The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 19, 1993
Filed:
Sep. 12, 1990
Herman A de Boer, Pacifica, CA (US);
Herbert L Heyneker, Burlingame, CA (US);
Peter H Seeburg, San Francisco, CA (US);
Genentech, Inc., South San Francisco, CA (US);
Abstract
Microbial expression of an exogenous polypeptide may be inefficient if the messenger RNA has secondary structure (due to complementarity of spaced regions of the molecule) which impedes interaction with a ribosome. The occurrence of such structure can be predicted. The degeneracy of the genetic code gives freedom to alter the nucleic acid composition of the CDNA to eliminate harmful secondary structure of the MRNA. For example, bovine growth hormone (BGH) is poorly expressed by E. coli transformed with a recombinant plasmid containing the natural BGH gene. The corresponding MRNA has complementary regions at 46-51 and 73-78. Therefore a plasmid PBGH 33-4 was constructed containing a BGH gene whose upstream portion was synthesized (making use of plasmid PHGH 207-1 which contains an efficiently expressible gene for the closely related human growth hormone) so as not to cause the troublesome complementarity. E. coli transformed therewith produced BGH with-a yield of better than 10.sup.5 copies per cell.