Synchrony of Long Duration in Suspension Cultures of Mammalian Cells

THE high-sulphur proteins of α-keratins, which constitute the non-filamentous matrix between the microfibrils, comprise several major groups of proteins, each group consisting of a number of closely related components. They are obtained in a soluble form by reduction of the disulphide bonds of wool and preferential extraction with alkaline thioglycollate at high ionic strength¹. The thiol groups are subsequently stabilized by alkylation with iodoacetic acid.     

3-Hydroxyanthranilic acid metabolism. IV. Spectrophotometric evidence for the formation of an intermediate

Evidence has been presented for the formation of an intermediate compound in the metabolism of 3-hydroxyanthranilic acid to quinolinic acid by 3-hydroxyanthranilase from rat liver preparations. The production of the intermediate was demonstrated by spectrophotometric analyses and quinolinic acid measurements of incubation mixtures in which small amounts of acetone powder extracts of rat liver were used as the enzyme source. The calculated extinction coefficient of the compound was more than double that of the substrate or of the final product, quinolinic acid.The intermediate was shown to be an oxidation product of 3-hydroxyanthranilate as indicated by Thunberg experiments. The data obtained indicate that the intermediate may be a quinone-type compound.