Document Detail


Entropy-enthalpy compensation at the single protein level: pH sensing in the bacterial channel OmpF.
MedLine Citation:
PMID:  25375963     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The pH sensing mechanism of the OmpF channel operates via ligand modification: increasing acidity induces the replacement of cations with protons in critical binding sites decreasing the channel conductance. Aside from the change in enthalpy associated with the binding, there is also a change in the microscopic arrangements of ligands, receptors and the surrounding solvent. We show that the pH-modulation of the single channel conduction involves small free energy changes because large enthalpic and entropic contributions change in opposite ways, demonstrating an approximate enthalpy-entropy compensation for different salts and concentrations.
Authors:
Antonio Alcaraz; María Queralt-Martín; Carmina Verdiá-Báguena; Vicente M Aguilella; Salvador Mafé
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-11-6
Journal Detail:
Title:  Nanoscale     Volume:  -     ISSN:  2040-3372     ISO Abbreviation:  Nanoscale     Publication Date:  2014 Nov 
Date Detail:
Created Date:  2014-11-6     Completed Date:  -     Revised Date:  2014-11-7    
Medline Journal Info:
Nlm Unique ID:  101525249     Medline TA:  Nanoscale     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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