Summary for HIF-2α (NES ID: 286)
Full Name
Hypoxia inducible factor 2α UniProt
Alternative Names
Endothelial PAS domain-containing protein 1 (EPAS1)
Organism
Homo sapiens (Human)
Experimental Evidence for CRM1-mediated Export
Mutations That Affect Nuclear Export
*highlighted yellow in the full sequence
L662A/L667A Ref.1ERK1/2 phosphorylates HIF-2α and regulates its activity by controlling its CRM1-dependent nuclear shuttling, Gkotinakou et al., J Cell Sci, 2019 Mutations That Affect CRM1 Binding
Unknown
Functional Export Signals
Undetermined
Secondary Structure of Export Signal
Unknown
Other Residues Important for Export
*shown as green residues in the full sequence
S672 Sequence
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10 20 30 40 50 60MTADKEKKRS SSERRKEKSR DAARCRRSKE TEVFYELAHE LPLPHSVSSH LDKASIMRLA70 80 90 100 110 120ISFLRTHKLL SSVCSENESE AEADQQMDNL YLKALEGFIA VVTQDGDMIF LSENISKFMG130 140 150 160 170 180LTQVELTGHS IFDFTHPCDH EEIRENLSLK NGSGFGKKSK DMSTERDFFM RMKCTVTNRG190 200 210 220 230 240RTVNLKSATW KVLHCTGQVK VYNNCPPHNS LCGYKEPLLS CLIIMCEPIQ HPSHMDIPLD250 260 270 280 290 300SKTFLSRHSM DMKFTYCDDR ITELIGYHPE ELLGRSAYEF YHALDSENMT KSHQNLCTKG310 320 330 340 350 360QVVSGQYRML AKHGGYVWLE TQGTVIYNPR NLQPQCIMCV NYVLSEIEKN DVVFSMDQTE370 380 390 400 410 420SLFKPHLMAM NSIFDSSGKG AVSEKSNFLF TKLKEEPEEL AQLAPTPGDA IISLDFGNQN430 440 450 460 470 480FEESSAYGKA ILPPSQPWAT ELRSHSTQSE AGSLPAFTVP QAAAPGSTTP SATSSSSSCS490 500 510 520 530 540TPNSPEDYYT SLDNDLKIEV IEKLFAMDTE AKDQCSTQTD FNELDLETLA PYIPMDGEDF550 560 570 580 590 600QLSPICPEER LLAENPQSTP QHCFSAMTNI FQPLAPVAPH SPFLLDKFQQ QLESKKTEPE610 620 630 640 650 660HRPMSSIFFD AGSKASLPPC CGQASTPLSS MGGRSNTQWP PDPPLHFGPT KWAVGDQRTE670 680 690 700 710 720FLGAAPLGPP VSPPHVSTFK TRSAKGFGAR GPDVLSPAMV ALSNKLKLKR QLEYEEQAFQ730 740 750 760 770 780DLSGGDPPGG STSHLMWKRM KNLRGGSCPL MPDKPLSANV PNDKFTQNPM RGLGHPLRHL790 800 810 820 830 840PLPQPPSAIS PGENSKSRFP PQCYATQYQD YSLSSAHKVS GMASRLLGPS FESYLLPELT850 860 870RYDCEVNVPV LGSSTLLQGG DLLRALDQAT
3D Structures in PDB
Comments
In hypoxia conditions, HIF-2α is phosphorylated at Ser672 by ERK1 and ERK2 and localizes to the nucleus. When phosphorylation by ERK1 and ERK2 is prevented, HIF-2α mislocalizes to the cytoplasm, decreasing transcriptional activity of HIF-2α. Mutation of Ser672 to alanine mislocalizes HIF-2α to the cytoplasm, and LMB reverts it back to the nucleus. CRM1 was found by IP to interact with HIF-2α S672A and with the WT protein in cells treated with ERK inhibitor U0126, suggesting that CRM1 binds only unphosphorylated HIF-2α. The authors looked for sequences in HIF-2α that match NES motif Φx(23)Φx(23)ΦxΦ (Φ=L/I/V/F/M) and found none, but they found a few conserved hydrophobic residues at positions 662 and 667 near the phosphorylation site Ser672. Mutation of both Leu662 and Leu667 in 2 mutants L662A/L667A and L662A/L667A/S672A restored exclusive nuclear localization of HIF-2α.
References
[1]. "ERK1/2 phosphorylates HIF-2α and regulates its activity by controlling its CRM1-dependent nuclear shuttling"
Gkotinakou IM, Befani C, Simos G, Liakos P. (2019) J Cell Sci, 132(7):jcs225698 PubMed
Gkotinakou IM, Befani C, Simos G, Liakos P. (2019) J Cell Sci, 132(7):jcs225698 PubMed
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