1. A process for preparing a diaryl carbonate, comprising:
(i) contacting an aromatic non-hydroxy compound with a carboxylic acid of formula
HOC(\u2550O)R1\u2003\u2003(I),
wherein R1 is a hydrocarbyl group, and with an oxygen containing gas in the presence of a catalyst, resulting in water and an aromatic carboxylic acid ester of formula
R2OC(\u2550O)R1\u2003\u2003(II),
wherein R2 is an aryl group originating from the aromatic non-hydroxy compound; and
(ii) contacting the aromatic carboxylic acid ester of formula (II) from step (i) with a dialkyl carbonate of formula
R3OC(\u2550O)OR4\u2003\u2003(III),
wherein R3 and R4 are the same or different and are alkyl groups, in the presence of a catalyst, resulting in a diaryl carbonate of formula
R2OC(\u2550O)OR2\u2003\u2003(IV)
and an alkyl carboxylic acid ester of formula
R5OC(\u2550O)R1\u2003\u2003(V),
wherein R5 is R3 or R4.
2. A process as claimed in claim 1, further comprising:
(iii) contacting the alkyl carboxylic acid ester of formula (V) from step (ii) with water, in the presence of a catalyst, resulting in the carboxylic acid of formula (I) and an alkanol of formula
R5OH\u2003\u2003(VI).
3. A process as claimed in claim 2, wherein the water from step (i) is sent to and used in step (iii).
4. A process as claimed in claim 2, wherein the carboxylic acid of formula (I) from step (iii) is sent to and used in step (i).
5. A process as claimed in claim 2, wherein the alkanol of formula (VI) is sent to and used in a process for the preparation of the dialkyl carbonate of formula (III) from said alkanol and an alkylene carbonate.
6. A process as claimed in claim 5, wherein the alkylene carbonate is propylene carbonate or ethylene carbonate.
7. A process as claimed in claim 5, wherein the alkylene carbonate is prepared by reacting an alkylene oxide with carbon dioxide.
8. A process as claimed in claim 7, wherein the alkylene oxide is propylene oxide or ethylene oxide.
9. A process as claimed in claim 7, wherein the carbon dioxide comprises carbon dioxide which is formed as a by-product in step (i).
10. A process as claimed in claim 1, wherein the aromatic non-hydroxy compound is benzene, the aromatic carboxylic acid ester of formula (II) is a phenyl carboxylic acid ester of formula (II) wherein R2 is a phenyl group and the diaryl carbonate of formula (IV) is diphenyl carbonate.
11. A process as claimed in claim 1, wherein R1 in the carboxylic acid of formula (I) is a C1-C10 alkyl group, preferably a methyl, ethyl or propyl group.
12. A process as claimed in claim 11, wherein the carboxylic acid of formula (I) is acetic acid and the aromatic carboxylic acid ester of formula (II) is an aromatic acetate of formula (II) wherein R1 is a methyl group.
13. A process as claimed in claim 12, wherein the aromatic non-hydroxy compound is benzene, the aromatic carboxylic acid ester of formula (II) is phenyl acetate and the diaryl carbonate of formula (IV) is diphenyl carbonate.
14. A process as claimed in claim 1, wherein R3 and R4 in the dialkyl carbonate of formula (III) are the same and are a C1-C10 alkyl group, preferably a C1-C4 alkyl group, and more preferably a methyl, ethyl, n-propyl or isopropyl group.
15. A process as claimed in claim 14, wherein the dialkyl carbonate of formula (III) is diethyl carbonate and the alkyl carboxylic acid ester of formula (V) is an ethyl carboxylic acid ester of formula (V) wherein R5 is an ethyl group.
16. A process as claimed in claim 15, wherein the aromatic non-hydroxy compound is benzene, the aromatic carboxylic acid ester of formula (II) is phenyl acetate, the diaryl carbonate of formula (IV) is diphenyl carbonate and the alkyl carboxylic acid ester of formula (V) is ethyl acetate.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed is:
1. An eukaryotic host cell genetically engineered to express a gene for a protein of interest and an IGF-1-signaling pathway gene.
