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| Construct the Uracil Phosphoribosyl Transferase Gene Mutant Strain in Gluconobacter suboxydans for Seamless Genome Editing |
| DU Hong-yan, LI Tian-ming, LIU Jin-lei, FENG Hui-yong |
| College of Biological Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China |
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Abstract Gluconobacter suboxydans is an important industrial microbiology and can incompletely and efficiently oxidize a great variety of carbohydrates, alcohols and other polyols to form the corresponding aldehydes, ketones and organic acids and other products. The use of homologous recombination technology to transform genomic modification is an effective means of industrial breeding. There are many defects when use antibiotic marker as the screening marker in traditional methods. The construction of uracil phosphoribosyl transferase gene deletion strain is to achieve Gluconobacter suboxydans seamless genome editing. The suicide plasmid pMD18-Jqupp is transformed into wild type Gluconobacter suboxydans J12 and the mutant which knocked encoding uracil phosphoribosyl transferase gene was screened by tetracycline resistance and 5-fluorouracil. The physiological validation results show that the mutant strain can grow on medium containing 0.5mg/ml 5-fluorouracil, but the mutant covering upp gene can't grow on medium containing 0.5mg/ml 5-fluorouracil. It proves that the upp gene can be used as a negative selection marker in G.suboxydans-upp mutants to achieve Gluconobacter suboxydans genome modification and transformation by twice homologous recombination. It provides the foundation of changing Gluconobacter suboxydans to obtain valuable industrial strains using metabolic engineering in the future.
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Received: 18 January 2016
Published: 16 March 2016
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