Calcium sensitivity of BK-type KCa channels determined by a separable domain

Aguan Wei, Christopher Solaro, Christopher Lingle, Lawrence Salkoff

Research output: Contribution to journalArticlepeer-review

227 Scopus citations


High conductance, Ca2+-activated (BK-type) K+ channels from mouse (mSlo) and Drosophila (dSlo) differ in their functional properties but share a conserved core resembling voltage-gated K+ channels and a tail appended to the core by a nonconserved linker. We have found that the channel subunit is physically divisible into these two conserved domains and that the core determines such properties as channel open time, conductance, and, probably, voltage dependence, whereas the tail determines apparent Ca2+ sensitivity. Both domains are required for function. We demonstrated the different roles of the core and tail by taking advantage of the functional differences between mSlo and dSlo. Heterologous pairing of cores and tails from mSlo and dSlo showed that single-channel properties were always characteristic of the core species, but that apparent Ca2+ sensitivity was adjusted up or down depending on the species of the tail. Thus, the tail is implicated in the Ca2+-sensing role of BK channels.

Original languageEnglish
Pages (from-to)671-681
Number of pages11
Issue number3
StatePublished - Sep 1994


Dive into the research topics of 'Calcium sensitivity of BK-type KCa channels determined by a separable domain'. Together they form a unique fingerprint.

Cite this