1mpf: Difference between revisions

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[[Image:1mpf.gif|left|200px]]


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==STRUCTURAL AND FUNCTIONAL ALTERATIONS OF A COLICIN RESISTANT MUTANT OF OMPF-PORIN FROM ESCHERICHIA COLI==
The line below this paragraph, containing "STRUCTURE_1mpf", creates the "Structure Box" on the page.
<StructureSection load='1mpf' size='340' side='right'caption='[[1mpf]], [[Resolution|resolution]] 3.00&Aring;' scene=''>
You may change the PDB parameter (which sets the PDB file loaded into the applet)  
== Structural highlights ==
or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
<table><tr><td colspan='2'>[[1mpf]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MPF OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1MPF FirstGlance]. <br>
or leave the SCENE parameter empty for the default display.
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=C8E:(HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE'>C8E</scene></td></tr>
{{STRUCTURE_1mpf| PDB=1mpf |  SCENE= }}
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1mpf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1mpf OCA], [https://pdbe.org/1mpf PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1mpf RCSB], [https://www.ebi.ac.uk/pdbsum/1mpf PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1mpf ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/OMPF_ECOLI OMPF_ECOLI] Forms pores that allow passive diffusion of small molecules across the outer membrane. It is also a receptor for the bacteriophage T2.<ref>PMID:19721064</ref>
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/mp/1mpf_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1mpf ConSurf].
<div style="clear:both"></div>


'''STRUCTURAL AND FUNCTIONAL ALTERATIONS OF A COLICIN RESISTANT MUTANT OF OMPF-PORIN FROM ESCHERICHIA COLI'''
==See Also==
 
*[[Porin 3D structures|Porin 3D structures]]
 
== References ==
==Overview==
<references/>
A strain of Escherichia coli, selected on the basis of its resistance to colicin N, reveals distinct structural and functional alterations in unspecific OmpF porin. A single mutation [Gly-119--&gt;Asp (G119D)] was identified in the internal loop L3 that contributes critically to the formation of the construction inside the lumen of the pore. X-ray structure analysis to a resolution of 3.0 A reveals a locally altered peptide backbone, with the side chain of residue Asp-119 protruding into the channel, causing the area of the constriction (7 x 11 A in the wild type) to be subdivided into two intercommunicating subcompartments of 3-4 A in diameter. The functional consequences of this structural modification consist of a reduction of the channel conductance by about one-third, of altered ion selectivity and voltage gating, and of a decrease of permeation rates of various sugars by factors of 2-12. The structural modification of the mutant protein affects neither the beta-barrel structure nor those regions of the molecule that are exposed at the cell surface. Considering the colicin resistance of the mutant, it is inferred that in vivo, colicin N traverses the outer membrane through the porin channel or that the dynamics of the exposed loops are affected in the mutant such that these may impede the binding of the toxin.
__TOC__
 
</StructureSection>
==About this Structure==
1MPF is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1MPF OCA].
 
==Reference==
Structural and functional alterations of a colicin-resistant mutant of OmpF porin from Escherichia coli., Jeanteur D, Schirmer T, Fourel D, Simonet V, Rummel G, Widmer C, Rosenbusch JP, Pattus F, Pages JM, Proc Natl Acad Sci U S A. 1994 Oct 25;91(22):10675-9. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/7524100 7524100]
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Schirmer, T.]]
[[Category: Schirmer T]]
[[Category: Membrane protein]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 01:33:33 2008''

Latest revision as of 10:46, 14 February 2024

STRUCTURAL AND FUNCTIONAL ALTERATIONS OF A COLICIN RESISTANT MUTANT OF OMPF-PORIN FROM ESCHERICHIA COLISTRUCTURAL AND FUNCTIONAL ALTERATIONS OF A COLICIN RESISTANT MUTANT OF OMPF-PORIN FROM ESCHERICHIA COLI

Structural highlights

1mpf is a 1 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 3Å
Ligands:
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

OMPF_ECOLI Forms pores that allow passive diffusion of small molecules across the outer membrane. It is also a receptor for the bacteriophage T2.[1]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

See Also

References

  1. ↑ Duval V, Nicoloff H, Levy SB. Combined inactivation of lon and ycgE decreases multidrug susceptibility by reducing the amount of OmpF porin in Escherichia coli. Antimicrob Agents Chemother. 2009 Nov;53(11):4944-8. doi: 10.1128/AAC.00787-09., Epub 2009 Aug 31. PMID:19721064 doi:10.1128/AAC.00787-09

1mpf, resolution 3.00Å

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