Linked Life Data

1567192

Source:http://linkedlifedata.com/resource/pubmed/id/1567192

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1992-5-15
pubmed:abstractText
The electron transfer reactions between a lipid bilayer-modified gold electrode and oxidized spinach plastocyanin have been studied by cyclic voltammetry, using either an electrically neutral phosphatidylcholine (PC) bilayer or a positively charged PC bilayer containing 40 mol% dimethyldioctadecylammonium chloride, at two ionic strengths of electrolyte (0.02 and 0.2 M NaClO4). Plastocyanin was found to interact strongly enough with the lipid membrane to support an efficient electron transfer reaction with the electrode. The interaction forces, and therefore the mode of diffusion of plastocyanin molecules to the electrode, which limits the electron transfer rate, could be controlled by the PC concentration. At low lipid concentrations (0-5 mg/ml), electrostatically attractive interactions between specific microelectroactive sites on the surface of the lipid membrane and plastocyanin molecules predominate, producing a radial mode of diffusion of the protein molecules to the electrode surface. On the other hand, at high lipid concentrations (greater than 5 mg/ml), interaction between plastocyanin and the lipid membrane occurs via hydrophobic forces, and a linear diffusion of protein molecules limits the electron transfer process. These observations support and extend other experimental and theoretical results which indicate two possible sites on the surface of the plastocyanin molecule, one hydrophobic and one negatively charged, which are able to participate in electron transfer reactions. We conclude that electrochemical measurements with the present system provide a new approach to the study of redox protein-membrane interactions.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0003-9861
pubmed:author
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
294
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
382-7
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1992
pubmed:articleTitle
Direct electrochemistry of spinach plastocyanin at a lipid bilayer-modified electrode: cyclic voltammetry as a probe of membrane-protein interactions.
pubmed:affiliation
Department of Biochemistry, University of Arizona, Tucson 85721.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S.