title: Anomalous amide I infrared absorption of purple membrane.
abstract: Infrared absorption of purple membrane reveals an amide I frequency that falls outside the range normally found for alpha helices. This may indicate along with x-ray diffraction the existence of bacteriorhodopsin alpha helices with unusual structure.
mesh_terms: D000577:Amides; D001436:Bacteriorhodopsins; D002338:Carotenoids; D003903:Deuterium; D006217:Halobacterium / Q000648:ultrastructure; D008565:Membrane Proteins; D011487:Protein Conformation; D013055:Spectrophotometry, Infrared
chemical_list: D000577:Amides; D008565:Membrane Proteins; D002338:Carotenoids; D001436:Bacteriorhodopsins; D003903:Deuterium