TATA box binding protein induces structure in the recombinant glucocorticoid receptor AF1 domain

Raj Kumar, David E. Volk, Jianquan Li, James Lee, David G. Gorenstein, E. Brad Thompson

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

A number of transcription factor proteins contain domains that are fully or partially unstructured. The means by which such proteins acquire naturally folded conformations are not well understood. When they encounter their proper binding partner(s), several of these proteins adopt a folded conformation through an induced-fit mechanism. The glucocorticoid receptor (GR) is a ligand-activated transcription factor. Expressed independently as a recombinant peptide, the N-terminal transactivation domain (AF1) of the GR shows little structure and appears to exist as a collection of random coil configurations. The GR AF1 is known to interact with other transcription factors, including a critical component of the general transcription machinery proteins, the TATA box binding protein (TBP). We tested whether this interaction can lead to acquisition of structure in the GR AF1. Our results show that recombinant GR AF1 acquires a significant amount of helical content when it interacts with TBP. These structural changes were monitored by Fourier transform infrared and NMR spectroscopies, and by proteolytic digestions. Our results support a model in which TBP binding interaction with the GR AF1 induces significantly greater helical structure in the AF1 domain. This increased helical content in the GR AF1 appears to come mostly at the expense of random coil conformation. These results are in accordance with the hypothesis that an induced-fit mechanism gives structure to the GR AF1 when it encounters TBP.

Original languageEnglish (US)
Pages (from-to)16425-16430
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume101
Issue number47
DOIs
StatePublished - Nov 23 2004

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TATA-Box Binding Protein
Glucocorticoid Receptors
Transcription Factors
Proteins
Fourier Transform Infrared Spectroscopy
Protein Binding
Transcriptional Activation
Digestion
Magnetic Resonance Spectroscopy
Ligands
Peptides

Keywords

  • Coregulatory protein
  • Glucocorticoid receptor
  • N-terminal activation function
  • Protein folding

ASJC Scopus subject areas

  • Genetics
  • General

Cite this

TATA box binding protein induces structure in the recombinant glucocorticoid receptor AF1 domain. / Kumar, Raj; Volk, David E.; Li, Jianquan; Lee, James; Gorenstein, David G.; Thompson, E. Brad.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 101, No. 47, 23.11.2004, p. 16425-16430.

Research output: Contribution to journalArticle

Kumar, Raj ; Volk, David E. ; Li, Jianquan ; Lee, James ; Gorenstein, David G. ; Thompson, E. Brad. / TATA box binding protein induces structure in the recombinant glucocorticoid receptor AF1 domain. In: Proceedings of the National Academy of Sciences of the United States of America. 2004 ; Vol. 101, No. 47. pp. 16425-16430.
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