Infrared spectrum of the purple membrane: clue to a proton conduction mechanism?

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Science  23 Apr 1982:
Vol. 216, Issue 4544, pp. 407-408
DOI: 10.1126/science.6280277


The infrared spectrum of the purple membrane of Halobacterium halobium has amide I and amide A frequencies that are anomalously high for standard alpha-helical structures. Normal mode calculations indicate that these and other unusual features of the spectrum can be attributed to alpha 11-helices. Such structures suggest that the helix backbone may provide the framework through which proton transport takes place.