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    • 7. 发明授权
    • Methods of making polyhydroxyalkanoates comprising 4-hydroxybutyrate
monomer units
    • 制备包含4-羟基丁酸酯单体单元的聚羟基链烷酸酯的方法
    • US6117658A
    • 2000-09-12
    • US23029
    • 1998-02-12
    • Douglas E. DennisHenry E. Valentin
    • Douglas E. DennisHenry E. Valentin
    • C12N9/04C12N9/10C12N15/52C12N15/82C12P7/62C12P1/04C12P7/42C12P7/52
    • C12N9/0006C12N15/52C12N15/8243C12N9/13C12P7/625
    • The PHA biosynthetic pathway is combined with a succinic semialdehyde metabolic pathway that metabolizes succinic semialdehyde via a 4-hydroxybutyryl-CoA intermediate in order to produce high levels of PHA comprising 4HB monomer units. This combination is particularly useful, in part, because the PHA biosynthetic pathway is well known and has been expressed to produce P(3HB) to levels as high as 70-80% of the cell dry weight, while the succinic semialdehyde metabolic pathway is also well known, and the combination of the two pathways means that production of PHAs comprising 4HB monomer units does not depend on immediate precursors of 4-hydroxybutyrate. Rather, the production of the PHAs comprising 4HB monomer units can occur simply from the extraction of succinate or succinyl-CoA from the citric acid cycle when the host cell is grown on an inexpensive carbon source such as glucose.
    • 将PHA生物合成途径与琥珀酸半醛代谢途径结合,其通过4-羟基丁酰-CoA中间体代谢琥珀酸半醛,以产生包含4HB单体单元的高水平PHA。 这种组合在某种程度上是特别有用的,因为PHA生物合成途径是众所周知的并已表达以产生P(3HB)至高达细胞干重的70-80%的水平,而琥珀酸半醛代谢途径也是 众所周知,并且两个途径的组合意味着包含4HB单体单元的PHA的生产不依赖于4-羟基丁酸酯的即时前体。 相反,当宿主细胞在廉价的碳源如葡萄糖上生长时,包含4HB单体单元的PHA的生产可以简单地从柠檬酸循环中提取琥珀酸盐或琥珀酰-CoA。