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Unformatted text preview: up by amino acids with a negative charge that attract K + to the entry way. Because two K + ions inside the selectivity filter repel each other, this helps overcome the interaction of the K + ions with the oxygen molecules in the channel and allows the K + ions to travel down the channel. Oxygen plays the roles as a stabilizer of the K + ion when it loses its water molecules and enters the selectivity filter. Around the channel water molecules surround the K + , keeping them stable. The sodium ion however, which is smaller than the potassium ion, cannot pass through the channel. In order to prevent sodium from entering, the spatial restrictions prevent the ions to fit between the oxygen atoms in the filter and therefore remain in the water solution. The ability of the channel to strip the BioBM 334 Friday Section potassium ion of its water and allow it to pass at no cost in energy is a kind of selective catalyzed ion transport....
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This note was uploaded on 08/03/2010 for the course BIOBM 3340 taught by Professor Blakenship,j. during the Spring '10 term at Cornell University (Engineering School).
- Spring '10