METHODS, COMPOSITIONS AND SYSTEMS FOR BIOSYNTHETIC BIO-PRODUCTION OF 1,4 BUTANEDIOL
Three biosynthetic pathways are disclosed for microorganism bio-production of 1,4-Butanediol from various carbon sources. Exemplary methods are provided. The recombinant microorganisms comprising any of these 1,4-Butanediol biosynthesis pathways may also comprise genetic modifications directed to improved tolerance for 1,4-Butanediol.
1 . A recombinant microorganism adapted to biosynthesize 1,4-butanediol (“1,4-BDO”), the recombinant microorganism comprising one or more nucleic acid sequences encoding one or more of 1) a first polypeptide providing acetyl-CoA acetyltransferase activity, 2) a second polypeptide providing β-hydroxybutyryl-CoA dehydrogenase activity; 3) a third polypeptide providing crotonase activity; a 4) fourth polypeptide providing vinylacetyl-CoA-A-isomerase and 4-hydroxybutyryl-CoA dehydratase activities; 5) a fifth polypeptide providing 4-hydroxybutyrate-CoA-hydrolase activity, and 6) a sixth polypeptide providing 1,3-propanediol dehydrogenase activity, wherein the recombinant microorganism biosynthesizes 1,4-BDO utilizing said polypeptides.
2 . The recombinant microorganism of claim 1 , wherein the one or more nucleic acid sequences comprise at least one of thiL, hbd, crt, abfD, abfT, and dhaT.
3 . The recombinant microorganism of claim 1 or 2 , wherein the recombinant microorganism is adapted to biosynthesize 1,4-BDO by condensing two acetyl-CoA moieties into acetoacetyl-CoA.
4 . The recombinant microorganism of claim 3 , comprising aldehyde dehydrogenase.
5 . The recombinant microorganism of claim 1 , comprising all said polypeptides.
6 . A recombinant microorganism adapted to biosynthesize 1,4-butanediol (“1,4-BDO”), the recombinant microorganism comprising one or more nucleic acid sequences encoding one or more of 1) a first polypeptide providing a-ketoglutarate decarboxylase activity, 2) a second polypeptide providing 4-hydroxybutyrate dehydrogenase activity, and 3) a third polypeptide providing 1,3-propanediol dehydrogenase activity, wherein the recombinant microorganism biosynthesizes 1,4-BDO utilizing said polypeptides.
7 . The recombinant microorganism of claim 6 , wherein the one or more nucleic acid sequences comprise at least one of kgd, 4hbd, and dhaT.
8 . The recombinant microorganism of claim 6 or 7 wherein the recombinant microorganism is adapted to biosynthesize 1,4-BDO from citrate, wherein the citrate is derived from oxaloacetate and acetyl-CoA.
9 . The recombinant microorganism of claim 8 , comprising:
aconitase, isocitrate dehydrogenase, aldehyde dehydrogenase, and methylcitrate synthase; or
aconitase, isocitrate dehydrogenase, aldehyde dehydrogenase, and citrate synthase.
10 . The recombinant microorganism of claim 6 , comprising all said polypeptides.
11 . A recombinant microorganism adapted to biosynthesize 1,4-butanediol (“1,4-BDO”), the recombinant microorganism comprising one or more nucleic acid sequences encoding one or more of 1) a first polypeptide providing fumarase activity, 2) a second polypeptide providing fumarate reductase activity, 3) a third polypeptide providing succinate semialdehyde dehydrogenase activity, 4) a fourth polypeptide providing one or both of succinyl-CoA synthetase activity and succinate semialdehyde dehydrogenase activity, 5) a fifth polypeptide providing 4-hydroxybutyrate dehydrogenase activity, 6) a sixth polypeptide providing aldehyde dehydrogenase activity, and 7) a seventh polypeptide providing 1,3-propanediol dehydrogenase activity, wherein the recombinant microorganism biosynthesizes 1,4-BDO utilizing said polypeptides.
12 . The recombinant microorganism of claim 11 , wherein the one or more nucleic acid sequences comprise at least one of fumA, fumB, fumC, frd, yneI, sucC, sucD, 4hbD, adh, and dhaT.
13 . The recombinant microorganism of claim 11 or 12 wherein the recombinant microorganism is adapted to biosynthesize 1,4-BDO from malate, wherein the malate is derived from oxaloacetate and/or from pyruvate.
14 . The recombinant microorganism of claim 13 , comprising fumarase, succinate semialdehyde dehydrogenase, and aldehyde dehydrogenase.
15 . The recombinant microorganism of claim 13 , comprising fumarase, succinyl-CoA synthetase, and aldehyde dehydrogenase.
16 . The recombinant microorganism of claim 11 , comprising all said polypeptides.
17 . A recombinant microorganism according to any of the preceding claims wherein the microorganism is any of the microorganisms identified in the present specification.
18 . A recombinant microorganism according to any of the preceding claims wherein a nucleic acid sequence encoding one of the indicated polypeptides selectively hybridizes with one of the nucleic acid sequences of SEQ ID NOs: 0001 to 0007, and 0012.
19 . A recombinant microorganism according to any of the preceding claims wherein a polypeptide encoded by a nucleic acid sequence has at least a 90% homology with a polypeptide encoded by the respective stated gene sequence.
20 . A recombinant microorganism according to any of the preceding claims wherein a polypeptide encoded by a nucleic acid sequence has at least a 95% homology with a polypeptide encoded by the respective stated gene sequence.
21 . The recombinant microorganism of any preceding claim, wherein at least one of the one or more nucleic acid sequences is heterologous.
22 . A method of biosynthesis of 1,4-BDO comprising providing in a bioreactor vessel a microorganism of any of the preceding claims, a carbon source, and a media, and conducting a bio-production event under suitable conditions and for a suitable time to obtain a measurable quantity of 1,4-BDO.
23 . A method of biosynthesis of any of the identified downstream products of 1,4-BDO comprising practicing the method of claim 22 and thereafter practicing a method for conversion of 1,4-BDO to one of said identified downstream products.
24 . The method of claim 23 wherein the method for conversion comprises esterification or ester exchange reaction.
25 . The method of claim 23 wherein the method for conversion comprises dehydration under acidic conditions to form tetrahydrofuran.
26 . A bio-production system comprising a bioreactor vessel, a microorganism of any of the preceeding claims, a carbon source, and a media, wherein the system is adapted to conduct a bio-production event under suitable conditions and for a suitable time to produce a measurable quantity of 1,4-BDO.
27 . An industrial-scale microbial bioreactor system comprising:
(a) a bioreactor vessel;
(b) a carbon source;
(c) a recombinant microorganism of any of claims 1 - 20 ; and
(d) a media.
28 . The industrial-scale microbial bioreactor system of claim 27 , wherein the media is a minimal media.
29 . The industrial-scale microbial bioreactor of claim 27 , wherein the media is a minimal salts media wherein the minimal salts media is one of M9 minimal media, potassium sulfate minimal media, yeast synthetic minimal media and variations thereof.
30 . The industrial-scale microbial bioreactor of claim 27 , wherein the carbon source is a sugar.
31 . The industrial-scale microbial bioreactor of claim 30 , wherein the sugar is sucrose, glucose, xylose, cellulose or hemixellulose.