Chemistry: molecular biology and microbiology – Enzyme – proenzyme; compositions thereof; process for... – Lyase
Patent
1991-07-02
1992-12-08
Robinson, Douglas W.
Chemistry: molecular biology and microbiology
Enzyme , proenzyme; compositions thereof; process for...
Lyase
435850, 4352521, C12N 988
Patent
active
051697726
ABSTRACT:
The present invention is an improved process for purification of active heparinase and heparinase like enzymes from Gram negative organisms, in particular, Flavobacterium heparinum. The primary advantage of the process is the fact that it allows large scale processing and high yield of heparinase. The heparinase is released from the periplasmic space of the organism by osmotic shock treatment, first into an osmotically stabilized medium, secondly into a non-stabilized medium having a pH of approximately pH 6.0 and 8.6 with subsequent release into a second non-stabilized medium containing approximately 0.15 M sodium chloride, followed by fractionation by cation exchange chromatography, and, optionally, electropheresis or gel filtration chromatography. Two proteins having heparinase activity have been isolated, one having a molecular weight of approximately 42,000 Daltons and the other having a molecular weight of 65,000 to 75,000 Daltons.
Also described is the construction of a library for screening for the genes encoding the proteins having heparinase activity and two assay for detecting organisms producing heparinase, either F. heparinum or genetically engineered organisms.
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Cooney Charles L.
Zimmerman Joseph J.
Knode Marian C.
Massachusetts Institute of Technology
Robinson Douglas W.
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