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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Electrophoretic mobility of a monotopic membrane protein inserted into the top of supported lipid bilayers.
European Physical Journal. E, Soft Matter 2016 December
We have studied the translational migration of a monotopic membrane protein, the bacterial sulfide quinone reductase (SQR) in supported n-bilayers ([Formula: see text]) under the influence of an electric field parallel to the membrane plane. The direction of the migration changes when the charge of the protein changes its sign. Measuring mobilities at different pH enables us to gain experimental physico-chemical data on SQR as its isoelectric point and its estimated oligomeric state (at least trimeric) when inserted in a lipid membrane. Consequently, in addition to the migration study of membrane proteins in a lipid environment, this experimental system, previously used with a transmembrane protein, is thus suitable to define membrane protein properties in conditions approaching the native ones (in the absence of detergent).
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