PMID: 1201750Jul 1, 1975Paper

Cytochrome components of plant microsomes

European Journal of Biochemistry
P R Rich, D S Bendall

Abstract

The electron transport components of the microsomal fraction of cauliflower buds and mung bean hypocotyls were investigated using split-beam and dual wavelength spectrophotometry under a variety of reducing conditions. Cauliflower microsomes were found to contain an ascorbate-reducible component, termed cytochrome b-559.5 [E'0 = +135 +/- 20 mV; lambdamax (reduced minus oxidised) = 559.5, 527 and 429 nm at 23 degrees C], cytochrome b5 [E'0 = -20 +/- 20 mV; lambdamax (reduced minus oxidised) = 556, 526 and 425 nm at 23 degrees C], cytochromes P-450 and P-420. On the basis of binding studies with ethyl isocyanide, degradation of cytochrome P-450 to P-420, redox potential, aniline binding, and relative rates of reduction by NADPH and NADH, it is suggested that the cytochrome P-450 system is analogous to that mammalian microsomes. Other components, reducible only by dithionite, may also be present. Mung bean microsomes were found to contain an ascorbate-reducible component, termed cytochrome b-562 [E'0 = +120 +/- 20 mV; lambdamax (reduced minus oxidised) = 562, 528 and 430 nm at 23 degrees C], cytochrome b5, and a low potential component which was reducible only by sodium dithionite. No cytochrome P-450 or P-420 could be detected. A...Continue Reading

References

Aug 21, 1973·Biochemical and Biophysical Research Communications·T D Meehan, C J Coscia
May 1, 1972·Archives of Biochemistry and Biophysics·M R Waterman, H S Mason
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May 1, 1966·Plant Physiology·H E KasinskyD P Hackett

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Citations

Feb 1, 1988·Mutation Research·J Velemínský, T Gichner
Jan 1, 1989·Comparative Biochemistry and Physiology. C, Comparative Pharmacology and Toxicology·J T Borlakoglu, P John
Nov 1, 1992·Plant Physiology·M Simontacchi, S Puntarulo
Jun 1, 1984·Plant Physiology·C M Chen, S M Leisner
Jul 1, 1989·Plant Physiology·H AsardJ A De Greef
Nov 1, 1975·European Journal of Biochemistry·P R RichD S Bendall
Dec 1, 1978·Environmental Health Perspectives·R A Nilan
Jan 1, 1981·Drug Metabolism Reviews·D R Dohn, R I Krieger
Jul 1, 1990·Xenobiotica; the Fate of Foreign Compounds in Biological Systems·S CottrellD V Parke
Aug 15, 1983·European Journal of Biochemistry·M L HagmannH Grisebach
Nov 1, 1982·Bulletin of Environmental Contamination and Toxicology·K HigashiY Karasaki
Dec 1, 1994·Phytochemistry·G P BolwellA Zimmerlin
Apr 29, 1986·Biochemical and Biophysical Research Communications·K M Madyastha, N Krishnamachary
Apr 15, 1982·Archives of Biochemistry and Biophysics·D B Hicks, R P Donaldson

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