Project description:Biomanufacturing remains financially uncompetitive with the lower cost but higher carbon emitting hydrocarbon based chemical industry. Novel chassis organisms may enable cost reductions with respect to traditional chassis such as E. coli and so open an economic rout to low emission biomanufacturing. Extremophile bacteria exemplify that potential. Salt tolerant halomonas species thrive in conditions inimical to other organisms. Their adoption would eliminate the cost of sterilising equipment. Novel chassis are inevitably poorly understood in comparison to established organisms. Rapid characterisation and community data sharing will facilitate organisms’ adoption for biomanufacturing. This paper describes baseline proteomics data set for Halomonas bluephagenesis TD01 under active development for biomanufactoring. The data record comprises a newly sequenced genome for the organism; evidence for expression of 1150 proteins (30% of the proteome) including baseline quantification of 1050 proteins (27% of the proteome) and a spectral library enabling re-use for targeted proteomics assays. Protein data is annotated with KEGG Orthology enabling rapid matching of quantitative data to pathways of interest to biomanufacturing.
Project description:BackgroundEctoine as an amino acid derivative is widely applied in many fields, such as the food industry, cosmetic manufacturing, biologics, and therapeutic agent. Large-scale production of ectoine is mainly restricted by the cost of fermentation substrates (e.g., carbon sources) and sterilization.ResultsIn this study, Halomonas cupida J9 was shown to be capable of synthesizing ectoine using xylose as the sole carbon source. A pathway was proposed in H. cupida J9 that synergistically utilizes both WBG xylose metabolism and EMP glucose metabolism for the synthesis of ectoine. Transcriptome analysis indicated that expression of ectoine biosynthesis module was enhanced under salt stress. Ectoine production by H. cupida J9 was enhanced by improving the expression of ectoine biosynthesis module, increasing the intracellular supply of the precursor oxaloacetate, and utilizing urea as the nitrogen source. The constructed J9U-P8EC achieved a record ectoine production of 4.12 g/L after 60 h of xylose fermentation. Finally, unsterile production of ectoine by J9U-P8EC from either a glucose-xylose mixture or corn straw hydrolysate was demonstrated, with an output of 8.55 g/L and 1.30 g/L of ectoine, respectively.ConclusionsThis study created a promising H. cupida J9-based cell factory for low-cost production of ectoine. Our results highlight the potential of J9U-P8EC to utilize lignocellulose-rich agriculture waste for open production of ectoine.