| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2011: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
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| Research Abstract |
In this study ion permeation mechanism of a highly cytotoxicpeptide from a marine sponge, polytheonamide B (pTB), was evaluated by use of planer lipid bilayer. We found that the pTB channel had one-ion pore. This result indicates that the mechanism underlying the ion permeation is different from that of the gramicidin A (gA) channel although both channels have similar β -helical structure. In addition, we revealed that the pTB channel exhibited voltage-dependent gating and fast transition between open and closed state. We suggest that, different from gA channels, the changes in the intra-peptide structure govern the gating of the pTB channel.
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