Summary for Ubx (NES ID: 394)

Full Name
Homeotic protein Ultrabithorax     UniProt    
Alternative Names
None
Organism
Drosophila melanogaster (Fruit fly)    
Experimental Evidence for CRM1-mediated Export
Binds CRM1,  Reporter activity when co-expressed with CRM1 Ref.1Role of a versatile peptide motif controlling Hox nuclear export and autophagy in the Drosophila fat body, Duffraisse et al., J Cell Sci, 2020
Mutations That Affect Nuclear Export
*highlighted yellow in the full sequence
I245A/I249A/L253A, P241A/W242A/M243A Ref.1Role of a versatile peptide motif controlling Hox nuclear export and autophagy in the Drosophila fat body, Duffraisse et al., J Cell Sci, 2020
Mutations That Affect CRM1 Binding
*shown as red residues in the full sequence
I245A/I249A/L253A Ref.1Role of a versatile peptide motif controlling Hox nuclear export and autophagy in the Drosophila fat body, Duffraisse et al., J Cell Sci, 2020
Functional Export Signals
*shown as underlined residues in the full sequence
242WMAIAGKIRSDL253 Ref.1Role of a versatile peptide motif controlling Hox nuclear export and autophagy in the Drosophila fat body, Duffraisse et al., J Cell Sci, 2020
Secondary Structure of Export Signal
Partially 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 
MNSYFEQASG FYGHPHQATG MAMGSGGHHD QTASAAAAAY RGFPLSLGMS PYANHHLQRT 

        70         80         90        100        110        120 
TQDSPYDASI TAACNKIYGD GAGAYKQDCL NIKADAVNGY KDIWNTGGSN GGGGGGGGGG 

       130        140        150        160        170        180 
GGGAGGTGGA GNANGGNAAN ANGQNNPAGG MPVRPSACTP DSRVGGYLDT SGGSPVSHRG 

       190        200        210        220        230        240 
GSAGGNVSVS GGNGNAGGVQ SGVGVAGAGT AWNANCTISG AAAQTAAASS LHQASNHTFY 

       250        260        270        280        290        300 
PWMAIAGKIR SDLTQYGGIS TDMGKRYSES LAGSLLPDWL GTNGLRRRGR QTYTRYQTLE 

       310        320        330        340        350        360 
LEKEFHTNHY LTRRRRIEMA HALCLTERQI KIWFQNRRMK LKKEIQAIKE LNEQEKQAQA 

       370        380                                             
QKAAAAAAAA AAVQGGHLDQ
3D Structures in PDB
4CYC (X-ray,2.36 Å resolution)
Comments
Ubx is a homeodomain-containing transcription factor found predominantly in the nucleus protein where it functions to repress autophagy. Duffraisse et al. found that N-terminal deletion causes cytoplasmic accumulation of Ubx through action of a reverse NES in isoform IA at the end of the W-containing HEX motif (boundary noted in entry may be incorrect as the paper did not clearly mention the residues tested as autonomous NES - sequence displayed is from Scr). HEX motif is known to be critical for binding to co-factors for DNA-binding. Mutations to the NES caused increase nuclear accumulation of Ubx full-length and N-terminally truncated protein. Interaction with drosophila CRM1 Embargoed is illustrated by biomolecular fluorescence complementation and in vitro pull-downs, where NES and HEX mutations affected the observed interaction. Co-expression of Embargo caused cytoplasmic accumulation of Ubx. Genetic ablation of Emb also caused nuclear retention of Ubx at the L3-W stage, when Ubx is normally excluded from the nucleus. The paper also concluded that Emb-mediated Ubx export leads to degradation during L3-F to L3-W transition and that the NES may be masked in L3-F due to acetylation. Similar NESs identified in the same paper for different homeobox proteins are in entries 395-397. Ref.1Role of a versatile peptide motif controlling Hox nuclear export and autophagy in the Drosophila fat body, Duffraisse et al., J Cell Sci, 2020
References
[1]. "Role of a versatile peptide motif controlling Hox nuclear export and autophagy in the Drosophila fat body"
Duffraisse M, Paul R, Carnesecchi J, Hudry B, Banreti A, Reboulet J, Ajuria L, Lohmann I, Merabet S. (2020) J Cell Sci, 133(18):jcs241943 PubMed
User Input
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