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Volumn 271, Issue 5246, 1996, Pages 213-216

Direct physical measure of conformational rearrangement underlying potassium channel gating

Author keywords

[No Author keywords available]

Indexed keywords

POTASSIUM CHANNEL; VOLTAGE GATED CHANNEL FORMING PROTEIN;

EID: 0030059224     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.271.5246.213     Document Type: Article
Times cited : (424)

References (37)
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    • 2, and 10 mM Hepes (pH 7.1)]. Whole-cell gating charge was calculated by subtraction of the linear capacitative component from the integral of the off-gating current. Confocal images were acquired with a Bio-Rad MRC-1000 inverted confocal microscope in photon counting mode with a 20× objective.
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    • note
    • Abbreviations for the amino acid residues are as follows: A, Ala; C, Cys; D, Asp; F, Phe; H, His; I, Ile; K, Lys, L, Leu; M, Met; N, Asn; P, Pro, Q, Gln; R. Arg, S, Ser, T, Thr, V. Val, and W, Trp
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    • note
    • L366C had a half-maximal voltage of activation of -53 8 ± 1.8 mV (mean ± SEM; n = 5), indicating that channels would be mainly activated dunng the TMRM incubation
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    • note
    • Fluorescence was measured with a Hamamatsu HC120-05 photomultiplier tube connected to a Nikon DIAPHOT-TMD inverted microscope with TMD-EF Epi-Ftuorescence Attachment and a Chroma High Q TRITC filter, and it was digitized at 20 kHz and low-pass filtered at 1 kHz with an 8-pole Bessel filter. Each response is an average of 5 to 10 traces
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    • note
    • +-MBSH with 50 mM Kl decreased peak fluorescence of 5 μM TMRM by 40%.
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    • note
    • We thank L Y. Jan, H. Lecar, J. Ngai, E. Reuveni, O. Baker, R. Harris, H. P. Larsson, and K. Zito for valuable discussion; A, Glazer for advice about fluorescence; G. Westheimer for advice on optical filters; and Technical Instruments Corporation for loan of fluorescence microscopy equipment. ShH4 (W434F/ △6-46) was provided by L Toro, and the antibody for the immunoprecipitation was provided by L. Y. Jan. Supported by American Heart Association-California Affiliate grant 94-216, by a McKnight Scholar Award to E.Y I., and by U.S. Department of Energy contract DE-AC03-76SF00098 to M.M M.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.