Abstract:
:The sequence of a novel cGMP-regulated, tetrameric, K(+) selective channel (Sp-tetraKCNG) was discovered in the sea urchin Strongylocentrotus purpuratus. The Sp-tetraKCNG is a single polypeptide made of four KCNG domains similar to voltage-dependent Na(+) and Ca(2+) channels. Each KCNG domain has six transmembrane segments (S1-S6), the ion pore having the K(+) selectivity signature GYGD and a cyclic nucleotide-binding domain (CNBD). This novel channel is evolutionary located between K(+)-selective and voltage-dependent EAG channels and voltage-independent cationic CNG channels. Bilayer reconstitutions demonstrate such a cGMP-regulated K(+) selective channel in sea urchin spermatozoa.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Galindo BE,de la Vega-Beltrán JL,Labarca P,Vacquier VD,Darszon Adoi
10.1016/j.bbrc.2007.01.035subject
Has Abstractpub_date
2007-03-16 00:00:00pages
668-75issue
3eissn
0006-291Xissn
1090-2104pii
S0006-291X(07)00035-6journal_volume
354pub_type
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