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营养压力(即限制乙酰辅酶A从葡萄糖转化或乙酸酯获取),引起ACSS2在S659位点磷酸化并向核内转移。与TFEB结合的ACSS2会在溶酶体和自噬相关基因启动子区域与染色体结合,促进吸收、利用组蛋白乙酰化循环释放的乙酸脂合成乙酰辅酶A,后者驱动H3组蛋白乙酰化并活化上述基因表达。上述过程促进溶酶体生长,自噬以及脑肿瘤生长。

Figure1.ACSS2S659PhosphorylationbyAMPKInducesNuclearTranslocationofACSS2
(B–G)Immunoblotanalyseswereperformedwiththeindicatedantibodies.

Figure1.ACSS2S659PhosphorylationbyAMPKInducesNuclearTranslocationofACSS2
(B–G)Immunoblotanalyseswereperformedwiththeindicatedantibodies.
- U87cellsweredeprivedofglucosefor1hr.Immunofluorescentanalyseswereperformedwithananti-ACSS2antibody.DAPI(blue)wasusedtostainthenuclei.
- U87cellsweredeprivedofglucosefor1hr.Totalcelllysatesandcytosolicandnuclearfractionswereprepared.ActivationofAMPKisreflectedbyAMPKaT172phosphorylation.
- WTandAMPKa1andAMPKa2double-knockout(DKO)MEFsweretreatedwith2-DG(25mM)fortheindicatedperiods.Totalcelllysatesandcytosolicandnuclearfractionswereprepared.
- U87cellsweredeprivedofglucosefor10min.Immunoprecipitationwithananti-AMPKaantibodywasperformed.
- PurifiedAMPKwasmixedwiththeindicatedbacteriallypurifiedHis-ACSS2proteinsand[g-32P]ATPinthepresenceorabsenceofAMP(100mM).Auto-rADIographicanalysiswasperformed.
- U87cellsexpressingtheindicatedFLAG-ACSS2proteinsweredeprivedofglucosefor1hr.Immunoprecipitationwithananti-FLAGantibodywasperformed.ActivationofAMPKisreflectedbyitssubstrateacetyl-CoAcarboxylase(ACC)S79phosphorylation.
- WTandAMPKa1/2DKOMEFsweredeprivedofglucosefor1hr.Totalcelllysateswereprepared.
U87cellsexpressingtheindicatedFLAG-ACSS2proteinsweredeprivedofglucosefor1hr.Immunofluorescentanalyseswereperformedwithananti-FLAGantibody.ThepercentageofnuclearACSSin20cellsineachgroupwasquantitated(right)usingImageJ.Atwo-tailedStudent’sttestwasused.*p<0.001.
原文参考链接
Lietal.,2017,MolecularCell66,1–14June1,2017ª2017ElsevierInc.
http://dx.doi.org/10.1016/j.molcel.2017.04.026
Nucleus-TranslocatedACSS2PromotesGeneTranscriptionforLysosomalBiogenesis
andAutophagy
本文应用核心抗体
SW58003 ACSS2(Phospho-Ser659)Antibody
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发布于 : 2021-09-05
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