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1、最新[医学]RNA结合蛋白与转录后调控-药学医学精品资料mRNAturnoverTranslationlevelPost-translationlevelTranscriptionlevelGeneRegulationDNAandchromatinlevelsPost-transcriptionallevelMaturationmRNAexportRegulatoryfactorsformRNAdecayandtranslationRNAbindingproteinsmicroRNAsTTP与HuR及AUF1不同,TTP主要位于细胞浆,结合II类AREs。结合目标后主要使目标
2、不稳定。如:COX-2,TNF-alpha,GM-CSF,等。EffectofARE-BPsonthestabilityandtranslationofARE-containingmRNAsARE-BPsmRNAstabilityProteinexpressionTranslationalefficiencyAbundanceIncreaseDecreaseIncreaseDecreaseUpregulatedDownregulatedAUF1c-myc(42)c-myc(46)GM–CSF(55)c-fos(42,67)c-fos(53)IL-3(55)PTH(56)p21
3、(48)GM–CSF(42)CyclinD1(48)TNF-alpha(42)GM–CSF(53,54)IL-3(55)HuRc-fos(59,63,67)p53(99,137)TNF-alpha(139)p21(69)TNF-alpha(139)MyoD(68)Cox-2(139)CyclinA(70)p21(48,68,69)CyclinB1(70)CyclinA(70)NOSII/iNOS(64)CyclinB1(70)GM–CSF(55)CyclinD1(48)Cox-2(71,173)NOSII/iNOS(64)IL-3(55)GM–CSF(59)VEGF(173)
4、TNF-alpha(65,74,139)p53(99,137)Cox-2(71,139)IL-3(55,66)VEGF(62)Myogenin(68)Hel-N1TNF-alpha(74)NF-M(73)NF-M(73)GLUT1(72)GLUT1(72)GLUT1(72)HuDGAP-43(75–77)GAP-43(75,76)TTPc-fos(90)GM–CSF(81)GM–CSF(18,81,83–85,91)TNF-alpha(80)TNF-alpha(18,81,83–86,89,90)IL-2(82)Cox-2(87)IL-3(88)IL-2(82,90)IL-3
5、(18,66,83,84,88)BRF1TNF-alpha(89,93)GM–CSF(55)IL-3(55,92,93)IL-3(55)TIA-1TNF-alpha(120)TNF-alpha(120)Cox-2(121)Cox-2(121)KSRPc-fos(90,93)NOSII/iNOS(102)NOSII/iNOS(102)TNF-alpha(90,93)IL-2(90,93)c-jun(93)CUG-BP2Cox-2(150)Cox-2(150)Cox-2(150)Nucleolinbcl-2(175)TINObcl-2(176)PAIP2VEGF(177)VEGF
6、(177)Interactionofthefactorsinvolvinginpost-transcriptionalregulation1.RNA结合蛋白相互作用。如,HuR与AUF1均可结合于p21与cyclinD13’UTR,但二者有竞争,且功能相反。2.RNA结合蛋白与microRNA间相互作用。如,HuR与let-7,miR-122,TTP与miR-16。AU-richElements(AREs)1.主要指位于3‘-非翻译区的富含AU的序列。2.被RNA结合蛋白识别,结合。3.主要为mRNA不稳定元件,是mRNA在完成使命后快速降解的结构基础。4.依构成分为三类1)
7、含1-5个分散的AUUUA。2)至少有两个OverlappingUUAUUUA(U/A)(U/A).依AUUUA的重复方式分为5类,IIA,IIB,IIC,等。3)富含U,但无AUUUA。注:除一级结构外,mRNA的二级结构也与RNA-蛋白质相互作用密切相关。如,约70-80%HuR或AUF1结合序列具有相似的二级结构mRNAsARE-BPsClassMotifExamplesI1to5个散在AUUUAc-mycAUF1,HuR,Hel-N1,HuC,HuD,AUH,GAPDH,Hsp70c-fo