Crystal structure of MtaN, a global multidrug transporter gene activator.

Published

Journal Article

MtaN (Multidrug Transporter Activation, N terminus) is a constitutive, transcriptionally active 109-residue truncation mutant, which contains only the N-terminal DNA-binding and dimerization domains of MerR family member Mta. The 2.75 A resolution crystal structure of apo-MtaN reveals a winged helix-turn-helix protein with a protruding 8-turn helix (alpha5) that is involved in dimerization by the formation of an antiparallel coiled-coil. The hydrophobic core and helices alpha1 through alpha4 are structurally homologous to MerR family member BmrR bound to DNA, whereas one wing (Wing 1) is shifted. Differences between the orientation of alpha5 with respect to the core and the revolution of the antiparallel coiled-coil lead to significantly altered conformations of MtaN and BmrR dimers. These shifts result in a conformation of MtaN that appears to be incompatible with the transcription activation mechanism of BmrR and suggest that additional DNA-induced structural changes are necessary.

Full Text

Duke Authors

Cited Authors

  • Godsey, MH; Baranova, NN; Neyfakh, AA; Brennan, RG

Published Date

  • December 14, 2001

Published In

Volume / Issue

  • 276 / 50

Start / End Page

  • 47178 - 47184

PubMed ID

  • 11581256

Pubmed Central ID

  • 11581256

International Standard Serial Number (ISSN)

  • 0021-9258

Digital Object Identifier (DOI)

  • 10.1074/jbc.M105819200

Language

  • eng

Conference Location

  • United States