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. 1976 May 1;155(2):255–263. doi: 10.1042/bj1550255

Neutral proteinases of human spleen. Purification and criteria for homogeneity of elastase and cathepsin G.

P M Starkey, A J Barrett
PMCID: PMC1172830  PMID: 7244

Abstract

1. Human spleen was found to contain proteinases active against azo-casein at neutral and alkaline pH values. 2. The activity was stimulated by high ionic strength and some detergents. 3. Optimal extraction of the proteinases from the tissue was achieved with 1.0M-NaCl containing 0.1% Brij 35 and 0.1% trisodium EDTA. 4. The proteinases were efficiently adsorbed to insoluble material in the absence of salt in the initial stages of purification. 5. Two distinct proteinases were separated by chromatography on DEAE-cellulose, an elastase and a chymotrypsin-like enzyme designated cathepsin G. 6. Both enzymes were highly purified by further column chromatography. 7. The molecular weights of the enzymes were estimated by gel chromatography and sodium dodecyl sulphate-gel electrophoresis. 8. It was shown by isoelectric focusing and gel electrophoresis that both enzymes are cationic proteins that occur in multiple forms.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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