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1、最新[醫(yī)學(xué)]RNA結(jié)合蛋白與轉(zhuǎn)錄后調(diào)控-藥學(xué)醫(yī)學(xué)精品資料mRNAturnoverTranslationlevelPost-translationlevelTranscriptionlevelGeneRegulationDNAandchromatinlevelsPost-transcriptionallevelMaturationmRNAexportRegulatoryfactorsformRNAdecayandtranslationRNAbindingproteinsmicroRNAsTTP與HuR及AUF1不同,TTP主要位于細(xì)胞漿,結(jié)合II類AREs。結(jié)合目標(biāo)后主要使目標(biāo)
2、不穩(wěn)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結(jié)合蛋白相互作用。如,HuR與AUF1均可結(jié)合于p21與cyclinD13’UTR,但二者有競爭,且功能相反。2.RNA結(jié)合蛋白與microRNA間相互作用。如,HuR與let-7,miR-122,TTP與miR-16。AU-richElements(AREs)1.主要指位于3‘-非翻譯區(qū)的富含AU的序列。2.被RNA結(jié)合蛋白識別,結(jié)合。3.主要為mRNA不穩(wěn)定元件,是mRNA在完成使命后快速降解的結(jié)構(gòu)基礎(chǔ)。4.依構(gòu)成分為三類1)
7、含1-5個(gè)分散的AUUUA。2)至少有兩個(gè)OverlappingUUAUUUA(U/A)(U/A).依AUUUA的重復(fù)方式分為5類,IIA,IIB,IIC,等。3)富含U,但無AUUUA。注:除一級結(jié)構(gòu)外,mRNA的二級結(jié)構(gòu)也與RNA-蛋白質(zhì)相互作用密切相關(guān)。如,約70-80%HuR或AUF1結(jié)合序列具有相似的二級結(jié)構(gòu)mRNAsARE-BPsClassMotifExamplesI1to5個(gè)散在AUUUAc-mycAUF1,HuR,Hel-N1,HuC,HuD,AUH,GAPDH,Hsp70c-fo