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Potassium channels are a group of ubiquitously expressed proteins that serve numerous functions in excitable and non-excitable cells. One class of integral membrane potassium channels is the large conductance, calcium-activated potassium channel (Maxi K+). Maxi K+ differs from most other potassium channels in that its activation is controlled by both increases in intracellular calcium and by membrane depolarization. Maxi K+ dual activation is possible because of its structure. The core of the channel, which is similar to other potassium channels, is a Maxi K+ alpha homotetramer that contains both a voltage sensor and an intracellular calcium binding domain. In vascular smooth muscle, an auxiliary beta-subunit is found in a 1:1 stoichiometry. The beta-subunit exhibits its effect on the Maxi K+ channel by effectively decreasing by 5- to 10- fold the concentration of calcium required to keep the pore open.
仅用于科研。不用于诊断过程。未经明确授权不得转售。
蛋白别名: Menin; multiple endocrine neoplasia 1; multiple endocrine neoplasia I
基因别名: MEAI; MEN1; menin; SCG2
UniProt ID: (Human) O00255, (Rat) Q9WVR8
Entrez Gene ID: (Human) 4221, (Rat) 29417