School of Chemical Engineering and Technology;
Tianjin University;
Tianjin 300072;
China;
Key Laboratory of System Bioengineering;
Ministry of Education;
Tianjin University;
Tianjin 300072;
China;
SynBio Research Platform;
Collaborative Innovation Center of Chemical Science and Engineering;
Tianjin 300072;
China;
dammarenediol-Ⅱ synthase; homology modeling; molecular docking; active sites; mutation;