A novel NADPH-dependent cytosolic 3,5,3'-triiodo-L-thyronine-binding protein (CTBP; 5.1S) in rat liver: a comparison with 4.7S NADPH-dependent CTBP.

Abstract:

:A novel NADPH-dependent cytosolic 3,5,3'-triiodo-L-thyronine (T3)-binding protein (CTBP) was purified by sequential fractionation of rat liver cytosol on Q-Sepharose, phenyl-Sepharose, red-Sepharose, and polyacrylamide gel electrophoresis under nondenaturing conditions. The CTBP had a sedimentation coefficient of 5.1S, a Stokes' radius of 35 A, and a calculated mol wt of 76,000. The apparently homogenous protein consisted of a dimer of a polypeptide chain with a mol wt of 38,000 as estimated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. NADPH increased both the affinity and maximal binding capacity for T3 in the 5.1S CTBP. The maximal activity to bind T3 was obtained by 3.0 x 10(-8) M NADPH. The calculated maximal affinity constant was 2.4 x 10(9) M-1, and the maximal binding capacity was 21,000 pmol T3/mg 5.1S CTBP. The order of affinity of iodothyronine analogs to the 5.1S CTBP was as follows: D-T3 greater than L-T3 greater than L-T4 greater than triiodothyroacetic acid. The optimal pH for T3 binding was 7.2-7.5. Ca2+, Mg2+, and Mn2+ (0.1-10 mM) did not influence T3 binding to CTBP. Zn2+ (1.0 mM), however, inhibited the binding. These results suggested that 5.1S NADPH-dependent CTBP, which is distinct from 4.7S CTBP that had been purified in our laboratory from rat kidney, is present in rat liver.

journal_name

Endocrinology

journal_title

Endocrinology

authors

Kobayashi M,Hashizume K,Suzuki S,Ichikawa K,Takeda T

doi

10.1210/endo-129-4-1701

subject

Has Abstract

pub_date

1991-10-01 00:00:00

pages

1701-8

issue

4

eissn

0013-7227

issn

1945-7170

journal_volume

129

pub_type

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