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:
Jan. 05, 1999
Filed:
Jun. 24, 1994
Daniel Bartfeld, North York, CA;
Michael J Butler, Cambridge, GB;
Dany Hadary, Richmond Hill, CA;
David L Jenish, Mississauga, CA;
Timothy J Krieger, Brampton, CA;
Lawrence T Malek, Brampton, CA;
Gisela Soostmeyer, Kleinburg, CA;
Eva Walczyk, Mississauga, CA;
Phyllis Krygsman, Bolton, CA;
Sheila Garven, Oakville, CA;
Cangene Corporation, Winnipeg, CA;
Abstract
A family of proteases endogenous to Streptomyces cells degrades heterologous proteins secreted from Streptomyces host cells. The previously unidentified proteases include (1) tripeptidyl aminopeptidase--Streptomyces ('Tap'), (2) a Streptomyces protease ('Ssp') which displayed significant amino acid sequence homology to Subtilisin BPN' and showed an ability to remove tripeptides from the amino termini of proteins and peptides, and (3) other proteases derived from Streptomyces which degraded certain substrates under certain conditions. Degradation was alleviated by selective inhibition of secreted proteases or by using hosts with impaired capabilities to produce proteases. An irreversible inhibitor was designed based upon the mechanism and substrate specificity of the target protease. Hosts secreting high amounts of proteases were selected. Impaired hosts were produced by deleting or altering the nucleotide sequence for the proteases.