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Related Experiment Videos

H-2RIIBP expressed from a baculovirus vector binds to multiple hormone response elements.

M S Marks1, B Z Levi, J H Segars

  • 1Laboratory of Developmental and Molecular Immunity, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892.

Molecular Endocrinology (Baltimore, Md.)
|February 1, 1992
PubMed
Summary

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H-2RIIBP, a nuclear hormone receptor, binds to major histocompatibility complex class I genes and various hormone response elements. This suggests H-2RIIBP may have multiple functions in development and gene regulation.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • H-2RIIBP is a nuclear hormone receptor superfamily member.
  • It binds to the region II enhancer of major histocompatibility complex class I genes.
  • Homology with Drosophila XR2C/CF1 suggests a role in development.

Purpose of the Study:

  • To produce recombinant H-2RIIBP and characterize its DNA-binding specificity.
  • To investigate H-2RIIBP's interaction with various hormone response elements.
  • To determine the potential pleiotropic function of H-2RIIBP.

Main Methods:

  • Baculovirus expression system for recombinant H-2RIIBP production.
  • Generation of monoclonal antibodies against H-2RIIBP.
  • DNA-protein immunoprecipitation, Southwestern, and gel mobility shift assays.

Related Experiment Videos

  • Methylation interference assays to identify DNA-binding motif.
  • Main Results:

    • Recombinant H-2RIIBP was successfully produced and localized to the nucleus.
    • H-2RIIBP binds to estrogen response elements with high affinity.
    • It also binds to some thyroid hormone and retinoic acid response elements with lower affinity.
    • The conserved hormone response motif GG(T/A)CA was identified as the H-2RIIBP binding site.

    Conclusions:

    • H-2RIIBP binds to a variety of hormone response elements.
    • This binding occurs without exogenous ligand addition.
    • H-2RIIBP likely possesses a pleiotropic function, impacting multiple cellular processes.