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The isolation and characterization of specific 3-methylcholanthrene-binding proteins from rat liver cytosol.

Abstract：

:The major proteins to which 3-methylcholanthrene specifically binds have been purified over 480-fold with a 45% yield compared to a rat liver 100,000g supernate. The procedure involved a batch ion-exchange technique together with hydrophobic gel filtration and chromatofocusing chromatography. The multiple, specific 3-methylcholanthrene-binding proteins obtained from this protocol had apparent isoelectric points of pH 6.3, 6.0, 5.7, and 5.5 on elution from a chromatofocusing column. They all shared a common sedimentation coefficient as determined by sucrose gradient analysis of 4.4 S. Gel filtration on Sephadex G-75 gave a common Stokes radius of 27 A. An analysis of these chromatofocusing peaks by sodium dodecyl sulfate-polyacrylamide gel electrophoresis showed those which eluted at pH 6.3 and 6.0 to contain two major protein bands of Mr 32,000 and 34,000, together with several contaminating proteins. In contrast, the peaks from chromatofocusing which eluted at pH 5.7 and 5.5 contained three major proteins of Mr 40,000, 25,000, and 14,000. The specific binding capability of these chromatofocusing peaks was found to be unstable to temperatures of -30 degrees C and below. Competition studies showed that these proteins were not steroid receptors, and that only polycyclic aromatic hydrocarbons which could induce cytochrome P-450c were able to displace 3-methylcholanthrene from the binding site. A marked preference was noted for polycyclic aromatic hydrocarbons with four to five benzene rings arranged in a nonlinear fashion, suggesting the stereochemical requirements of the protein binding site. The stability of the noncovalent interaction between the proteins and 3-methylcholanthrene was in the range of pH 7 to 9.

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

Tierney B,Munzer S,Bresnick E

doi

10.1016/0003-9861(83)90095-4

subject

Has Abstract

pub_date

1983-09-01 00:00:00

pages

826-35

issue

2

eissn

0003-9861

issn

1096-0384

pii

0003-9861(83)90095-4

journal_volume

225

pub_type

杂志文章

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