Methods and organisms for utilizing synthesis gas or other gaseous carbon sources and methanol
View Patent ↗The invention provides a non-naturally occurring microbial organism having an acetyl-CoA pathway and the capability of utilizing syngas or syngas and methanol. In one embodiment, the invention provides a non-naturally occurring microorganism, comprising one or more exogenous proteins conferring to the microorganism a pathway to convert CO, CO 2 and/or H 2 to acetyl-coenzyme A (acetyl-CoA), methyl tetrahydrofolate (methyl-THF) or other desired products, wherein the microorganism lacks the ability to convert CO or CO 2 and H 2 to acetyl-CoA or methyl-THF in the absence of the one or more exogenous proteins. For example, the microbial organism can contain at least one exogenous nucleic acid encoding an enzyme or protein in an acetyl-CoA pathway. The microbial organism is capable of utilizing synthesis gases comprising CO, CO 2 and/or H 2 , alone or in combination with methanol, to produce acetyl-CoA. The invention additionally provides a method for producing acetyl-CoA, for example, by culturing an acetyl-CoA producing microbial organism, where the microbial organism expresses at least one exogenous nucleic acid encoding an acetyl-CoA pathway enzyme or protein in a sufficient amount to produce acetyl-CoA, under conditions and for a sufficient period of time to produce acetyl-CoA.
1. A non-naturally occurring microorganism, comprising exogenous proteins conferring to said microorganism a pathway to convert CO, CO 2 or H 2 , or a combination thereof, to methyl-tetrahydrofolate (methyl-THF), wherein said exogenous proteins are carbon monoxide dehydrogenase, formate dehydrogenase, formyl-tetrahydrofolate synthetase, methenyl-tetrahydrofolate cyclohydrolase, methylene-tetrahydrofolate dehydrogenase and methylene-tetrahydrofolate reductase, whereby expression of said exogenous proteins increases the efficiency of producing methyl-THF from CO, CO 2 or H 2 , or a combination thereof.
2. The microorganism of claim 1 , wherein said microorganism lacks the ability to convert CO, CO 2 or H 2 , or a combination thereof, to methyl-THF in the absence of said exogenous proteins.
3. The microorganism of claim 1 , wherein said microorganism converts CO 2 to methyl-THF.
4. The microorganism of claim 3 , wherein said microorganism converts CO to methyl-THF.
5. The microorganism of claim 3 , wherein said microorganism converts CO 2 and H 2 to methyl-THF.
6. The microorganism of claim 3 , wherein said microorganism converts CO and H 2 to methyl-THF.
7. The microorganism of claim 3 , wherein said microorganism converts CO 2 , CO and H 2 to methyl-THF.
8. The microorganism of claim 3 , wherein said microorganism is in a substantially anaerobic culture medium.
9. A method for producing methyl-THF, comprising culturing the microorganism of claim 1 under conditions and for a sufficient period of time to produce methyl-THF.
10. The method of claim 9 , wherein said microorganism is in a substantially anaerobic culture medium.
11. The method of claim 9 , wherein said microorganism is cultured in the presence of CO 2 , CO, or H 2 , or a combination thereof.
12. The method of claim 9 , wherein said microorganism lacks the ability to convert CO, CO 2 or H 2 , or a combination thereof, to methyl-THF in the absence of said exogenous proteins.
13. The method of claim 9 , wherein said microorganism converts CO 2 to methyl-THF.
14. The method of claim 9 , wherein said microorganism converts CO to methyl-THF.
15. The method of claim 9 , wherein said microorganism converts CO 2 and H 2 to methyl-THF.
16. The method of claim 9 , wherein said microorganism converts CO and H 2 to methyl-THF.
17. The method of claim 9 , wherein said microorganism converts CO 2 , CO and H 2 to methyl-THF.