Biotechnology Bulletin ›› 2020, Vol. 36 ›› Issue (9): 266-274.doi: 10.13560/j.cnki.biotech.bull.1985.2020-0161

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Optimization of GoldenBraid Digestion-ligation Reaction System

XU Mei-hui1, ZHANG Yao-jie2, TANG Ke-xuan1,2, MIAO Zhi-qi2   

  1. College of Agriculture and Biology,Shanghai Jiao Tong University,Shanghai 200240
  • Received:2020-02-21 Online:2020-09-26 Published:2020-09-30

Abstract: The objective of this work is to establish an efficient and stable GoldenBraid(GB)restriction-ligation assembly reaction system. In this study,enzyme digestion time,buffer system,restriction enzymes and ratio of substrates were optimized to improve the efficiency of effective cloning,and the optimal reaction system was determined. Results showed that the percentage of effective cloning was nearly 99% under 4 min enzyme digestion time,1 μL FastDigest Buffer(10×)buffer system,1 mmol/L ATP,0.5 μL FastDigest Esp3I or FastDigest Eco31I,and 3∶1 molar ratio of the inserts and acceptor plasmid in reaction system,which was over 4 times of that before optimization(BsmBI 8% and BsaI 23%),and digestion-ligation efficiency was nearly 100%. The percentage of effective cloning significantly increased by optimizing reaction system even with less volume of restriction enzymes,compared to the original protocol with 1 μL restriction enzymes. This indicates that the efficiency and practicability of digestion-ligation in GB system may be improved via the optimized process.

Key words: GoldenBraid, optimization, effective cloning, efficiency of enzyme digestion and ligation