5ICQ

Methanobactin periplasmic binding protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.157 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Methanobactin transport machinery.

Dassama, L.M.Kenney, G.E.Ro, S.Y.Zielazinski, E.L.Rosenzweig, A.C.

(2016) Proc.Natl.Acad.Sci.USA 113: 13027-13032

  • DOI: 10.1073/pnas.1603578113

  • PubMed Abstract: 
  • Methanotrophic bacteria use methane, a potent greenhouse gas, as their primary source of carbon and energy. The first step in methane metabolism is its oxidation to methanol. In almost all methanotrophs, this chemically challenging reaction is cataly ...

    Methanotrophic bacteria use methane, a potent greenhouse gas, as their primary source of carbon and energy. The first step in methane metabolism is its oxidation to methanol. In almost all methanotrophs, this chemically challenging reaction is catalyzed by particulate methane monooxygenase (pMMO), a copper-dependent integral membrane enzyme. Methanotrophs acquire copper (Cu) for pMMO by secreting a small ribosomally produced, posttranslationally modified natural product called methanobactin (Mbn). Mbn chelates Cu with high affinity, and the Cu-loaded form (CuMbn) is reinternalized into the cell via an active transport process. Bioinformatic and gene regulation studies suggest that two proteins might play a role in CuMbn handling: the TonB-dependent transporter MbnT and the periplasmic binding protein MbnE. Disruption of the gene that encodes MbnT abolishes CuMbn uptake, as reported previously, and expression of MbnT in Escherichia coli confers the ability to take up CuMbn. Biophysical studies of MbnT and MbnE reveal specific interactions with CuMbn, and a crystal structure of apo MbnE is consistent with MbnE's proposed role as a periplasmic CuMbn transporter. Notably, MbnT and MbnE exhibit different levels of discrimination between cognate and noncognate CuMbns. These findings provide evidence for CuMbn-protein interactions and begin to elucidate the molecular mechanisms of its recognition and transport.


    Organizational Affiliation

    Department of Molecular Biosciences, Northwestern University, Evanston, IL 60208.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Methylocystis parvus OBBP MbnE
A
610N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.157 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 122.200α = 90.00
b = 141.500β = 90.00
c = 83.100γ = 90.00
Software Package:
Software NamePurpose
XSCALEdata scaling
BALBESphasing
PHENIXrefinement
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesF32GM110934
National Science Foundation (United States)United StatesMCB0842366

Revision History 

  • Version 1.0: 2016-10-26
    Type: Initial release
  • Version 1.1: 2016-11-30
    Type: Database references
  • Version 1.2: 2017-09-27
    Type: Author supporting evidence, Database references