Abstract
Genes encoding enzymes with sequence similarity to carotenoid biosynthetic enzymes of other organisms were cloned fromStreptomyces griseus JA3933 and transformed into the colourless (non-daunorubicin producing) mutantStreptomyces griseus IMET JA3933/956/2. Cells harbouring these genes showed an orange-red pigmentation, caused by the strongly hydrophobic, membrane-bound lycopene. The cloned fragment (9 kb) contained seven genes, four transcribed in one direction (crtEIBV) and three (crtYTU) transcribed convergently to them. Three of these genes encode polypeptides that resemble geranylgeranyl-pyrophosphate (GGPP) synthases (CrtE), phytoene synthases (PS) (CrtB) and phytoene dehydrogenases (PDH) (CrtI), respectively, of various bacteria. These enzymes are sufficient for the formation of lycopene.crtE alone was sufficient to induce zeaxanthin formation in anEscherichia coli clone containing thecrt gene cluster fromErwinia herbicola deleted forcrtE. The combination ofcrtE andcrtB led to formation of phytoene inS. griseus. The putativecrtEp promoter region was cloned and mapped by primer extension analysis. In a gel retardation experiment, this fragment was specifically shifted by an unknown protein. CrtY shows similarity to lycopene cyclases that convert lycopene intoβ-carotene, CrtT resembles various methyltransferases and CrtU a dehydrogenase. We conclude that these genes are functionally intact, but not expressed (cryptic) in the wild-typeS. griseus strain.
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Communicated by J. W. Lengeler
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Schumann, G., Nürnberger, H., Krügel, H. et al. Activation and analysis of crypticcrt genes for carotenoid biosynthesis fromStreptomyces griseus . Molec. Gen. Genet. 252, 658–666 (1996). https://doi.org/10.1007/BF02173971
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DOI: https://doi.org/10.1007/BF02173971