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1hxt

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[[Image:1hxt.gif|left|200px]]
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{{Seed}}
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[[Image:1hxt.png|left|200px]]
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{{STRUCTURE_1hxt| PDB=1hxt | SCENE= }}
{{STRUCTURE_1hxt| PDB=1hxt | SCENE= }}
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'''OMPF PORIN MUTANT NQAAA'''
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===OMPF PORIN MUTANT NQAAA===
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==Overview==
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The channel constriction of OmpF porin, a pore protein in the bacterial outer membrane, is highly charged due to the presence of three arginines (R42, R82, and R132) and two acidic residues (D113 and E117). The influence of these charges on ion conductance, ion selectivity, and voltage gating has been studied with mutants D113N/E117Q, R42A/R82A/R132A/D113N/E117Q, and V18K/G131K, which were designed to remove or add protein charge at the channel constriction. The crystal structures revealed no or only local changes compared to wild-type OmpF, thus allowing a comparative study. The single-channel conductance of the isosteric D113N/E117Q variant was found to be 2-fold reduced, and that of the pentuple mutant was 70% of the wild-type value, despite a considerably larger pore cross section. Ion selectivity was drastically altered by the mutations with cation/anion permeability ratios ranging from 1 to 12. Ion flow through these and eight other mutants, which have been characterized previously, was simulated by Brownian dynamics based on the detailed crystal structures. The calculated ion selectivity and relative channel conductance values agree well with the experimental data. This demonstrates that ion translocation through porin is mainly governed by pore geometry and charge, the two factors that are properly represented in the simulations.
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The line below this paragraph, {{ABSTRACT_PUBMED_11371193}}, adds the Publication Abstract to the page
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(as it appears on PubMed at http://www.pubmed.gov), where 11371193 is the PubMed ID number.
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{{ABSTRACT_PUBMED_11371193}}
==About this Structure==
==About this Structure==
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[[Category: Membrane protein]]
[[Category: Membrane protein]]
[[Category: Porin]]
[[Category: Porin]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 19:20:27 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 10:05:53 2008''

Revision as of 07:05, 1 July 2008

Image:1hxt.png

Template:STRUCTURE 1hxt

OMPF PORIN MUTANT NQAAA

Template:ABSTRACT PUBMED 11371193

About this Structure

1HXT is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Role of charged residues at the OmpF porin channel constriction probed by mutagenesis and simulation., Phale PS, Philippsen A, Widmer C, Phale VP, Rosenbusch JP, Schirmer T, Biochemistry. 2001 May 29;40(21):6319-25. PMID:11371193

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