Modulation of the skeletal muscle sodium channel α-subunit by the β1 -subunit》.pdfVIP

Modulation of the skeletal muscle sodium channel α-subunit by the β1 -subunit》.pdf

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Modulation of the skeletal muscle sodium channel α-subunit by the β1 -subunit》.pdf

Volume 336, number 3, 535-539 FEBS 13476 December 1993 0 1993 Federation of European Biochemical Societies 93/$6.00 Modulation of the skeletal muscle sodium channel a-subunit by the /I1-subunit Martin Wallnep*, Lukas Weigl”, Pratap Meeraa, Ilana Lotanb ‘Institutfir Medizinische Physik und Biophysik, Universitaet Graz, Graz, Austria bDepartment of Physiology and Pharmacology, Sackler Medical School, University of Tel Aviv, Tel Aviv, Israel Received 3 November 1993 Co-expression of cloned sodium channel p,-subunit with the rat skeletal muscle-subunit (Q) accelerated the macroscopic current decay, enhanced the current amplitude, shifted the steady state inactivation curve to more negative potentials and decreased the time required for complete recovery from inactivation. Sodium channels expressed from skeletal muscle mRNA showed a similar behaviour to that observed from cc,, indicating that B, restores ‘physiological’ behaviour. Northern blot analysis revealed that the Na+ channel /$-subunit is present in high abundance (about 0.1%) in rat heart, brain and skeletal muscle, and the hybridization with untranslated region of the ‘brain’ B, cDNA to skeletal muscle and heart mRNA indicated that the diffferent Na’ channel a-subunits in brain, skeletal muscle and heart may share a common /J-subunit. Sodium

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