Studies on the Crystalline Catalase

The Molecular Weight of Crystalline Catalase.

In 1933 Stern (2) used the diffusion method of Northrop and Anson (3) to determine the molecular weights of purified catalase from horse liver, pig liver, cow liver, horse kidney, and cow erythrocytes. He found the average value for the molecular weight of catalase to be 68,900, and stated that the catalase molecule has a dimension similar to that of hemoglobin. In 1938 Stern and Wyckoff (4) pu...

Studies on Crystalline Urease

1. Crystalline urease is not inactivated by trypsin in the absence of a gum. In fact, the presence of trypsin alone in aqueous solutions of urease has an action similar to that of gum, that is, it acts as a "protective colloid" for urease. 2. Crystalline urease is inactivated by trypsin in the presence of a gum. This occurs with great rapidity if purified (crystalline) trypsin is used. 3. If tr...

Studies on the Effect of Temperature on the Catalase Reaction. Ii. Loss of Catalase Activity

In the preceding paper (1) the possibility of spontaneous inactivation of the enzyme by heat has been mentioned as a factor responsible for the diminished catalase activity, especially at temperatures above 20°C. To determine to what extent this may have played a r61e in the experiments at different temperatures, the activity of catalase subjected for various lengths of time to the influence of...

Studies on the Inactivation of Catalase Iii. Destruction of Catalase by Hydrogen Peroxide by Sergius Morgulis

X-ray Diffraction Studies on Crystalline Complexes

Complexes of the gene 5 protein with a variety of oligodeoxynucleotides, ranging in length from two to eight and having several different sequences, have been formed and crystallized for x-ray diffraction analysis. The crystallographic parameters of four different unit cells, all of which are based on hexagonal packing arrangements, indicate that the fundamental unit of the complex is composed ...