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Nugraha Y, Laksmi FA, Nuryana I, Helbert, Khasna FN. Production of reverse transcriptase from Moloney murine Leukemia virus in Escherichia coli expression system. Prep Biochem Biotechnol 2024:1-9. [PMID: 38411149 DOI: 10.1080/10826068.2024.2317311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2024]
Abstract
Reverse transcriptase (RT) is one of the most important enzymes used in molecular biology applications, enabling the conversion of RNA into complementary DNA (cDNA) that is used in reverse transcription-polymerase chain reaction (RT-PCR). The high demand of RT enzymes in biotechnological applications making the production optimization of RT is crucial for meeting the growing demand in industrial settings. Conventionally, the expression of recombinant RT is T7-induced promoter using IPTG in Escherichia coli expression systems, which is not cost-efficient. Here, we successfully made an alternative procedure for RT expression from Moloney murine leukemia virus (M-MLV) using autoinduction method in chemically defined medium. The optimization of carbon source composition (glucose, lactose, and glycerol) was analyzed using Response Surface Methodology (RSM). M-MLV RT was purified for further investigation on its activity. A total of 32.8 mg/L purified M-MLV RT was successfully obtained when glucose, glycerol, and lactose were present at concentration of 0.06%, 0.9%, and 0.5% respectively, making a 3.9-fold improvement in protein yield. In addition, the protein was produced in its active form by displaying 7462.50 U/mg of specific activity. This study provides the first step of small-scale procedures of M-MLV RT production that make it a cost-effective and industrially applicable strategy.
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Affiliation(s)
- Yudhi Nugraha
- Research Center for Molecular Biology Eijkman, National Research and Innovation Agency, Cibinong, Bogor, West Java, Indonesia
| | - Fina Amreta Laksmi
- Research Center for Applied Microbiology, National Research and Innovation Agency, Cibinong, Bogor, West Java, Indonesia
| | - Isa Nuryana
- Research Center for Applied Microbiology, National Research and Innovation Agency, Cibinong, Bogor, West Java, Indonesia
| | - Helbert
- Research Center for Ecology and Ethnobiology, National Research and Innovation Agency, Cibinong, Bogor, West Java, Indonesia
| | - Firyal Nida Khasna
- Research Center for Applied Microbiology, National Research and Innovation Agency, Cibinong, Bogor, West Java, Indonesia
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Expression of Codon-Optimized Gene Encoding Murine Moloney Leukemia Virus Reverse Transcriptase in Escherichia coli. Protein J 2022; 41:515-526. [PMID: 35933571 PMCID: PMC9362449 DOI: 10.1007/s10930-022-10066-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/10/2022] [Indexed: 10/27/2022]
Abstract
Moloney murine leukemia virus reverse transcriptase (MMLV-RT) is the most frequently used enzyme in molecular biology for cDNA synthesis. To date, reverse transcription coupled with Polymerase Chain Reaction, known as RT-PCR, has been popular as an excellent approach for the detection of SARS-CoV-2 during the COVID-19 pandemic. In this study, we aimed to improve the enzymatic production and performance of MMLV-RT by optimizing both codon and culture conditions in E. coli expression system. By applying the optimized codon and culture conditions, the enzyme was successfully overexpressed and increased at high level based on the result of SDS-PAGE and Western blotting. The total amount of MMLV-RT has improved 85-fold from 0.002 g L-1 to 0.175 g L-1 of culture. One-step purification by nickel affinity chromatography has been performed to generate the purified enzyme for further analysis of qualitative and quantitative RT activity. Overall, our investigation provides useful strategies to enhance the recombinant enzyme of MMLV-RT in both production and performance. More importantly, the enzyme has shown promising activity to be used for RT-PCR assay.
