title: STUDIES ON THE MODE OF ACTION OF DIPHTHERIA TOXIN. II. EFFECT OF TOXIN ON AMINO ACID INCORPORATION IN CELL-FREE SYSTEMS.
abstract: It has been demonstrated that low concentrations of highly purified diphtheria toxin specifically inhibit incorporation of labeled amino acids into polypeptides in extracts from HeLa cells and from rabbit reticulocytes. No inhibition of incorporation occurs in the absence of a specific cofactor. This cofactor has been identified as nicotinamide adenine dinucleotide (NAD). It has been shown that it is one of the steps involving transfer of amino acids from soluble ribonucleic acid to the growing polypeptide chain that is affected by the toxin in the presence of NAD.
mesh_terms: D000596:Amino Acids; D000818:Animals; D002247:Carbon Isotopes; D002384:Catalysis; D002474:Cell-Free System; D004167:Diphtheria Toxin; D056890:Eukaryota; D006367:HeLa Cells; D006801:Humans; D007930:Leucine; D009243:NAD; D009249:NADP; D010455:Peptides; D010600:Pharmacology; D011506:Proteins / Q000378:metabolism*; D012313:RNA; D011817:Rabbits; D011874:Radiometry; D012106:Research; D012156:Reticulocytes; D012260:Ribonucleases; D046509:Tissue Culture Techniques; D014020:Tissue Extracts; D014116:Toxicology; D014500:Uracil Nucleotides
chemical_list: D000596:Amino Acids; D002247:Carbon Isotopes; D004167:Diphtheria Toxin; D010455:Peptides; D011506:Proteins; D014020:Tissue Extracts; D014500:Uracil Nucleotides; D009243:NAD; D009249:NADP; D012313:RNA; D012260:Ribonucleases; D007930:Leucine
keywords: ALGAE; CARBON ISOTOPES; CATALYSIS; DIPHTHERIA TOXIN; EXPERIMENTAL LAB STUDY; LEUCINE; NAD; NADP; PEPTIDES; PHARMACOLOGY; PROTEIN METABOLISM; RADIOMETRY; RETICULOCYTES; RIBONUCLEASE; RNA, SOLUBLE; TISSUE CULTURE; TISSUE EXTRACTS; TOXICOLOGIC REPORT; URACIL NUCLEOTIDES