5KOM

The crystal structure of fluoride channel Fluc Ec2 F83I Mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.69 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.218 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Mechanistic signs of double-barreled structure in a fluoride ion channel.

Last, N.B.Kolmakova-Partensky, L.Shane, T.Miller, C.

(2016) Elife 5

  • DOI: 10.7554/eLife.18767
  • Primary Citation of Related Structures:  
    5KBN, 5KOM

  • PubMed Abstract: 
  • The Fluc family of F(-) ion channels protects prokaryotes and lower eukaryotes from the toxicity of environmental F(-). In bacteria, these channels are built as dual-topology dimers whereby the two subunits assemble in antiparallel transmembrane orientat ...

    The Fluc family of F(-) ion channels protects prokaryotes and lower eukaryotes from the toxicity of environmental F(-). In bacteria, these channels are built as dual-topology dimers whereby the two subunits assemble in antiparallel transmembrane orientation. Recent crystal structures suggested that Fluc channels contain two separate ion-conduction pathways, each with two F(-) binding sites, but no functional correlates of this unusual architecture have been reported. Experiments here fill this gap by examining the consequences of mutating two conserved F(-)-coordinating phenylalanine residues. Substitution of each phenylalanine specifically extinguishes its associated F(-) binding site in crystal structures and concomitantly inhibits F(-) permeation. Functional analysis of concatemeric channels, which permit mutagenic manipulation of individual pores, show that each pore can be separately inactivated without blocking F(-) conduction through its symmetry-related twin. The results strongly support dual-pathway architecture of Fluc channels.


    Organizational Affiliation

    Department of Biochemistry, Howard Hughes Medical Institute, Brandeis University, Waltham, United States.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Putative fluoride ion transporter CrcB AB147Escherichia coliMutation(s): 2 
Gene Names: 
crcBAC789_145pl00540AKG99_27195AL505_410006AN206_26275AUQ25_20445ECONIH1_26550ECS286_0026MJ49_27125pCTXM15_EC8_00123pO103_22SK78_04822crcB_2flc_2AKG29_01220B6V57_25995B7C53_24430B9T59_30510BANRA_05655BANRA_05710BEN53_26765BIU72_24510BK292_28205BK296_24930BK334_22235BK373_23795BON66_22385BON69_17555BON71_03125BON72_04410BON76_23080BON86_18360BON94_16600BVL39_28685C2M16_27610C4K41_18470C4M78_26960C5F73_28830C5P01_26640C5P44_26785C6B13_25705C7B08_22045C9160_28010C9201_28610C9E25_24405CDL37_21115CSB64_25975CWS33_26140D1912_23150D2184_26920D2188_23810D4U49_23430D7W70_25855D7Y10_22455D9C99_23085D9D33_24680D9D94_24325D9E19_21410D9F17_25195D9F87_24785D9G11_25285D9H36_25020D9H70_24700D9J44_26040D9J60_25915D9K02_24930D9K48_12550D9K54_12845D9L99_22160DAH18_26070DB359_26980DL545_01300DLU67_24300DLU82_24070DLX38_21660DM272_23155DN808_21420DNI21_22025DNQ45_14105DNX19_24210DOM23_22320DP265_23725DP277_24230DQF72_24030DS966_25260DTL90_25845DWB25_27055E2112_25200E2148_25435EA223_17385EA239_25270EA250_26195EA429_25950EA435_26495EIA08_25210EIZ93_19245EJ366_00165ELT20_22240ELT22_23900ELT58_23370ELX56_24555ELX56_26650ELY05_20840ELY05_25530EPS76_20210EPS94_25350EVY14_24275ExPECSC019_03176ExPECSC038_03841EXX06_27990EXX23_23730EXX55_27910EXX87_27755EYX82_20275EYX99_18565F1E13_25120F1E19_23340F9050_24150FORC82_p488FQU83_00900G3565_28150GP698_23185GQE58_24285GZS12_25160NCTC9001_00147NCTC9077_06349NCTC9434_05106NCTC9969_05488RCS79_P0115SAMEA3472090_04449SAMEA3752620_04806SAMEA3753164_04868SAMEA4370473_00090

Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Fluc Family
Protein: 
Fluc F- ion channel homolog in complex Ec2-S9 monobody F801 mutant
Find proteins for Q6J5N4 (Escherichia coli)
Explore Q6J5N4 
Go to UniProtKB:  Q6J5N4
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
monobody CD97Homo sapiensMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.69 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.218 
  • Space Group: P 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.5α = 90
b = 87.5β = 90
c = 144.54γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
Aimlessdata scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesRO1-GM107023

Revision History 

  • Version 1.0: 2016-08-03
    Type: Initial release
  • Version 1.1: 2016-08-10
    Changes: Database references
  • Version 1.2: 2017-09-27
    Changes: Author supporting evidence, Derived calculations
  • Version 1.3: 2019-12-25
    Changes: Author supporting evidence