201. Isolation of a Bacillus cereus strain HBL-AI and its application for production of Trans-4-hydroxy-l-proline.
- Author
-
Wang XM, Han MN, Jiang JP, Fu SQ, Zhang FH, Du J, Zhang HL, and Li W
- Subjects
- Bacillus cereus genetics, Bacillus cereus isolation & purification, Bacillus cereus metabolism, Bacterial Proteins genetics, Bacterial Proteins metabolism, Escherichia coli genetics, Escherichia coli metabolism, Glucose metabolism, Ketoglutaric Acids metabolism, Molecular Sequence Annotation, Proline metabolism, Prolyl Hydroxylases genetics, Bacillus cereus enzymology, Genome, Bacterial genetics, Hydroxyproline biosynthesis, Prolyl Hydroxylases metabolism
- Abstract
A new trans-4-hydroxy-l-proline (trans-Hyp) producing Bacillus cereus HBL-AI, was isolated from the air, which was screened just using l-proline as carbon and energy sources. This strain exhibited 73·4% bioconversion rate from initial l-proline (3 g l
-1 ) to trans-Hyp. By sequencing the genome of this bacterium, 6244 coding sequences were obtained. Genome annotation analysis and functional expression were used to identify the proline-4-hydroxylase (BP4H) in HBL-AI. This enzyme belonged to a family of 2-oxoglutarate-related dioxygenases, which required 2-oxoglutarate and O2 as co-substrates for the reaction. Homologous modelling indicated that the enzyme had two monomers and contained conserved motifs, which included a distorted 'jelly roll' β strand core and the residues (HXDXnH and RXS). The engineering Escherichia coli 3 Δ W3110/pTrc99a-proba-bp4h was constructed using BP4H, which transformed glucose to trans-Hyp in one step with high concentration of 46·2 g l-1 . This strategy provides a green and efficient method for synthesis of trans-Hyp and thus has a great potential in industrial application., (© 2020 The Society for Applied Microbiology.)- Published
- 2021
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