Summary for Actinin-4 (NES ID: 227)

Full Name
Alpha-actinin-4     UniProt    
Alternative Names
F-actin cross-linking protein
Non-muscle alpha-actinin 4   
Organism
Homo sapiens (Human)    
Experimental Evidence for CRM1-mediated Export
LMB Sensitive Ref.1Molecular mechanisms underlying nucleocytoplasmic shuttling of actinin-4., Kumeta et al., J Cell Sci, 2010
Mutations That Affect Nuclear Export
Unknown
Mutations That Affect CRM1 Binding
Unknown
Functional Export Signals
*shown as underlined residues in the full sequence
141MTLGMIWTIIL151 Ref.1Molecular mechanisms underlying nucleocytoplasmic shuttling of actinin-4., Kumeta et al., J Cell Sci, 2010
Secondary Structure of Export Signal
the end of a short α-helix
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 
MVDYHAANQS YQYGPSSAGN GAGGGGSMGD YMAQEDDWDR DLLLDPAWEK QQRKTFTAWC 

        70         80         90        100        110        120 
NSHLRKAGTQ IENIDEDFRD GLKLMLLLEV ISGERLPKPE RGKMRVHKIN NVNKALDFIA 

       130        140        150        160        170        180 
SKGVKLVSIG AEEIVDGNAK MTLGMIWTII LRFAIQDISV EETSAKEGLL LWCQRKTAPY 

       190        200        210        220        230        240 
KNVNVQNFHI SWKDGLAFNA LIHRHRPELI EYDKLRKDDP VTNLNNAFEV AEKYLDIPKM 

       250        260        270        280        290        300 
LDAEDIVNTA RPDEKAIMTY VSSFYHAFSG AQKAETAANR ICKVLAVNQE NEHLMEDYEK 

       310        320        330        340        350        360 
LASDLLEWIR RTIPWLEDRV PQKTIQEMQQ KLEDFRDYRR VHKPPKVQEK CQLEINFNTL 

       370        380        390        400        410        420 
QTKLRLSNRP AFMPSEGKMV SDINNGWQHL EQAEKGYEEW LLNEIRRLER LDHLAEKFRQ 

       430        440        450        460        470        480 
KASIHEAWTD GKEAMLKHRD YETATLSDIK ALIRKHEAFE SDLAAHQDRV EQIAAIAQEL 

       490        500        510        520        530        540 
NELDYYDSHN VNTRCQKICD QWDALGSLTH SRREALEKTE KQLEAIDQLH LEYAKRAAPF 

       550        560        570        580        590        600 
NNWMESAMED LQDMFIVHTI EEIEGLISAH DQFKSTLPDA DREREAILAI HKEAQRIAES 

       610        620        630        640        650        660 
NHIKLSGSNP YTTVTPQIIN SKWEKVQQLV PKRDHALLEE QSKQQSNEHL RRQFASQANV 

       670        680        690        700        710        720 
VGPWIQTKME EIGRISIEMN GTLEDQLSHL KQYERSIVDY KPNLDLLEQQ HQLIQEALIF 

       730        740        750        760        770        780 
DNKHTNYTME HIRVGWEQLL TTIARTINEV ENQILTRDAK GISQEQMQEF RASFNHFDKD 

       790        800        810        820        830        840 
HGGALGPEEF KACLISLGYD VENDRQGEAE FNRIMSLVDP NHSGLVTFQA FIDFMSRETT 

       850        860        870        880        890        900 
DTDTADQVIA SFKVLAGDKN FITAEELRRE LPPDQAEYCI ARMAPYQGPD AVPGALDYKS 

       910                                                        
FSTALYGESD L
3D Structures in PDB
1WLX (NMR)
1YDI (X-Ray,1.80 Å resolution)
2R0O (X-Ray,2.20 Å resolution)
Comments
α-actinin is a cross-linking protein that bundles actin filaments. It resembles the spectrin superfamily with its four spectrin repeats. There exist four isoforms of α-actinin. Actinin-2 and actinic-3 are muscle cells specific, while actinin-1 and actinin-4 are ubiquitous. Despite the high sequence similarity, actinin-1 and actinin-4 behave differently. In particular, actinin-4 localizes to the nucleus upon inhibition of phosphoinositide 3-kinase or actin depolymerization in serval cancer cell lines. Kumeta et al. demonstrated that actinic-4 is a nucleocytoplasmic shuttling protein. The export process is CRM1-dependent. Since actinin-4 (152-758) is nuclear and actinin-4 (141-758) is cytoplasmic, the functional NES is deemed to be aa 141-151. Interestingly, the import of actinin-4 is independent of importins. Kumeta et al. proposed that the inner spectrin repeats mediates the import through direct interaction with nuclear pore.
References
[1]. "Molecular mechanisms underlying nucleocytoplasmic shuttling of actinin-4."
Kumeta M, Yoshimura SH, Harata M, Takeyasu K. (2010) J Cell Sci, 123:1020-30 PubMed
User Input
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