6OQH

Solution NMR structure of a quiet outer membrane protein G Nanopore (OmpG mutant: Delta-L6-D215)


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Quiet Outer Membrane Protein G (OmpG) Nanopore for Biosensing.

Sanganna Gari, R.R.Seelheim, P.Liang, B.Tamm, L.K.

(2019) ACS Sens 4: 1230-1235

  • DOI: 10.1021/acssensors.8b01645

  • PubMed Abstract: 
  • Interest in nanopore technology has been growing due to nanopores' unique capabilities in small molecule sensing, measurement of protein folding, and low-cost DNA and RNA sequencing. The E. coli β-barrel outer membrane protein OmpG is an excellent al ...

    Interest in nanopore technology has been growing due to nanopores' unique capabilities in small molecule sensing, measurement of protein folding, and low-cost DNA and RNA sequencing. The E. coli β-barrel outer membrane protein OmpG is an excellent alternative to other protein nanopores because of its single polypeptide chain. However, the flexibility of its extracellular loops ultimately limits applications in traditional biosensing. We deleted several residues in and near loop 6 of OmpG. The dynamic structure of the new construct determined by NMR shows that loops 1, 2, 6, and 7 have reduced flexibilities compared to those of wild-type. Electrophysiological measurements show that the new design virtually eliminates flickering between open and closed states across a wide pH range. Modification of the pore lumen with a copper chelating moiety facilitates detection of small molecules. As proof of concept, we demonstrate concurrent single-molecule biosensing of glutamate and adenosine triphosphate.


    Organizational Affiliation

    Department of Molecular Physiology and Biological Physics , Center for Cell and Membrane Physiology at the University of Virginia , Charlottesville , Virginia 22908 , United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Outer membrane protein G
A
271Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: ompG
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Beta-Barrel Membrane Proteins: Porins and Relatives
Protein: 
OmpG *monomeric* porin
Find proteins for P76045 (Escherichia coli (strain K12))
Go to UniProtKB:  P76045
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 10 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)United StatesR01 GM051329

Revision History 

  • Version 1.0: 2019-06-05
    Type: Initial release
  • Version 1.1: 2019-12-18
    Type: Author supporting evidence