1a68
From Proteopedia
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'''CRYSTAL STRUCTURE OF THE TETRAMERIZATION DOMAIN OF THE SHAKER POTASSIUM CHANNEL''' | '''CRYSTAL STRUCTURE OF THE TETRAMERIZATION DOMAIN OF THE SHAKER POTASSIUM CHANNEL''' | ||
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[[Category: Pfaffinger, P J.]] | [[Category: Pfaffinger, P J.]] | ||
[[Category: Stevens, C F.]] | [[Category: Stevens, C F.]] | ||
| - | [[Category: | + | [[Category: Aplysia kv1 1]] |
| - | [[Category: | + | [[Category: Potassium channel]] |
| - | [[Category: | + | [[Category: Tetramerization domain]] |
| - | [[Category: | + | [[Category: X-ray structure]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 09:52:26 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 06:52, 2 May 2008
CRYSTAL STRUCTURE OF THE TETRAMERIZATION DOMAIN OF THE SHAKER POTASSIUM CHANNEL
Overview
Voltage-dependent, ion-selective channels such as Na+, Ca2+ and K+ channel proteins function as tetrameric assemblies of identical or similar subunits. The clustering of four subunits is thought to create an aqueous pore centred at the four-fold symmetry axis. The highly conserved, amino-terminal cytoplasmic domain (approximately 130 amino acids) immediately preceding the first putative transmembrane helix S1 is designated T1. It is known to confer specificity for tetramer formation, so the heteromeric assembly of K+-channel subunits is an important mechanism for the observed channel diversity. We have determined the crystal structure of the T1 domain of a Shaker potassium channel at 1.55 A resolution. The structure reveals that four identical subunits are arranged in a four-fold symmetry surrounding a centrally located pore about 20 A in length. Subfamily-specific assembly is provided primarily by polar interactions encoded in a conserved set of amino acids at its tetramerization interface. Most highly conserved amino acids in the T1 domain of all known potassium channels are found in the core of the protein, indicating a common structural framework for the tetramer assembly.
About this Structure
1A68 is a Single protein structure of sequence from Aplysia californica. Full crystallographic information is available from OCA.
Reference
Crystal structure of the tetramerization domain of the Shaker potassium channel., Kreusch A, Pfaffinger PJ, Stevens CF, Choe S, Nature. 1998 Apr 30;392(6679):945-8. PMID:9582078 Page seeded by OCA on Fri May 2 09:52:26 2008
