Which features allow the KcsA channel to selectively transport K⁺?
(I) The entrance of the channel contains hydrophobic residues which forces the removal of waters of hydration.
(II) It is attracted to the entrance of the channel via electrostatic interactions.
(III) The "selectivity filter" involves a narrowing of the channel,allowing only dehydrated K⁺ access.
(IV) As K⁺is transported through the channel it interacts with −C=O groups from the protein.

Question

Quizplus · Accepted Answer

The KcsA channel selectively transports K+ ions due to electrostatic interactions at the entrance (II), the narrowing of the channel in the selectivity filter that allows only dehydrated K+ ions (III), and interactions with carbonyl groups (IV).

Which Features Allow the KcsA Channel to Selectively Transport K+

Which Features Allow the KcsA Channel to Selectively Transport K⁺