更新于:2025-05-07

KCNN2

基本信息

别名
hSK2、KCa2.2、KCNN2
+ [8]
简介
Small conductance calcium-activated potassium channel that mediates the voltage-independent transmembrane transfer of potassium across the cell membrane through a constitutive interaction with calmodulin which binds the intracellular calcium allowing its opening (PubMed:10991935, PubMed:33242881, PubMed:9287325). The current is characterized by a voltage-independent activation, an intracellular calcium concentration increase-dependent activation and a single-channel conductance of about 3 picosiemens (PubMed:10991935). Also presents an inwardly rectifying current, thus reducing its already small outward conductance of potassium ions, which is particularly the case when the membrane potential displays positive values, above + 20 mV (PubMed:10991935). The inward rectification could be due to a blockade of the outward current by intracellular divalent cations such as calcium and magnesium and could also be due to an intrinsic property of the channel pore, independent of intracellular divalent ions. There are three positively charged amino acids in the S6 transmembrane domain, close to the pore, that collectively control the conductance and rectification through an electrostatic mechanism. Additionally, electrostatic contributions from these residues also play an important role in determining the intrinsic open probability of the channel in the absence of calcium, affecting the apparent calcium affinity for activation. Forms an heteromeric complex with calmodulin, which is constitutively associated in a calcium-independent manner. Channel opening is triggered when calcium binds the calmodulin resulting in a rotary movement leading to the formation of the dimeric complex to open the gate (By similarity). Plays a role in the repolarization phase of cardiac action potential (PubMed:13679367).

分析

对领域进行一次全面的分析。
对领域进行一次全面的分析。
Eureka LS:
全新生物医药AI Agent 覆盖科研全链路,让突破性发现快人一步
立即开始免费试用!
智慧芽新药情报库是智慧芽专为生命科学人士构建的基于AI的创新药情报平台,助您全方位提升您的研发与决策效率。
立即开始数据试用!
智慧芽新药库数据也通过智慧芽数据服务平台,以API或者数据包形式对外开放,助您更加充分利用智慧芽新药情报信息。
生物序列数据库
生物药研发创新
免费使用
化学结构数据库
小分子化药研发创新
免费使用