Minglong Li , Khalid Doudin , David B. Robins , Georgios Tetradis-Mairis , Tuck Seng Wong , Kang Lan Tee
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引用次数: 0
Abstract
Polyhydroxyalkanoates (PHAs) are biopolymers naturally produced by various microorganisms and offer a sustainable alternative to fossil fuel-derived plastics. They can be synthesized from diverse feedstock, including waste biomass such as lignocellulose, municipal waste, sludge, and industrial by-products. To tailor their properties for specific applications, PHAs are typically blended post synthesis. An alternative approach is the direct synthesis of PHA blends in a single fermentation, which can reduce the need for multiple separate fermentations and extractions. In this study, we engineered Pseudomonas putida to synthesize PHA blends composed of poly-3-hydroxybutyrate [P3(HB)] and medium-chain-length PHA (mcl-PHA). Through using different promoters, blends with 3HB monomer content ranging from 17.9 mol% to 99.6 mol% were produced. Optimizing cultivation conditions yielded a maximum PHA production of 1.48 ± 0.15 g/L, with a PHA content of 52.2 ± 4.3 wt% of cell dry weight. A combination of gel permeation chromatography, nuclear magnetic resonance and diffusion ordered spectroscopy were employed to determine the molecular weight and confirm the identity of the PHA blend, revealing in all cases, a higher molecular weight P(3HB) than mcl-PHA. The blends produced had thermal properties comparable to PHA blends produced by post synthesis melt compounding. This work demonstrates the microbial synthesis of PHA blends in P. putida and is the first instance of blend composition control via promoter selection, paving the way for the one-step biomanufacturing of customizable PHA blends.
期刊介绍:
New Biotechnology is the official journal of the European Federation of Biotechnology (EFB) and is published bimonthly. It covers both the science of biotechnology and its surrounding political, business and financial milieu. The journal publishes peer-reviewed basic research papers, authoritative reviews, feature articles and opinions in all areas of biotechnology. It reflects the full diversity of current biotechnology science, particularly those advances in research and practice that open opportunities for exploitation of knowledge, commercially or otherwise, together with news, discussion and comment on broader issues of general interest and concern. The outlook is fully international.
The scope of the journal includes the research, industrial and commercial aspects of biotechnology, in areas such as: Healthcare and Pharmaceuticals; Food and Agriculture; Biofuels; Genetic Engineering and Molecular Biology; Genomics and Synthetic Biology; Nanotechnology; Environment and Biodiversity; Biocatalysis; Bioremediation; Process engineering.