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Wang J, Zhu J, Wang C, Zhou G, Yu X, Fan H, An R, Komiyama M, Liang X. Thermus thermophilus DNA Ligase Connects Two Fragments Having Exceptionally Short Complementary Termini at High Temperatures. Biochemistry 2020; 59:400-406. [PMID: 31887028 DOI: 10.1021/acs.biochem.9b00866] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Thermus thermophilus DNA ligase (Tth DNA ligase) is widely employed for cloning, enzymatic synthesis, and molecular diagnostics at high temperatures (e.g., 65 °C). It has been long believed that the complementary ends must be very long (e.g., >30 bp) to place two DNA fragments nearby for the ligation. In the current study, the length of the complementary portion was systematically varied, and the ligation efficiency was evaluated using the high resolution melting (HRM) method. Unexpectedly, very short oligonucleotides (7-10 nt) were successfully ligated on the complementary overhang attached to a dsDNA at 70 °C. Furthermore, sticky ends with the overhang of only 4 nt long, available after scission with many restriction enzymes, were also efficiently ligated at 45-70 °C. The ligation yield for the 6-nt-long sticky ends was as high as 80%. It was concluded that Tth DNA ligase can be used as a unique tool for DNA manipulation that cannot be otherwise easily accomplished.
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Affiliation(s)
- Jing Wang
- College of Food Science and Engineering , Ocean University of China , Qingdao 266003 , China.,CAS Key laboratory of Marine Ecology and Environmental Sciences , Institute of Oceanology, Chinese Academy of Sciences , Qingdao 266071 , China
| | - Jianming Zhu
- College of Food Science and Engineering , Ocean University of China , Qingdao 266003 , China
| | - Chenru Wang
- College of Food Science and Engineering , Ocean University of China , Qingdao 266003 , China
| | - Guangqing Zhou
- College of Food Science and Engineering , Ocean University of China , Qingdao 266003 , China
| | - Xin Yu
- College of Food Science and Engineering , Ocean University of China , Qingdao 266003 , China
| | - Huijun Fan
- College of Food Science and Engineering , Ocean University of China , Qingdao 266003 , China
| | - Ran An
- College of Food Science and Engineering , Ocean University of China , Qingdao 266003 , China.,Laboratory for Marine Drugs and Bioproducts , Qingdao National Laboratory for Marine Science and Technology , Qingdao 266003 , China
| | - Makoto Komiyama
- College of Food Science and Engineering , Ocean University of China , Qingdao 266003 , China
| | - Xingguo Liang
- College of Food Science and Engineering , Ocean University of China , Qingdao 266003 , China.,Laboratory for Marine Drugs and Bioproducts , Qingdao National Laboratory for Marine Science and Technology , Qingdao 266003 , China
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Liu Y, Ye M, Ge Q, Qu X, Guo Q, Hu X, Sun Q. Ratiometric Quantum Dot–Ligand System Made by Phase Transfer for Visual Detection of Double-Stranded DNA and Single-Nucleotide Polymorphism. Anal Chem 2016; 88:1768-74. [DOI: 10.1021/acs.analchem.5b04043] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Yuqian Liu
- State Key Laboratory
of Bioelectronics, School of Biological Science and Medical
Engineering, and Research Center for Learning Science, Southeast University, Nanjing 210096, People’s Republic of China
| | - Mingfu Ye
- State Key Laboratory
of Bioelectronics, School of Biological Science and Medical
Engineering, and Research Center for Learning Science, Southeast University, Nanjing 210096, People’s Republic of China
| | - Qinyu Ge
- State Key Laboratory
of Bioelectronics, School of Biological Science and Medical
Engineering, and Research Center for Learning Science, Southeast University, Nanjing 210096, People’s Republic of China
| | - Xiaojun Qu
- State Key Laboratory
of Bioelectronics, School of Biological Science and Medical
Engineering, and Research Center for Learning Science, Southeast University, Nanjing 210096, People’s Republic of China
| | - Qingsheng Guo
- State Key Laboratory
of Bioelectronics, School of Biological Science and Medical
Engineering, and Research Center for Learning Science, Southeast University, Nanjing 210096, People’s Republic of China
| | - Xianyun Hu
- State Key Laboratory
of Bioelectronics, School of Biological Science and Medical
Engineering, and Research Center for Learning Science, Southeast University, Nanjing 210096, People’s Republic of China
| | - Qingjiang Sun
- State Key Laboratory
of Bioelectronics, School of Biological Science and Medical
Engineering, and Research Center for Learning Science, Southeast University, Nanjing 210096, People’s Republic of China
