Regulation of secondary metabolism in higher plants. Effect of alkaloids on a cytochrome p-450 dependent monooxygenase (Record no. 48294)

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Transcribing agency CICY
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Classification number (OCLC) (R) ; Classification number, CALL (RLIN) (NR) B-14099
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Title Regulation of secondary metabolism in higher plants. Effect of alkaloids on a cytochrome p-450 dependent monooxygenase
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Volume/sequential designation BioChemical and Biophysical Research Communications, 66(4), p.1263-1269, 1975
520 3# - SUMMARY, ETC.
Summary, etc. An end-product indole alkaloid, catharanthine, inhibits a membranebound cytochrome P-450 dependent monooxygenase of the higher plant, Vinca rosea. Kinetic analysis revealed the alkaloid to be a reversible, linear, non-competitive inhibitor (Ki=l mM)with resp.ect to its substrates, geraniol and NADPH. Comparable inhibition of the solubilised monooxygenase by catharanthine tends to exclude a mechanism based upon disruption of membrane organization. On the basis of its inhibition of solubilized hydroxylase in the presence and absence of sodium cholate, it is also unlikely that catharanthine competes for putative phospholipid binding site(s). Two additional end-product alkaloids, vinblastine and vindoline were less inhibitory. Since the hydroxylase catalyzes one of the first committed steps in the biosynthesis of indole alkaloids, these observations suggest feedback control of the pathway by catharanthine.
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Mcfarlane, J.
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Madyastha, K.M.
700 12 - ADDED ENTRY--PERSONAL NAME
Personal name Coscia, Carmine J.
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  Clasificación local     Ref1 CICY CICY Documento préstamo interbibliotecario 25.06.2025   B-14099 25.06.2025 25.06.2025 Documentos solicitados