Preliminary structural studies on the multi-ligand-binding domain of the transcription activator, BmrR, from Bacillus subtilis.

Journal Article (Journal Article)

In the bacterium Bacillus subtilis, the DNA-binding regulatory protein, BmrR, activates transcription from the multidrug transporter gene, bmr, after binding either rhodamine or tetraphenylphosphonium. These two compounds, which have no structural similarity, are also substrates for the bacterial multidrug transporter. BmrR belongs to the MerR family of transcription activators but differs from the other family members in its ability to bind unrelated small molecule activators. As an initial step in the elucidation of the mechanism by which BmrR recognizes rhodamine and tetraphenylphosphonium and activates transcription, we have crystallized the 144-amino acid-residue carboxy terminal dimerization/ligand-binding domain of the BmrR, named the BRC (BmrR C-terminus). Tetragonal crystals of ligand-free BRC take the space group P4(1)2(1)2, or its enantiomorph P4(3)2(1)2, with unit cell dimensions a = b = 76.3 A, c = 96.0 A, alpha = beta = gamma = 90 degrees. Diffraction is observed to at least 2.7 A resolution at room temperature. In addition, we determined the secondary structure content of ligand-free and rhodamine-bound BRC by circular dichroism. In the ligand-free form, BRC has considerable beta-sheet content (41%) and little alpha-helix structure (13%). After BRC binds rhodamine, its beta-sheet content increases to 47% while the alpha-helix structure decreases to 11%. The structure of BRC will provide insight not only into its multidrug recognition mechanism but could as well aid in the elucidation of the recognition and efflux mechanisms of Bmr and other bacterial multidrug transporters.

Full Text

Duke Authors

Cited Authors

  • Zheleznova, EE; Markham, PN; Neyfakh, AA; Brennan, RG

Published Date

  • November 1997

Published In

Volume / Issue

  • 6 / 11

Start / End Page

  • 2465 - 2468

PubMed ID

  • 9385651

Pubmed Central ID

  • PMC2143597

International Standard Serial Number (ISSN)

  • 0961-8368

Digital Object Identifier (DOI)

  • 10.1002/pro.5560061122


  • eng

Conference Location

  • United States