主权项 |
1. A genetically modified strain of Sphingomonas comprising multiple copies or increased expression of at least one gene on a plasmid, wherein the at least one gene comprises an isolated nucleic acid molecule which encodes at least one diutan biosynthetic enzyme as shown in SEQ ID NO: 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, and 43, or an enzyme which is at least 95% identical to SEQ ID NO: 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, and 43. |