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Li C, Ji Y, Wang C, Liang S, Pan F, Zhang C, Chen F, Fu H, Wang K, Cui D. BRCAA1 antibody- and Her2 antibody-conjugated amphiphilic polymer engineered CdSe/ZnS quantum dots for targeted imaging of gastric cancer. NANOSCALE RESEARCH LETTERS 2014; 9:244. [PMID: 24940175 PMCID: PMC4043660 DOI: 10.1186/1556-276x-9-244] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Accepted: 05/03/2014] [Indexed: 05/05/2023]
Abstract
Successful development of safe and highly effective nanoprobes for targeted imaging of in vivo early gastric cancer is a great challenge. Herein, we choose the CdSe/ZnS (core-shell) quantum dots (QDs) as prototypical materials, synthesized one kind of a new amphiphilic polymer including dentate-like alkyl chains and multiple carboxyl groups, and then used the prepared amphiphilic polymer to modify QDs. The resultant amphiphilic polymer engineered QDs (PQDs) were conjugated with BRCAA1 and Her2 monoclonal antibody, and prepared BRCAA1 antibody- and Her2 antibody-conjugated QDs were used for in vitro MGC803 cell labeling and in vivo targeted imaging of gastric cancer cells. Results showed that the PQDs exhibited good water solubility, strong photoluminescence (PL) intensity, and good biocompatibility. BRCAA1 antibody- and Her2 antibody-conjugated QD nanoprobes successfully realized targeted imaging of in vivo gastric cancer MGC803 cells. In conclusion, BRCAA1 antibody- and Her2 antibody-conjugated PQDs have great potential in applications such as single cell labeling and in vivo tracking, and targeted imaging and therapeutic effects' evaluation of in vivo early gastric cancer cells in the near future.
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Affiliation(s)
- Chao Li
- Institute of Nano Biomedicine and Engineering, Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Research Institute of Micro/Nano Science and Technology, Department of Instrument Science and Engineering, School of Electronics and Information, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
| | - Yang Ji
- Department of Imaging Center, Affiliated Hospital of Xi'an Medical University, Xi'an 710077, People's Republic of China
| | - Can Wang
- Department of Orthopedics, Xiangyan Hospital of Central South University, Changsha 410008, People's Republic of China
| | - Shujing Liang
- Institute of Nano Biomedicine and Engineering, Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Research Institute of Micro/Nano Science and Technology, Department of Instrument Science and Engineering, School of Electronics and Information, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
| | - Fei Pan
- Institute of Nano Biomedicine and Engineering, Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Research Institute of Micro/Nano Science and Technology, Department of Instrument Science and Engineering, School of Electronics and Information, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
| | - Chunlei Zhang
- Institute of Nano Biomedicine and Engineering, Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Research Institute of Micro/Nano Science and Technology, Department of Instrument Science and Engineering, School of Electronics and Information, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
| | - Feng Chen
- Institute of Nano Biomedicine and Engineering, Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Research Institute of Micro/Nano Science and Technology, Department of Instrument Science and Engineering, School of Electronics and Information, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
| | - Hualin Fu
- Institute of Nano Biomedicine and Engineering, Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Research Institute of Micro/Nano Science and Technology, Department of Instrument Science and Engineering, School of Electronics and Information, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
| | - Kan Wang
- Institute of Nano Biomedicine and Engineering, Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Research Institute of Micro/Nano Science and Technology, Department of Instrument Science and Engineering, School of Electronics and Information, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
| | - Daxiang Cui
- Institute of Nano Biomedicine and Engineering, Key Laboratory for Thin Film and Microfabrication of Ministry of Education, Research Institute of Micro/Nano Science and Technology, Department of Instrument Science and Engineering, School of Electronics and Information, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China
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