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Baba M, Kojima K, Nakase R, Imai S, Yamasaki T, Takita T, Crouch RJ, Yasukawa K. Effects of neutral salts and pH on the activity and stability of human RNase H2. J Biochem 2017; 162:211-219. [PMID: 28402412 DOI: 10.1093/jb/mvx021] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Accepted: 02/13/2017] [Indexed: 11/14/2022] Open
Abstract
Ribonuclease H (RNase H) specifically degrades the RNA of RNA/DNA hybrid. Recent study has shown that a single ribonucleotide is embedded in DNA double strand at every few thousand base pairs in human genome, and human RNase H2 is involved in its removal. Here, we examined the effects of neutral salts and pH on the activity and stability of human RNase H2. NaCl, KCl, RbCl and NaBr increased the activity to 170-390% at 10-60 mM, while LiCl, LiBr and CsCl inhibited it, suggesting that species of cation, but not anion, is responsible for the effect on activity. NaCl and KCl increased the stability by decreasing the first-order rate constant of the inactivation to 50-60% at 60-80 mM. The activity at 25-35 °C exhibited a narrow bell-shaped pH-dependence with the acidic and alkaline pKe (pKe1 and pKe2) values of 7.3 - 7.6 and 8.1 - 8.8, respectively. Enthalpy changes (ΔH°) of deprotonation were 5 ± 21 kJ mol-1 for pKe1 and 68 ± 25 kJ mol-1 for pKe2. These results suggest that the ionizable groups responsible for pKe1 may be two out of Asp34, Glu35 and Asp141 of DEDD motif, and that for pKe2 may be Lys69 of DSK motif.
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Affiliation(s)
- Misato Baba
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Oiwakecho, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
| | - Kenji Kojima
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Oiwakecho, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
| | - Rihoko Nakase
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Oiwakecho, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
| | - Shota Imai
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Oiwakecho, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
| | - Tomomi Yamasaki
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Oiwakecho, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
| | - Teisuke Takita
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Oiwakecho, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
| | - Robert J Crouch
- Section on Formation of RNA, Division of Developmental Biology, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA
| | - Kiyoshi Yasukawa
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Oiwakecho, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan
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Katano Y, Hisayoshi T, Kuze I, Okano H, Ito M, Nishigaki K, Takita T, Yasukawa K. Expression of moloney murine leukemia virus reverse transcriptase in a cell-free protein expression system. Biotechnol Lett 2016; 38:1203-11. [PMID: 27053084 DOI: 10.1007/s10529-016-2097-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Accepted: 03/31/2016] [Indexed: 10/22/2022]
Abstract
OBJECTIVE To characterize Moloney murine leukemia virus (MMLV) reverse transcriptases (RTs) expressed in a cell-free system and in Escherichia coli. RESULTS We previously expressed MMLV RT using an E. coli expression system and generated a highly thermostable quadruple variant MM4 (E286R/E302K/L435R/D524A) by site-directed mutagenesis. In this study, we expressed the wild-type MMLV RT (WT) and MM4 using a cell-free protein expression system from insect cells. WT exhibited DNA polymerase and RNase H activities, while MM4, in which the catalytic residue for RNase H activity, Asp524 is changed into Ala, exhibited only DNA polymerase activity. MM4, when held at 60 °C for 10 min, retained DNA polymerase activity, while WT, held at 54 °C for 10 min, lost this activity. In the cDNA synthesis reaction (0.5 μl) in which WT or MM4 were exposed to various temperatures and amounts of target RNA in a microarray chip, MM4 exhibited higher thermostability than WT. CONCLUSION MMLV RT expressed in the cell-free system is indistinguishable from that expressed in E. coli.
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Affiliation(s)
- Yuta Katano
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Tetsuro Hisayoshi
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Ikumi Kuze
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Hiroyuki Okano
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Masaaki Ito
- Okinawa National College of Technology, Nago, Japan
| | - Koichi Nishigaki
- Saitama-Bio-Monodukuri-Network Research Organization, Saitama University, Saitama, Japan.,National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
| | - Teisuke Takita
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Kiyoshi Yasukawa
- Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Kyoto, Japan.
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