Regulation of genetic activity by thyroid hormones. II. Specificity of interaction of cytoplasmic thyroxine receptor isolated from human embryonal fibroblasts and Hela cells with DNA
Abdukarimov, A.; Guliamova, T.G.; Aripdzhanov, A.A.; Khan, M.Z.
Problemy Endokrinologii 27(2): 66-70
1981
ISSN/ISBN: 0375-9660 PMID: 6262749 Document Number: 176662
The work concerns a new approach to evaluating the receptor and hormone-receptor complex specific interaction with DNA and revealing the cause of the absence of the hormone-receptor complex acceptation with HeLa cell chromosomes. It has been shown that hormone-receptor complexing should precede specific interaction with DNA. The purified receptor-thyroxin complex is saturatable and specifically competes with Hae III restrictase, protecting specific sites of DNA recognition from this enzyme. Specificity of the hormone-receptor complex interaction with DNA depends on the sequences surrounding Hae III restriction site. The HeLa cell hormone-receptor complex does not interact with the recognition site for the normal hormone-receptor complex.