5D1R

Crystal structure of Mycobacterium tuberculosis Rv1816 transcriptional regulator.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.180 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structural Basis for the Regulation of the MmpL Transporters of Mycobacterium tuberculosis.

Delmar, J.A.Chou, T.H.Wright, C.C.Licon, M.H.Doh, J.K.Radhakrishnan, A.Kumar, N.Lei, H.T.Bolla, J.R.Rajashankar, K.R.Su, C.C.Purdy, G.E.Yu, E.W.

(2015) J Biol Chem 290: 28559-28574

  • DOI: 10.1074/jbc.M115.683797
  • Primary Citation of Related Structures:  
    5D1R, 5D1W

  • PubMed Abstract: 
  • The mycobacterial cell wall is critical to the virulence of these pathogens. Recent work shows that the MmpL (mycobacterial membrane protein large) family of transporters contributes to cell wall biosynthesis by exporting fatty acids and lipidic elements of the cell wall ...

    The mycobacterial cell wall is critical to the virulence of these pathogens. Recent work shows that the MmpL (mycobacterial membrane protein large) family of transporters contributes to cell wall biosynthesis by exporting fatty acids and lipidic elements of the cell wall. The expression of the Mycobacterium tuberculosis MmpL proteins is controlled by a complex regulatory network, including the TetR family transcriptional regulators Rv3249c and Rv1816. Here we report the crystal structures of these two regulators, revealing dimeric, two-domain molecules with architecture consistent with the TetR family of regulators. Buried extensively within the C-terminal regulatory domains of Rv3249c and Rv1816, we found fortuitous bound ligands, which were identified as palmitic acid (a fatty acid) and isopropyl laurate (a fatty acid ester), respectively. Our results suggest that fatty acids may be the natural ligands of these regulatory proteins. Using fluorescence polarization and electrophoretic mobility shift assays, we demonstrate the recognition of promoter and intragenic regions of multiple mmpL genes by these proteins. Binding of palmitic acid renders these regulators incapable of interacting with their respective operator DNAs, which will result in derepression of the corresponding mmpL genes. Taken together, these experiments provide new perspectives on the regulation of the MmpL family of transporters.


    Organizational Affiliation

    From the Departments of Physics and Astronomy and Chemistry, Iowa State University, Ames, Iowa 50011, ewyu@iastate.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Rv1816 transcriptional regulatorA, B239Mycobacterium tuberculosis CDC1551Mutation(s): 0 
Gene Names: MT1864
UniProt
Find proteins for P9WMC9 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WMC9 
Go to UniProtKB:  P9WMC9
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.180 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 40.444α = 90
b = 86.533β = 90
c = 129.87γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-09-30
    Type: Initial release
  • Version 1.1: 2015-10-07
    Changes: Database references
  • Version 1.2: 2015-12-02
    Changes: Database references
  • Version 1.3: 2017-11-22
    Changes: Database references, Derived calculations, Refinement description