Purified mixture of collagenase I, collagenase II and two other proteases
First Claim
1. An enzyme composition prepared by combining defined amounts of proteases said composition comprising collagenase I and collagenase II from C. histolyticum, having an A280 /A360 ratio of greater than 30 and two other proteases, wherein the ratio of the mass of collagenase II to the mass of collagenase I plus the mass of the collagenase II in the composition is about 0.3 to about 0.6.
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Accused Products
Abstract
A purified enzyme mixture useful for isolating cells or cell clusters from tissue is disclosed. The mixture includes at least two collagenase enzymes, at least two other proteases, and additional non-protease components. The mixture is purified by removing at least some of the non-protease components. The purified mixture may then be used to isolate cells or cell clusters from tissue. Also disclosed are the essential components of the purified enzyme mixture as well as preferred ranges and ratios of these essential components for isolating cells or cell clusters from tissue. Finally, a dissociation system is disclosed that can be used with the purified enzyme mixture to dissociate tissue and recover cells or cell clusters.
59 Citations
21 Claims
- 1. An enzyme composition prepared by combining defined amounts of proteases said composition comprising collagenase I and collagenase II from C. histolyticum, having an A280 /A360 ratio of greater than 30 and two other proteases, wherein the ratio of the mass of collagenase II to the mass of collagenase I plus the mass of the collagenase II in the composition is about 0.3 to about 0.6.
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20. A method of preparing an enzyme composition adapted for isolating living cells from tissue, said method comprising the steps of combining collagenase I, collagenase II, and clostripain from C. histolyticum wherein the ratio of the mass of collagenase II to the mass of collagenase I plus the mass of collagenase II is about 0.3 to about 0.6;
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adding an amount of a neutral protease sufficient to raise the total FITC casein activity of the enzyme composition to a level such that the ratio of the total FITC casein activity of the enzyme composition to the total Wunsch unit activity of the masses of collagenase I and collagenase II in the enzyme composition is about 19;
1 to about 70;
1. - View Dependent Claims (21)
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Specification