Bacterial potassium channel (e.g., KcsA)

Bacterial potassium channels (e.g., KcsA) are prototypical ion channels found in the cell membranes of bacteria, forming hydrophilic pores that selectively allow potassium ions (K⁺) to move down their electrochemical gradient[1][3][4]. These channels are typically tetramers, composed of four subunits that create a selective pore with a filter region lined by specific amino acids enabling K⁺ selectivity[4][6]. Ion channel formation in bacteria plays crucial roles in maintaining membrane potential, osmoregulation, and adaptation to environmental changes. The structure of these channels, first elucidated for the KcsA channel from *Streptomyces lividans*, has served as the archetype for understanding ion selectivity and conductance[4][6]. This structural insight underpins both physiological bacterial functions and antibacterial strategies based on channel disruption or inhibition.

Other names

bacterial ion channelbacterial K+ channelKcsApotassium channel (bacteria)prokaryotic potassium channel

Channel blocking (e.g., by toxins binding to the pore) Modulation of channel gating or selectivity