSTELLPDA TDEEVAPPKP PLPGIRVVDN SPPPALPPKK RQSAPSPTRV 

       310        320        330        340        350        360 
AVVAPMSRAT SGSSLPVGIN RQDFDVDCYA QRRLSGGSHS YGGESPRLSP CSSIGKLSKS 

       370        380        390        400        410        420 
DEQLSSLDRD SGQCSRNTSC ETLDHYDPDY EFLQQDLSNA DQIPQQTAWN LSPLPESLGE 

       430        440        450        460        470        480 
SGSPFLGPPF QLPLGGHPQP DGPLAPGQQT DTPPALPEKK RRSAASQTAD GSGCRVSYER 

       490        500        510        520        530        540 
HPSQYDNISG EDLQSTAPIP SVPYAPFAAI LPFQHGGSSA PVEFVGDFTA PESTGDPEKP 

       550        560        570        580        590        600 
PPLPEKKNKH MLAYMQLLED YSEPQPSMFY QTPQNEHIYQ QKNKLLMEVY GFSDSFSGVD 

       610        620        630        640        650        660 
SVQELAPPPA LPPKQRQLEP PAGKDGHPRD PSAVSGVPGK DSRDGSERAP KSPDALESAQ 

       670        680        690        700        710        720 
SEEEVDELSL IDHNEIMSRL TLKQEGDDGP DVRGGSGDIL LVHATETDRK DLVLYCEAFL 

       730        740        750        760        770        780 
TTYRTFISPE ELIKKLQYRY EKFSPFADTF KKRVSKNTFF VLVRVVDELC LVELTEEILK 

       790        800        810        820        830        840 
LLMELVFRLV CNGELSLARV LRKNILDKVD QKKLLRCATS SQPLAARGVA ARPGTLHDFH 

       850        860        870        880        890        900 
SHEIAEQLTL LDAELFYKIE IPEVLLWAKE QNEEKSPNLT QFTEHFNNMS YWVRSIIMLQ 

       910        920        930        940        950        960 
EKAQDRERLL LKFIKIMKHL RKLNNFNSYL AILSALDSAP IRRLEWQKQT SEGLAEYCTL 

       970        980        990       1000       1010       1020 
IDSSSSFRAY RAALSEVEPP CIPYLGLILQ DLTFVHLGNP DYIDGKVNFS KRWQQFNILD 

      1030       1040       1050       1060       1070            
SMRCFQQAHY DMRRNDDIIN FFNDFSDHLA EEALWELSLK IKPRNITRRK TDREEKT
3D Structures in PDB
5L23 (X-Ray,1.77 Å resolution)
Comments
RapGEF1 is a Guanine nucleotide-releasing protein for the Ras family GTPases. It is primarily cytoplasmic, but Shakyawar et al. showed that it can be found in the nucleus and identified two NLSs. Deletion analysis mapped an NES to the N-terminal portion of the catalytic domain. The full-length protein is only weakly responsive to LMB, but the moderate change can be abrogated by the dual leucine mutation in the putative NES. The peptide itself can direct GFP's nuclear exit efficiently in a LMB-sensitive manner, however the sequence contains an excess of hydrophobic residues uncharacteristic of functional NESs. Homology model based on RAS guanyl-releasing protein 1 showed the putative NES as a helix in a double helical pair, possibly inaccessible to CRM1.
References
[1]. "C3G shows regulated nucleocytoplasmic exchange and represses histone modifications associated with euchromatin"
Shakyawar DK, Dayma K, Ramadhas A, Varalakshmi C, Radha V. (2017) Mol Biol Cell, 28(7):984-995 PubMed
User Input
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