2. The host cell of claim 1 wherein the IGF-1-signaling pathway gene is selected from the group consisting of a PKB gene, a MEK1 gene, a MEK2 gene, a glut5 gene, a glut1 gene, an ERK1 gene, an ERK2 gene, a JNK gene, a 14-3-3 protein gene, an IRS gene, and a P13 kinase gene.
3. The host cell of claim 2 wherein the IGF-1-signaling pathway gene is expressed under control of a heterologous regulatory element.
4. The host cell of claim 3, wherein the heterologous regulatory element is a viral promoter.
5. The host cell of claim 4, wherein the viral promoter is selected from the group consisting of a CMV promoter, an SV40 promoter, an RSV promoter and an adenoviral promoter.
6. The host cell of claim 1, wherein the protein of interest is selected from the group consisting of a soluble TNF receptor, a soluble IL-4 receptor, a soluble IL-1 type II receptor, a soluble Flt3 ligand, a soluble CD40 ligand, CD39, CD30, CD27, a TEKOrk, IL-15, a soluble IL-15 receptor, Ox 40, GM-CSF, RANKL, RANK, TRAIL, a soluble TRAIL receptor, tissue plasminogen activator, Factor VIII, Factor IX, apolipoprotein E, apolipoprotein A-I, an IL-2 receptor, an IL-2 antagonist, alpha-1 antitrypsin, calcitonin, growth hormone, insulin, insulinotropin, insulin-like growth factors, parathyroid hormone, interferons, superoxide dismutase, glucagon, an erythropoeitin, an antibody, glucocerebrosidase, an Fc-fusion protein, globins, nerve growth factors, interleukins, colony stimulating factors, and immune response modifiers.
7. The host cell of claim 1, wherein the host cell is further genetically engineered to express a first selectable marker.
8. The host cell of claim 7, wherein the gene encoding the selectable marker is adjacent to the IGF-1-signaling pathway gene.
9. The host cell of claim 1, wherein the host cell is a mammalian cell.
10. The host cell of claim 9, wherein the host cell is selected from the group consisting of CHO, VERO, BHK, HeLa, CV1, MDCK, 293, 3T3, myeloma, PC12 and WI38 cells.
11. The host cell of claim 1, wherein the host cell is adapted to grow in serum-free medium.
12. The host cell of claim 11, wherein the host cell is a CHO cell and the IGF-1-signaling pathway gene is PKB.
13. The host cell of claim 11, wherein the host cell is a CHO cell and the IGF-1-signaling pathway gene is MEK.
14. The host cell of claim 1, wherein the host cell is genetically engineered to express a second IGF-1-signaling pathway gene.
15. The host cell of claim 14, wherein the IGF-1-signaling pathway gene is selected from the group consisting of PKB, MEK, ERK1 and ERK2.
16. A method of producing a protein of interest, the method comprising culturing an eukaryotic host cell genetically engineered to express a gene for a protein of interest and an IGF-1-signaling pathway gene under conditions such that the protein of interest is expressed.
17. The method of claim 16, wherein the IGF-1-signaling pathway gene is selected from the group consisting of a PKB gene, a MEK1 gene, a MEK2 gene, a glut5 gene, a glut1 gene, an ERK1 gene, an ERK2 gene, a JNK gene, a 14-3-3 protein gene, an IRS-1 gene, and a PI3 kinase gene.
18. The method of claim 16, further comprising collecting the protein of interest.
19. The method of claim 16, wherein the IGF-1-signaling pathway gene is expressed under control of a heterologous regulatory element.
20. The method of claim 19, wherein the heterologous regulatory element is a viral promoter.
21. The method of claim 20, wherein the viral promoter is selected from the group consisting of a CMV promoter, an SV40 promoter, an RSV promoter and an adenoviral promoter.
