Purification and characterization of three male-specific and one female-specific forms of cytochrome p-450 from rat liver microsomes

Tatsumi Matsumoto, Yoshikazu Emi, Shun-Ichiro Kawabata, Tsuneo Omura

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Abstract

Three forms of cytochrome P-450, tentatively designated P-450(M-1), P-450(M-2), and P-450(M-3), and one form of cytochrome P-450, P-450(F-1), were purified from the liver microsomes of untreated male and female rats, respectively. Each purified form of the cytochrome showed a single protein band on SDS-polyacrylamide gel electrophoresis, and gave a minimum molecular weight of 51,000 for P-450M-1), 48,000 for P-450(M-2), 49,000 for P-450(M-3), and 50,000 for P450(F-1). The carbon monoxide-difference spectra of reduced P-450(M-1), P-450(M-2), P-450(M-3), and P-450(F-1) showed an absorption maximum at 451, 451, 448, and 449 nm, respectively. Judging from the absolute absorption spectra, the four forms of cytochrome P-450 were of low-spin type in the oxidized forms. The antibodies against P450(M-2) did not crossreact with the other forms in the Ouchterlony double diffusion test, whereas the immunodiffusion test showed immunocrossreactivity between P-450(M-1) and P-450(F-1), P-450(M-1) and P-450(M-3), and P-450(M-3) and P-450(F-1). The NH2-terminal amino acid sequences of the four forms confirmed that they were different molecular species, although significant homology was noticed among P-450(M-1), P-450(M-3), and P-450(F-1). The quantitation of P-450(M-1) and P-450(F-1) in liver microsomes by quantitative immunoprecipitation confirmed that these two forms of cytochrome P-450 were developmentally induced in male and female rats, respectively. P-450(M-2) was also developmentally induced in male rats. In a reconstituted system containing NADPH and NADPH-cytochrome P-450 reductase, P-450(M-1) oxidized benzphetamine at a high rate, whereas the other forms had low activity toward benzphetamine. None of the four forms showed high activity toward benzo(a)pyrene. P-450(M-1) catalyzed the hydroxylation of testosterone at the 16α and 2α positions, whereas P-450(M-2) catalyzed the 15α hydroxylation of the same substrate.

Original languageEnglish
Pages (from-to)1359-1371
Number of pages13
JournalJournal of Biochemistry
Volume100
Issue number5
DOIs
Publication statusPublished - Jan 1 1986

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Liver Microsomes
Cytochromes
Liver
Cytochrome P-450 Enzyme System
Purification
Rats
Benzphetamine
Hydroxylation
NADPH-Ferrihemoprotein Reductase
Immunodiffusion
Benzo(a)pyrene
Carbon Monoxide
Electrophoresis
NADP
Immunoprecipitation
Testosterone
Polyacrylamide Gel Electrophoresis
Absorption spectra
Amino Acid Sequence
Molecular Weight

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology

Cite this

Purification and characterization of three male-specific and one female-specific forms of cytochrome p-450 from rat liver microsomes. / Matsumoto, Tatsumi; Emi, Yoshikazu; Kawabata, Shun-Ichiro; Omura, Tsuneo.

In: Journal of Biochemistry, Vol. 100, No. 5, 01.01.1986, p. 1359-1371.

