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JBC, Vol. 251, Issue 23, 7281-7288, Dec, 1976

Human epidermal transglutaminase. Preparation and properties

H. Ogawa and L. A. Goldsmith

A transglutaminase from human hair follicle-free epidermis was purified to homogeneity using gel filtration and ion exchange chromatography. The enzyme had an apparent Mr = 51,000 +/- 2,000 by sodium dodecyl sulfate electrophoresis, 100,000 +/- 5,000 by discontinuous gel electrophoresis, and 50,000 +/- 2,000 by gel filtration in Bio-Gel A-0.5m agarose. The enzyme cross-linked Factor XIII-free fibrinogen forming gamma dimers and alpha polymers. Either calcium or strontium was necessary for enzyme activity. In the presence of calcium, enzyme activity was increased by heating at 56 degrees or by treating with dimethylsulfoxide. Activation required calcium and occurred in the presence of serine protease inhibitors. The activated and native enzyme had apparently identical mobilities in acrylamide disc electrophoresis and sodium dodecyl sulfate electrophoresis. The Km values for two substrates in the reaction, casein and putrescine, were very similar for the native and the activated enzyme. The activated enzyme had a larger elution volume on Bio-Gel A-0.5m in the presence of calcium than did the native enzyme. The detailed mechanism of activation remains to be determined.
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