Title : Characterization of the outer pore region of the apamin-sensitive Ca2+-activated K+ channel rSK2.

Pub. Date : 2004 Jun 15

PMID : 15208028






6 Functional Relationships(s)
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1 Interestingly SK2 V342G became CTX sensitive with a Kd of 19 nM and was also KTX sensitive Kd=97 nM. ktx potassium calcium-activated channel subfamily N member 2 Homo sapiens
2 SK2 S344E (KdCTX = 105 nM,KdKTX = 144 nM) and G348D (KdCTX = 31 nM,Kd KTX = 89 nM) became also CTX and KTX sensitive with a lower affinity. ktx potassium calcium-activated channel subfamily N member 2 Homo sapiens
3 Because the exchange of a single residue could create a new high affinity binding site for CTX and KTX we concluded that the outer vestibule around position V342, S344, and G348 of the SK2 K+ channel pore is very similar to those of voltage-gated K+ channels such as the Shaker K+ channel, Kv1.1 and Kv1.3 channels and also to the prokaryotic KcsA channel. ktx potassium calcium-activated channel subfamily N member 2 Homo sapiens
4 Interestingly SK2 V342G became CTX sensitive with a Kd of 19 nM and was also KTX sensitive Kd = 97 nM. ktx potassium calcium-activated channel subfamily N member 2 Homo sapiens
5 SK2 S344E (KdCTX = 105 nM,KdKTX = 144 nM) and G348D (KdCTX = 31 nM,Kd KTX = 89 nM) became also CTX and KTX sensitive with a lower affinity. ktx potassium calcium-activated channel subfamily N member 2 Homo sapiens
6 Because the exchange of a single residue could create a new high affinity binding site for CTX and KTX we concluded that the outer vestibule around position V342, S344, and G348 of the SK2 K+ channel pore is very similar to those of voltage-gated K+ channels such as the Shaker K+ channel, Kv1.1 and Kv1.3 channels and also to the prokaryotic KcsA channel. ktx potassium calcium-activated channel subfamily N member 2 Homo sapiens