C - Chemistry – Metallurgy – 12 – N
Patent
C - Chemistry, Metallurgy
12
N
195/1.2, 195/1.2
C12N 15/81 (2006.01) C12N 1/19 (2006.01) C12N 15/29 (2006.01) C12N 15/68 (2006.01)
Patent
CA 1312838
ABSTRACT OF THE DISCLOSURE According to the present invention, there is provided a shortened PGK promoter of the PGK gene com- prising less than 500 base pairs of the proximal end of the 5' region of the PGK gene. The invention also provides for vehicles capable of replication and expression comprising said shortened PGK promoter operably linked to a structural gene and operably linked to a secretion signal linked to a structural gene, and also provides for hosts transformed with the vehicle. In one embodiment of the invention disclosed, the shortened PGK promoter is used with a process for reg- ulating yeast plasmid copy number by two selectable markers, the first marker having normal or high level expression from its promoter, the second marker, leu2-d, having low level expression from its promoter. Expression of a structural gene on this plasmid system can be increased by lowering the level of the second metabolite (leucine) in the growth medium, thereby selecting for an increased copy number of the second selectable marker (leu2-d), and therefore increased plasmid copy number, which in turn increases the num- ber of copies of the structural gene being expressed.
523097
Blair Lindley
Horwitz Arnold
Koduri Raju Kanaka
Lee Jar-How
Mbm & Co.
Xoma Corporation
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