Tertiapin Inhibitor for inward-rectifier K+ channels
[Novel high-affinity inhibitor for inward-rectifier K+ channels]
Inward-rectifier K+ channels accomplish many important and diversified biological roles. Thus far, there are no high-affinity inhibitors that directly target any inward-rectifier K+ channels.
Only Lq2, scorpion toxin, blocks the ROMK1 inward-rectifier K+ channel, but the affinity is rather low (Kd = 0.4 mM) [Biochemistry, 36, 6936 (1997)].
Recently, a novel high-affinity inhibitor, Tertiapin has reported [Biochemistry, 37, 13291 (1998)]. This peptide blocks a G protein-gated channel (GIRK1/4) and the ROMK1 channel with nanomolar affinity.
About selectivity, tertiapin is insensitive to IRK1-channel, a closely related channel to GIRK1/4 and the ROMK1. Tertiapin will be a very useful tool for studying the physiological and the structure-function relationship of these channels.
|4364-s||Tertiapin||0.1 mg vial||15,000|