Research output: Contribution to journalArticle

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abstract = "Three forms of cytochrome P-450, tentatively designated P-450(M-1), P-450(M-2), and P-450(M-3), and one form of cytochrome P-450, P-450(F-1), were purified from the liver microsomes of untreated male and female rats, respectively. Each purified form of the cytochrome showed a single protein band on SDS-polyacrylamide gel electrophoresis, and gave a minimum molecular weight of 51,000 for P-450M-1), 48,000 for P-450(M-2), 49,000 for P-450(M-3), and 50,000 for P450(F-1). The carbon monoxide-difference spectra of reduced P-450(M-1), P-450(M-2), P-450(M-3), and P-450(F-1) showed an absorption maximum at 451, 451, 448, and 449 nm, respectively. Judging from the absolute absorption spectra, the four forms of cytochrome P-450 were of low-spin type in the oxidized forms. The antibodies against P450(M-2) did not crossreact with the other forms in the Ouchterlony double diffusion test, whereas the immunodiffusion test showed immunocrossreactivity between P-450(M-1) and P-450(F-1), P-450(M-1) and P-450(M-3), and P-450(M-3) and P-450(F-1). The NH2-terminal amino acid sequences of the four forms confirmed that they were different molecular species, although significant homology was noticed among P-450(M-1), P-450(M-3), and P-450(F-1). The quantitation of P-450(M-1) and P-450(F-1) in liver microsomes by quantitative immunoprecipitation confirmed that these two forms of cytochrome P-450 were developmentally induced in male and female rats, respectively. P-450(M-2) was also developmentally induced in male rats. In a reconstituted system containing NADPH and NADPH-cytochrome P-450 reductase, P-450(M-1) oxidized benzphetamine at a high rate, whereas the other forms had low activity toward benzphetamine. None of the four forms showed high activity toward benzo(a)pyrene. P-450(M-1) catalyzed the hydroxylation of testosterone at the 16α and 2α positions, whereas P-450(M-2) catalyzed the 15α hydroxylation of the same substrate.",
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N2 - Three forms of cytochrome P-450, tentatively designated P-450(M-1), P-450(M-2), and P-450(M-3), and one form of cytochrome P-450, P-450(F-1), were purified from the liver microsomes of untreated male and female rats, respectively. Each purified form of the cytochrome showed a single protein band on SDS-polyacrylamide gel electrophoresis, and gave a minimum molecular weight of 51,000 for P-450M-1), 48,000 for P-450(M-2), 49,000 for P-450(M-3), and 50,000 for P450(F-1). The carbon monoxide-difference spectra of reduced P-450(M-1), P-450(M-2), P-450(M-3), and P-450(F-1) showed an absorption maximum at 451, 451, 448, and 449 nm, respectively. Judging from the absolute absorption spectra, the four forms of cytochrome P-450 were of low-spin type in the oxidized forms. The antibodies against P450(M-2) did not crossreact with the other forms in the Ouchterlony double diffusion test, whereas the immunodiffusion test showed immunocrossreactivity between P-450(M-1) and P-450(F-1), P-450(M-1) and P-450(M-3), and P-450(M-3) and P-450(F-1). The NH2-terminal amino acid sequences of the four forms confirmed that they were different molecular species, although significant homology was noticed among P-450(M-1), P-450(M-3), and P-450(F-1). The quantitation of P-450(M-1) and P-450(F-1) in liver microsomes by quantitative immunoprecipitation confirmed that these two forms of cytochrome P-450 were developmentally induced in male and female rats, respectively. P-450(M-2) was also developmentally induced in male rats. In a reconstituted system containing NADPH and NADPH-cytochrome P-450 reductase, P-450(M-1) oxidized benzphetamine at a high rate, whereas the other forms had low activity toward benzphetamine. None of the four forms showed high activity toward benzo(a)pyrene. P-450(M-1) catalyzed the hydroxylation of testosterone at the 16α and 2α positions, whereas P-450(M-2) catalyzed the 15α hydroxylation of the same substrate.

AB - Three forms of cytochrome P-450, tentatively designated P-450(M-1), P-450(M-2), and P-450(M-3), and one form of cytochrome P-450, P-450(F-1), were purified from the liver microsomes of untreated male and female rats, respectively. Each purified form of the cytochrome showed a single protein band on SDS-polyacrylamide gel electrophoresis, and gave a minimum molecular weight of 51,000 for P-450M-1), 48,000 for P-450(M-2), 49,000 for P-450(M-3), and 50,000 for P450(F-1). The carbon monoxide-difference spectra of reduced P-450(M-1), P-450(M-2), P-450(M-3), and P-450(F-1) showed an absorption maximum at 451, 451, 448, and 449 nm, respectively. Judging from the absolute absorption spectra, the four forms of cytochrome P-450 were of low-spin type in the oxidized forms. The antibodies against P450(M-2) did not crossreact with the other forms in the Ouchterlony double diffusion test, whereas the immunodiffusion test showed immunocrossreactivity between P-450(M-1) and P-450(F-1), P-450(M-1) and P-450(M-3), and P-450(M-3) and P-450(F-1). The NH2-terminal amino acid sequences of the four forms confirmed that they were different molecular species, although significant homology was noticed among P-450(M-1), P-450(M-3), and P-450(F-1). The quantitation of P-450(M-1) and P-450(F-1) in liver microsomes by quantitative immunoprecipitation confirmed that these two forms of cytochrome P-450 were developmentally induced in male and female rats, respectively. P-450(M-2) was also developmentally induced in male rats. In a reconstituted system containing NADPH and NADPH-cytochrome P-450 reductase, P-450(M-1) oxidized benzphetamine at a high rate, whereas the other forms had low activity toward benzphetamine. None of the four forms showed high activity toward benzo(a)pyrene. P-450(M-1) catalyzed the hydroxylation of testosterone at the 16α and 2α positions, whereas P-450(M-2) catalyzed the 15α hydroxylation of the same substrate.

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