Transglutaminase in the rat lung is tightly associated with the insoluble matrix which is not extractable with detergent, 0.5 M NaCl, and 40% glycerol solutions. The insoluble matrix was found to be rich in heparin sulfate and poor in collagen, elastin, and DNA. The lung transglutaminase was found to be distinct from tissue transglutaminase (identifiable with the well-characterized guinea pig l...

Early in the development of spores, there appears in gill tissue of the mushroom Agaricus bisporus a red pigment that inhibits mitochondrial respiration. The inhibitor and its immediate precursor were isolated from the mushroom and identified as gamma-L-glutaminyl 3,4-benzoquinone (I) and gamma-L-glutaminyl 4-hydroxybenzene (II), respectively, neither of which had previously been described. II ...

A methyl methanesulfonate sensitive mutant of Bacillus subtilis appears to lack the enzyme DNA polymerase I. The absence of polymerase I permits the detection of a second DNA polymerizing enzyme in the mutant. This second polymerase is inhibitable by sulfhydryl antagonists, and shows maximal activity on double-stranded DNA substrates with many single strand breaks. Poly[d(A-T)] is less efficien...

An enzyme, 5’-hydroxyl polyribonucleotide kinase, which catalyzes the phosphorylation of 5’-hydroxyl ends of RNA in the presence of ATP, has been isolated from extracts of HeLa cell nuclei. The kinase requires a divalent cation (Mg’+ or Mn’+) for activity, has an alkaline pH optimum, and is sensitive to the sulfhydryl antagonist N-ethylmaleimide. 5’-Hydroxyl terminated polydeoxyribonucleotides ...

An enzyme, 5'-hydroxyl polyribonucleotide kinase, which catalyzes the phosphorylation of 5'-hydroxyl ends of RNA in the presence of ATP, has been isolated from extracts of HeLa cell nuclei. The kinase requires a divalent cation (Mg2+ or Mn2+) for activity, has an alkaline pH optimum, and is sensitive to the sulfhydryl antagonist N-ethylmaleimide. 5'-hydroxyl terminated polydeoxyribonucleotides ...

The presence of a previously unidentified enzyme, tentatively designated 5-methylthioribose kinase, has been demonstrated in cell-free extracts of Enterobacter aerogenes. The enzyme catalyzes the ATP-dependent phosphorylation of 5-methylthioribose. ADP is one of the products of the reaction and, based on functional group analyses, the other product is 5-methylthioribose 1-phosphate. A 40-fold p...

Cereal Chem. 72(l):58-64 A dynamic rheometer was used to characterize the effect of glutathione, interchange. Addition of potassium bromate to dough resulted an increase potassium bromate, and two ascorbic acid isomers on the rheological in G'and a decrease in loss tangent. L-threoascorbic acid was rheologically properties of wheat flour doughs. During resting after mixing (dough more effective...

Previous studies have shown the existence of an autonomous mitochondrial UDP-glucose: dolichylmonophosphate glucosyltransferase, located in mitochondrial outer membrane of liver cells. To improve our knowledge about the topographical aspects of glycosylation in mitochondria, we have investigated the organization of this enzyme in intact mitochondria, using controlled proteolysis with trypsin an...

Phosphatidylethanolamine synthesis by CDP-ethanolamine:1,2-diacylglycerol ethanolaminephosphotransferase (EC 2.7.8.1) from the endoplasmic reticulum of castor bean (Ricinus communis L. var. Hale) endosperm was characterized. The Michaelis-Menten constant of the enzyme for CDP-ethanolamine was approximately 8.0 micromolar. The pH optimum was 6.5 and a divalent cation was an absolute requirement ...

Mercury is an environmental poison, and the damage to living system is generally severe. The severity of mercury poisoning is consequent from the fact that it targets the thiol-containing enzymes, irreversibly oxidizing their critical thiol groups, consequently leading to an inactivation of the enzyme. The Na⁺/K⁺-ATPase is a sulfhydryl protein that is sensitive to Hg²⁺ assault. On the other han...