2r9r is a 4 chain structure with sequence from Buffalo rat. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
[KCAB2_RAT] Accessory potassium channel protein which modulates the activity of the pore-forming alpha subunit.
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
Voltage-dependent K+ (Kv) channels repolarize the action potential in neurons and muscle. This type of channel is gated directly by membrane voltage through protein domains known as voltage sensors, which are molecular voltmeters that read the membrane voltage and regulate the pore. Here we describe the structure of a chimaeric voltage-dependent K+ channel, which we call the 'paddle-chimaera channel', in which the voltage-sensor paddle has been transferred from Kv2.1 to Kv1.2. Crystallized in complex with lipids, the complete structure at 2.4 angstrom resolution reveals the pore and voltage sensors embedded in a membrane-like arrangement of lipid molecules. The detailed structure, which can be compared directly to a large body of functional data, explains charge stabilization within the membrane and suggests a mechanism for voltage-sensor movements and pore gating.
Atomic structure of a voltage-dependent K+ channel in a lipid membrane-like environment.,Long SB, Tao X, Campbell EB, MacKinnon R Nature. 2007 Nov 15;450(7168):376-82. PMID:18004376[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
↑Long SB, Tao X, Campbell EB, MacKinnon R. Atomic structure of a voltage-dependent K+ channel in a lipid membrane-like environment. Nature. 2007 Nov 15;450(7168):376-82. PMID:18004376 doi:https://dx.doi.org/10.1038/nature06265
