This work was supported by grants from the National High Technology Research and Development Program of China (863 Program, 2012AA022103), the National Basic Research Program of China (973 Program, 2013CB733602, 2014CB745100), the Major Program of National Natural Science Foundation of China (Grant No. 21390204), the Program for New Century Excellent Talents in University (NCET-12-0876), the Foundation for the Author of National Excellent Doctoral Dissertation of China (FANEDD, 201256), the Priority Academic Program Development of Jiangsu Higher Education Institutions, and the 111 Project (111-2-06).
Pyrroloquinoline quinone (PQQ) plays a sig- nificant role as a redox cofactor in combination with dehydrogenases in bacteria. These dehydrogenases play key roles in the oxidation of important substrates for the biot...