title: Regulation of crystal protein biosynthesis by Bacillus thuringiensis: II. Effects of carbon and nitrogen sources.
abstract: The regulation of crystal protein production in Bacillus thuringiensis 81 by sources of carbon and nitrogen was investigated. The highest titers of toxin were obtained on sucrose, lactose and inulin which also supported sporulation. Whey and molasses were also potential carbon substrates for toxin production. Other carbohydrates including glucose, glycerol, maltose, starch and dextrin yielded lower amounts of toxin. Nitrogen sources were found to exert the most profound controls. Peptone was the best organic nitrogen source, supporting optimum production and sporulation as well as high cell density. The formation of CryI and CryII toxin proteins was found to be differentially regulated by the inorganic nitrogenous compounds incorporated into the medium.
authors.affiliation: Middle East Technical University, Department of Biology, Ankara, 06531, Turkey.
authors.forename: Yasemin
authors.initials: Y
authors.lastname: Içgen
authors.forename: Bülent
authors.initials: B
authors.lastname: Içgen
authors.forename: Gülay
authors.initials: G
authors.lastname: Ozcengiz
mesh_terms: D001413:Bacillus thuringiensis / Q000378:metabolism*; D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins / Q000096:biosynthesis* / Q000378:metabolism; D001427:Bacterial Toxins / Q000096:biosynthesis* / Q000378:metabolism; D050260:Carbohydrate Metabolism; D002244:Carbon / Q000378:metabolism*; D004731:Endotoxins / Q000096:biosynthesis* / Q000378:metabolism; D006460:Hemolysin Proteins; D007306:Insecticides / Q000378:metabolism*; D009584:Nitrogen / Q000378:metabolism*; D010461:Peptones / Q000378:metabolism; D013171:Spores, Bacterial / Q000378:metabolism
chemical_list: D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins; D001427:Bacterial Toxins; D004731:Endotoxins; D006460:Hemolysin Proteins; D007306:Insecticides; D010461:Peptones; C030956:insecticidal crystal protein, Bacillus Thuringiensis; D002244:Carbon; D009584:Nitrogen