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Science 9 March 1990:
Vol. 247. no. 4947, pp. 1233 - 1236
DOI: 10.1126/science.1690454
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Articles

Science, Vol 247, Issue 4947, 1233-1236
Copyright © 1990 by American Association for the Advancement of Science

articles

Selectivity changes in site-directed mutants of the VDAC ion channel: structural implications

E Blachly-Dyson, S Peng, M Colombini, and M Forte

Vollum Institute for Advanced Biomedical Research, Oregon Health Sciences University, Portland 97201.

The gene encoding the yeast mitochondrial outer membrane channel VDAC was subjected to site-directed mutagenesis to change amino acids at 29 positions to residues differing in charge from the wild-type sequence. The mutant genes were then expressed in yeast, and the physiological consequences of single and multiple amino acid changes were assessed after isolation and insertion of mutant channels into phospholipid bilayers. Selectivity changes were observed at 14 sites distributed throughout the length of the molecule. These sites are likely to define the position of the protein walls lining the aqueous pore and hence, the transmembrane segments. These results have been used to develop a model of the open state of the channel in which each polypeptide contributes 12 beta strands and one alpha helix to form the aqueous transmembrane pathway.


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