| 摘要 |
<p>Micro-organisms capable of the production of 1,2-propanediol from a simple source of carbon (I) are obtained by selective culture of an initial strain in presence of (I), by deleting the tpiA gene and the gene(s) involved in the conversion of methylglyoxal into lactate and causing the evolution of genes with improved 1,2-propanediol synthase activity. Method (M1) for the preparation of a strain of micro-organisms capable of the production of 1,2-propanediol (PD) by metabolism of a simple source of carbon (I). This involves: (a) the selective culture of an initial strain in a suitable culture medium containing (I) by deletion of the gene tpiA and of at least one gene involved in the conversion of methylglyoxal (propanal) into lactate, in order to bring about the evolution in this initial strain of one or more genes involved in the biosynthetic route from DHAP to methylglyoxal and then to PD into genes with improved PD-synthase activity, followed by; (b) selection and isolation of the improved strain(s). Independent claims are also included for (1) an initial strain as defined above (2) the evolved strain obtained by this method (3) method (M2) for the production of PD by culturing the evolved strain in a suitable medium containing a simple source of carbon, and then isolating the PD obtained.</p> |
