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:
Apr. 01, 1997
Filed:
Dec. 23, 1993
Dany Hadary, Richmond Hill, CA;
Daniel Bartfeld, North York, CA;
Michael J Butler, Beeton, CA;
David Jenish, Mississauga, CA;
Timothy Krieger, Brampton, CA;
Lawrence T Malek, Brampton, CA;
Gisela Soostmeyer, Kleinburg, CA;
Eva Walcyzk, Mississauga, CA;
Cangene Corporation, Mississauga, CA;
Abstract
A family of proteases endogenous to Streptomyces cells degrade 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 tripeprides 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.