
ProductDescription
RibonucleaseHfromE.coli
RibonucleaseHisanendonucleasewhichspecificallydegradestheRNAmoietyofaDNA:RNAhybrid,withoutaffectingtheunhybridizedRNA.Itdoesnotaffectdouble-strandedRNAorDNA.Itisprovidedina50%glycerolstoragebuffer.ItisalsoavailableinaTrehaloseBuffer(Suitableforlyophilization).Concentration1000U/mL.
Pleaseinquireforcustomconcentrationsandbulkquantities.
Applications:
Enablingthesynthesisofsecond-strandCDNAbyremovaloftheRNA
UsedinconjunctionwithAMVRTandT7RNAPolymeraseinamplificationofRNA
UnitDefinition:
OneunitofRNaseHisthatamountofenzymewhichcatalysistheproductionofonenmolofacid-solublenucleotidein20minutesat37ºCusingthefollowingreactionconditions:
40mMTrisHCl,pH7.5
1.0µM[3H]-poly(rA):24µMpoly(dT)
4.0mMMgCl2
1.0mMDTT
30µg/mLBSA
4.0%glycerol
StorageBufferConditionsofRNaseHinGlycerol:
20:0mMTrisHCl,pH7.5
300mMKCl
20.0mMMagnesiumAcetate
7.0mMEDTA
1.0mMDithiothreitol
50%Glycerol
0.2%TritonX100
StorageBufferConditionsofRNaseHinTrehalose.Sameasabove,exceptfor1.0MTrehaloseinsteadofGlycerol.
QualityControl:
DNaseActivity:
One-halfµgofHaefragmentsofPhiX-174DNAisincubatedat37ºCwith2.5unitsofRNaseHfor3hours,andthenelectrophoresedinanativeagarosegelsimultaneouslywithcontrolpositiveDNase1reactions.Nomorethantheequivalentof2.5X10E-4unitofDNase1isdetected.
RibonucleaseActivity:
OnemicrogramofanRNALadderisincubatedfor2hoursat37ºCwith4.0unitsofRNaseH,andthenelectrophoresedinanativeagarosegelsimultaneouslywithcontrolpositiveRNase1Areactions.Nomorethantheequivalentof8X10-8unitofRNase1Aisdetected.
SpecificActivity:
ThespecificactivityoftheE.coliRNaseHisnolessthan300,000unitspermg.
References:
Sambrook,J.,Fritsch,E.F.,andManiatis,T.(1989)MolecularCloning:ALaboratoryManual,(2ndEd.),8.64–8.65
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如果能分解,那小肠液中的消化酶如何大量共存,如果不能
那它如何识别其他蛋白质物质是不是消化酶?
胰蛋白酶Trypsin (Parenzyme) 为蛋白酶的一种,EC 3.4.4.4,是从牛、羊、猪的胰脏提取的一种丝氨酸蛋白水解酶。在脊椎动物中,作为消化酶而起作用。在胰脏是作为酶的前体胰蛋白酶原而被合成的。作为胰液的成分而分泌,受肠激酶,或胰蛋白酶的限制分解成为活化胰蛋白酶,是肽链内切酶,它能把多肽链中赖氨酸和精氨酸残基中的羧基侧切断。它不仅起消化酶的作用,而且还能限制分解糜蛋白酶原、羧肽酶原、磷脂酶原等其它酶的前体,起活化作用。是特异性最强的蛋白酶,在决定蛋白质的氨基酸排列中,它成为不可缺少的工具。
那糖酵解中依赖NAD的酶不是要在线粒体内反应?
(2)不同点:①影响因素:变构调节是由细胞内变构效应剂浓度的改变而影响酶的活性;化学修饰调节是激素等信息分子通过酶的作用而引起共价修饰。②酶分子改变:变构效应剂通过非共价键与酶的调节亚基或调节部位可逆结合,引起酶分子构像改变,常表现为变构酶亚基的聚合或解聚;化学修饰调节是酶蛋白的某些基团在其他酶的催化下发生共价修饰而改变酶活性。③特点及生理意义:变构调节的动力学特征为S型曲线,在反馈调节中可防止产物堆积和能源的浪费;化学修饰调节耗能少,作用快,有放大效应,是经济有效的调节方式。

