title: Light-dependent cytochrome P-450 changes in mung beans (Phaseolus aureus).
abstract: Maximum concentrations of microsomal cytochrome P-450 are present in 3-4 day-old mung beans (Phaseolus aureus). On illumination of dark-grown seedlings, cytochrome P-450 and later cytochrome P-450 undergo a rapid decrease in concentration in vivo, with an apparent half-time of about 6 h. Conversely light-grown seedlings, transferred to darkness, show a slow accumulation of cytochrome P-450, doubling time of about 30 h, with a later accumulation of cytochrome P-420. Microsomal cytochromes b559, b560.5 and b562.5 do not significantly alter on light-dark transitions. Possible functions for dark-induced cytochrome P-450 are discussed.
mesh_terms: D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism*; D003573:Cytochrome b Group; D003580:Cytochromes / Q000378:metabolism; D007887:Fabaceae / Q000201:enzymology; D008027:Light; D008861:Microsomes / Q000201:enzymology / Q000528:radiation effects; D010944:Plants / Q000201:enzymology* / Q000528:radiation effects; D010946:Plants, Medicinal; D013997:Time Factors
chemical_list: D003573:Cytochrome b Group; D003580:Cytochromes; C013464:cytochrome P420; D003577:Cytochrome P-450 Enzyme System