22. The method of claim 16, wherein the protein of interest is selected from the group consisting of a soluble TNF receptor, a soluble IL-4 receptor, a soluble IL-1 type II receptor, a soluble Flt3 ligand, a soluble CD40 ligand, CD39, CD30, CD27, a TEKOrk, IL-1 5, a soluble IL-15 receptor, Ox 40, GM-CSF, RANKL, RANK, TRAIL, a soluble TRAIL receptor, tissue plasminogen activator, Factor VIII, Factor IX, apolipoprotein E, apolipoprotein A-I, an IL-2 receptor, an IL-2 antagonist, alpha-1 antitrypsin, calcitonin, growth hormone, insulin, insulinotropin, insulin-like growth factors, parathyroid hormone, interferons, superoxide dismutase, glucagon, an erythropoeitin, an antibody, glucocerebrosidase, an Fc-fusion protein, globins, nerve growth factors, interleukins, colony stimulating factors, and immune response modifiers.
23. The method of claim 16, wherein the host cell is further genetically engineered to express a first selectable marker.
24. The method of claim 23, wherein the gene encoding the selectable marker is adjacent to the IGF-1-signaling pathway gene.
25. The method of claim 16, wherein the host cell is a mammalian cell.
26. The method of claim 25, wherein the host cell is selected from the group consisting of CHO, VERO, BHK, HeLa, CV1, MDCK, 293, 3T3, myeloma, PC12 and W138 cells.
27. The method of claim 16, wherein the host cell is cultured in serum-free medium.
28. The method of claim 27, wherein the medium is growth-factor free.
29. The method of claim 27, wherein the medium is protein-free.
30. The method of claim 29, wherein the medium is peptone-free.
31. The method of claim 16, wherein the host cell is a CHO cell and the IGF-1-signaling pathway gene is PKB.
32. The method of claim 16, wherein the host cell is a CHO cell and the IGF-1-signaling pathway gene is MEK.
33. The method of claim 16, wherein the host cell is genetically engineered to express a second IGF-1-signaling pathway gene.
34. The method of claim 33, wherein the IGF-1-signaling pathway gene is selected from the group consisting of PKB, MEK, ERK1 and ERK2.
35. A method of producing an eukaryotic cell for production of a protein of interest, the method comprising genetically engineering an eukaryotic cell to express a gene that encodes a protein of interest, and to express an IGF-1-signaling pathway gene.
36. A method of producing a mammalian cell line capable of growth in serum-free medium, the method comprising exposing cells that have been genetically engineered to overexpress an IGF-1 signaling pathway gene to serum-free medium, and isolating a cell line that grows in serum-free medium.
37. The method of claim 36, further comprising exposing the cells to peptone-free medium, and isolating a cell line that grows in peptone-free medium.
38. The method of claim 36, further comprising exposing the cells to protein-free medium, and isolating a cell line that grows in protein-free medium.
39. The method of any one of claims 36 to 38, wherein the IGF-1 signaling pathway gene is a PKB gene.
40. The method of any one of claims 36 to 38, wherein the IGF-1 signaling pathway gene is a MEK gene.
41. The method of any one of claims 36 to 38, wherein the cell is genetically engineered to overexpress at least two IGF-1 signaling pathway genes.
42. The method of claim 41, wherein the IGF-1 signaling pathway genes are selected from the group consisting of a PKB gene, a MEK gene, and a MAPK gene.
43. A method of producing an eukaryotic cell for production of a protein of interest, the method comprising genetically engineering an eukaryotic cell to express a protein of interest, wherein the eukaryotic cell has been genetically engineered to express an IGF-1 signaling pathway gene.
44. A method of producing an eukaryotic cell for production of a protein of interest, the method comprising genetically engineering an eukaryotic cell to express an IGF-1 signaling pathway gene, wherein the eukaryotic cell expresses a protein of interest.