GENETICALLY ENGINEERED MICROBES AND METHODS FOR PRODUCING CITRAMALATE

    公开(公告)号:US20190093135A1

    公开(公告)日:2019-03-28

    申请号:US16086883

    申请日:2017-03-21

    IPC分类号: C12P7/46 C12N9/10

    摘要: Provided herein is a genetically engineered microbe which accumulates citramalate. In one embodiment, the microbe includes an exogenous polynucleotide encoding a citramalate synthase which catalyzes the condensation of acetyl CoA and pyruvic acid. Optionally, the microbe also includes a second exogenous polynucleotide encoding a citrate synthase which catalyzes the condensation of acetyl CoA and oxaloacetate, and the citrate synthase activity in the microbe is reduced compared to a control microbe. In one embodiment, the citrate synthase includes at least one amino acid substitution in the acetyl-CoA binding pocket, the mobile loop, the NADH binding site, and the oxaloacetate binding site, or a combination thereof. Also provided herein are methods for using the genetically engineered microbe, including a method for producing citramalate. The method can further include isolating the citramalate.

    METHODS OF PRESERVING A MICROALGAE BIOMASS AND A PRESERVED MICROALGAE BIOMASS

    公开(公告)号:US20180305656A1

    公开(公告)日:2018-10-25

    申请号:US15495625

    申请日:2017-04-24

    IPC分类号: C12N1/12 C12P7/46 C12N1/20

    CPC分类号: C12N1/12 C12N1/20 C12P7/46

    摘要: A method of preserving a biomass. The method comprises adding an acid solution to a biomass comprising microalgae to form an acidified microalgae biomass composition. The acidified microalgae biomass composition is stored under anaerobic conditions without inoculating the acidified microalgae biomass composition with bacteria. An additional method of preserving a biomass comprises storing the acidified microalgae biomass composition under anaerobic conditions and exposing the acidified microalgae biomass composition to carbon dioxide, nitrogen, or a combination thereof to produce a coproduct comprising succinic acid. Yet another method of preserving a biomass comprises storing the acidified microalgae biomass composition under anaerobic conditions and in the presence of carbon dioxide. A preserved biomass is also disclosed.