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This version published online on October 17, 2002
Molecular Endocrinology, doi:10.1210/me.2002-0258
A more recent version of this article appeared on January 1, 2003
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Submitted on July 23, 2002
Accepted on September 23, 2002

Transactivation Functions of the N-terminal Domains of Nuclear Hormone Receptors: Protein Folding and Coactivator interactions

RAJ KUMAR1 and E. BRAD THOMPSON1*

1 Department of Human Biological Chemistry & Genetics, University of Texas Medical Branch, Galveston, TX-77555.

* To whom correspondence should be addressed. E-mail: bthompso{at}utmb.edu.

The N-terminal domains (NTDs) of many members of the nuclear hormone receptor (NHR) family contain potent transcription-activating functions (AFs). Knowledge of the mechanisms of action of the NTD AFs has lagged, compared with that concerning other important domains of the NHRs. In part, this is because the NTD AFs appear to be unfolded when expressed as recombinant proteins. Recent studies have begun to shed light on the structure and function of the NTD AFs. Recombinant NTD AFs can be made to fold by application of certain osmolytes or when expressed in conjunction with a DNA-binding domain (DBD) by binding that DBD to a DNA response element. The sequence of the DNA binding site may affect the functional state of the AFs domain. If properly folded, NTD AFs can bind certain cofactors and primary transcription factors. Through these, and/or by direct interactions the NTD AFs may interact with the AF2 domain in the ligand binding, carboxy-terminal portion of the NHRs. We propose models for the folding of the NTD AFs and their protein:protein interactions.


Key words: activation function-1 • nuclear hormone receptor • coactivators • transcription factor • N-terminal domain

NURSA Molecule Pages Link:

Nuclear Receptors:   RARα  |  ERα  |  GR  |  PR  |  AR
Coregulators:   CBP  |  p300  |  SRC-1  |  GRIP1



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