The MMLV Reverse Transcriptase(short name MMLV) i is iolated from E.coli carrying rat leukemia virus pol gene consists of a single peptide, molecule weight 71kd.It possesses RNA and DNA depended polymerase activity and weak RNase H activity. Concentration: 200U/μlComponent : M-MLV （200U/μl） 5×Buffer （with DTT）Package： Bulk Features:Weak RNaseH activity; High cDNA yieldStoreage: -20℃Application：Synthesis of the first chain cDNA, cDNA Library construction, one-step RT-PCR, primer extention, 3′ and 5′RACESource: Recombination of E.coli containing Moloney murine leukemia virus reverse transcriptase gene from clone of Moloney murine .Unit definition:One unit is defined as the required enzyme incorporate 1 nm dNTP into a polynucleotide fraction in 10 min at 37℃, taking polyA﹒poly(dT)12-18 as template-primer.Procedure:1. add the next reaction mixture to ice bath tube :1) template RNAtotal RNA 0.1-5μgor total poly(A)+mRNA 0.1-0.5μgor unique RNA 0.01pg-0.5μg2) primerOligo(dT)18 (0.5μg/μl) 1μlOr stochastic primer（0.2μg/μl） 1μlOr sequence especially primer 20pmol3) RNase-free ddh2o : constant volume to 11μl2. Gently mix and water bath for 5 min in 70℃ and chill on ice.3. Put the tube into ice and add the next composition :5×Reaction Buffer 4μlRNase Inhibitor (40U/μl) 0.5μldNTP Mix(10mmol/L) 2μladd water to 19ul ,gently mix and then water bath for 5 min in 37℃ ; or for 5 min in 25℃ for random primer 4. Spin down for a few seconds. Add 1μl M-MLV RT（200U/μl）5. Incubate at 42℃ for 60min(if use a random primer,first incubate for 10min in 25℃6. Inactivate at 70℃ for 10min.PCR Reaction1. Transfer 10% volume of first reaction solution (2 μl ) to a proper PCR tube .note: the first reaction solution can be directly used as PCR template without purification ,the dosage is about 1-5μl. if excessively used ,the salt and Random primers in first reaction solution will restrain the activity of DNA polymerase .if purification needed ,it can follow the next :after reaction end of cDNA synthesis (step 6) , add RNase A in reaction system , 10 min in 37℃ ,use DP1501 recover cDNA .2. add next solution by order .5μl 10X PCR Buffer1μl 10mM dNTP mix1μl 10μM Primer #1 (customer supplied)1μl 10μM Primer #2 (p customer supplied)xμl H20 (total reaction volume:49μl)1μl Taq DNA polymerase3. Mix thoroughly and add 50μl mineral oil to the surface of liquid.4. Amplified reaction : according to annealing temperature or gene copy number or technical parameter of Taq DNA polymerase , setting amplified condition , specify reference to specification of DNA polymerase ,the usually cycle number is 30-355 Detect the product in agarose containing EB or another fluorescent dye.
