Metabolic engineering of Escherichia coli for poly(3-hydroxypropionate) production from glycerol and glucose
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Abstract
A new poly(3-hydroxypropionate) (P3HP) biosynthetic pathway employing β-alanine as an intermediate from an inexpensive carbon source was developed in recombinant Escherichia coli. After a series of systematic optimization, the genes for L-aspartate decarboxylase and its maturation factor (panD and panM, from E. coli), β-alanine-pyruvate transaminase (pp0596, from Pseudomonas putida), 3-hydroxy acid dehydrogenase and 3-hydroxypropionyl-CoA synthase (ydfG and prpE respectively, from E. coli), and polyhydroxyalkanoate synthase (phaC1, from Cupriavidus necator) were cloned and expressed in E. coli. Under shake-flask conditions, the recombinant strain produced 0.5 g P3HP l−1 from glycerol and glucose, up to 10.2 % of CDW. Though the content of P3HP was low, this pathway has some advantages over other reported pathways, such as being redox neutral, does not require any coenzyme, and can use a wide range of carbon sources.
Keywords
β-Alanine Inexpensive carbon sources Poly (3-hydroxypropionate) Recombinant Escherichia coliNotes
Acknowledgments
This research was financially supported by the 100-Talent Project of CAS (for GZ), Director Innovation Foundation of QIBEBT, CAS (Y112141105), National Natural Scientific Foundation of China (31200030, 21376255), Natural Scientific Foundation of Shandong Province (ZR2013EMZ002), and Qingdao Applied Basic Research Program (12-1-4-9-(5)-jch). We also acknowledge Dr. Birgit Alber (Ohio State University) for supplying the plasmid pKS1.
Supplementary material
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