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Composite model of the KV channel.

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(1)

1920 Na+

107K+ /sec

0.4 nm

β

NMR structure of gramicidin A embedded in a

dimyristoyl phosphatidylcholine bilayer.

N O C

Figure 10-3

β

X-Ray structure of the KcsA K+ channel from Streptomyces lividans.

Science v. 280, p. 69 (1998)

(2)

The Vision of the Pore 1998 Science

Portions of the KcsA K+ channel responsible for its ion selectivity viewed similarly

A schematic diagram of the KcsA K+ channel

Predicted secondary structure and membrane orientation of voltage-gated K+ channels.

Kv

Composite model of the KV channel.

Figure 10-8

KV channel .

(3)

Figure 10-9b,c

Arg

KV channel .

2013 1

Figure 10-11a

Figure 10-12

Thermodiynamic Principles

(4)

H = U + PV ΔH = ΔU +PΔV, ΔU = ΔQ - ΔW

ΔH = ΔQ - ΔW +PΔV = ΔQ - ΔW’

dS = dQ/T (

U P V Q W

ΔHvap=40.7 kJmol-1

T=373 °K ΔSvap= 109.1 JK -1

G = H - TS ΔG = ΔH - TΔS

1N = 1 Kg m s-2 [N m] = [J]

0.24 cal = 1J = 1 Kg m2s-2 1/2 mv2 = 1/2 (2 kg) (1 m s-1)2 = 1 Kg m2s-2 = 1Nm

2 kg 1 m s-1 1J

図

Figure 10-9b,c Arg KV channel . 2013 1 Figure 10-11a Figure 10-12 Thermodiynamic Principles

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