Abstract
The ability to purify cytochrome P450 from liver microsomes was the result of the collective efforts of a number of laboratories, borrowing from each others’ efforts and observatrons. Early efforts to solubrlize the hemoprotein from microsomes through the use of proteases were not successful, resulting merely in the solubilization of a number of other microsomal proteins. The breakthrough event was the solubrlizatron of rabbit liver microsomal cytochrome P450 using the ionic detergent, deoxycholate (1), allowing the monooxygenase system to be separated into three components, a reductase, a lipid-containing fraction and a cytochrome P450-containing fraction. Diethylammoethyl (DEAE)-chromatography was used in subsequent studies to purify further the phenobarbital-induced hemoprotem fraction (2) (later known as CYP2B4), and eventually polyethylene glycol precipitation was used to fractionate the microsomal proteins (3). Various induced forms of rat cytochrome P450 were likewise detergent-solubrhzed, using sodium cholate, and polyethylene glycol fractionated, and subjected to DEAE-chromatography with the added step of hydroxylapatite chromatography in the presence of nomonic detergent (4). Constitutive forms of cytochrome P450 were also isolated, using variatrons of these procedures, employing gentler nomonic detergents and a substrateliganded affinity column (5, 6). All of the procedures depend heavily upon the ability to selectively separate the proteins based upon differences in their abilities to bind to different column packing materials, Minor forms of cytochrome P450 can be separated by sequential passage of protein mixtures through an anion exchange column, a cation exchange column, an hydroxylapatite or hydrophobic column. Separatrons on molecular exclusion columns are not too
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Lu, A. and Coon, M. (1968) Role of hemoprotem P-450 in fatty acid w-hydroxylation in a soluble enzyme system from liver microsomes J Biol Chem 243, 1331,1332
Lu, A., Junk, K, and Coon, M. (1969) Resolution of the cytochrome P-450-containing w-hydroxylation system of liver microsomes into three components. J Biol Chem 244, 3114–3721
Haugen, D and Coon, M. (1976) Properties of electrophoretically homogeneous phenobarbital-inducible and B-naphthoflavone-inducible forms of liver microsomal cytochrome P-450. J Biol Chem 251, 7929–7939
Ryan, D., Thomas, P, and Levm, W. (1982) Purrfication and characterization of a minor form of hepatic microsomal cytochrome P-450 from rats treated with polychlorinated brphenyls Arch Biochem Blophys 216, 272–288.
Gibson, G. and Schenkman, J. (1978) Purification and properties of cytochrome P-450 obtained from liver microsomes of untreated rats by lauric acid affinity chromatography. J Biol. Chem 253, 5957–5963
Cheng, K.C. and Schenkman, J. (1982) Purification and characterization of two constitutive forms of rat liver microsomal cytochrome P-450 J. Biol Chem 257, 2378–2385.
Schenkman, J., Favreau, L., Mole, J, Kreutzer, D and Jansson, I (1987) Fingerprinting rat liver microsomal cytochromes P-450 as a means of delineating sexually distinctive forms. Arch Toxicol 60, 43–51
Tamburmi, P., White, R and Schenkman, J. (1985) Chemical characterization of protein-protein interactions between cytochrome P-450 and cytochrome b5 J Biol Chem 260, 4007–4015
Yasukochi, Y. and Masters, B (1976) Some properties of a detergent-solubilized NADPH-cytochrome c (cytochrome P-450) reductase purified by biospecific affinity chromatography J Biol Chem 251, 5337–5344
Jansson, I, Mole, J. and Schenkman, J. (1985) Purification and characterization of a new form (RLM2) of liver microsomal cytochrome P-450 from untreated rat. J Biol Chem 260, 7084–7093
Jansson, I., Tamburmi, P., Favreau, L. and Schenkman, J (1985) The Interaction of cytochrome b5 with four cytochrome P-450 enzymes from the untreated rat Drug Metab Drip 13, 453–458.
Favreau, L, Malchoff, D, Mole, J and Schenkman, J. (1987) Responses to insulin by two forms of rat hepatic microsomal cytochrome P-450 that undergo major (RLM6) and minor (RLM5b) elevations in diabetes. J Biol. Chem 262, 14,319–14,326
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1998 Humana Press Inc.
About this protocol
Cite this protocol
B. Schenkman, J., Jansson, I. (1998). Isolation and Purification of Constitutive Forms of Microsomal Cytochrome P450. In: Phillips, I.R., Shephard, E.A. (eds) Cytochrome P450 Protocols. Methods in Molecular Biology™, vol 107. Humana Press. https://doi.org/10.1385/0-89603-519-0:55
Download citation
DOI: https://doi.org/10.1385/0-89603-519-0:55
Publisher Name: Humana Press
Print ISBN: 978-0-89603-519-5
Online ISBN: 978-1-59259-580-8
eBook Packages: Springer Protocols