Abstract:
:Until now, voltage-gated Ca(2+) channel proteins have been found only in eukaryotes. Here we report that a gene recently discovered in the eubacterium Bacillus halodurans codes for a protein closely related to eukaryotic Ca(2+) channels, but that has only one 6-transmembrane-segement (6TM) motif, instead of four, in its pore-forming subunit. This is supported by the comparison of consensus sequences, which, along with the patterns of residue conservation, indicates a similar structure in the membrane to voltage-gated K(+) channels. From this we hypothesize that Ca(2+) channels originally evolved in bacteria, and that the specific eubacteria protein highlighted here is an ideal candidate for structure determination efforts.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Durell SR,Guy HRdoi
10.1006/bbrc.2001.4408subject
Has Abstractpub_date
2001-03-02 00:00:00pages
741-6issue
3eissn
0006-291Xissn
1090-2104pii
S0006-291X(01)94408-0journal_volume
281pub_type
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更新日期:2002-04-05 00:00:00