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- W1987483403 abstract "A method for determining the orientation of individual bonds within complex macromolecules from polarized IR measurements on oriented single crystals is described. At present, X-ray diffraction is the principal technique used to define the global structure and orientation of macromolecules in the crystalline state. However, resolution limitations and conformational disorder limit the accuracy of the resulting structural model. A quantitative understanding of protein function often requires a more precise description of structural features at a localized active site. Polarized IR measurements of internal stretching bands of N − 3 , CN − , OCN − , and SCN − bound at the ferric heme iron of single crystals of myoglobin are presented. A synthesis of such measurements on different crystal forms leads to an N − 3 orientation consistent with IR measurements on both P2 1 and P2 1 2 1 2 1 crystals, but significantly different from the orientation reported in X-ray crystal structures. Subtle structural changes between these two crystal forms of the CN − complex may account for small differences in the stretching frequency and orientation of the C–N bond." @default.
- W1987483403 created "2016-06-24" @default.
- W1987483403 creator A5037246628 @default.
- W1987483403 date "1997-04-01" @default.
- W1987483403 modified "2023-10-17" @default.
- W1987483403 title "Infrared Crystallography: Structural Refinement through Spectroscopy" @default.
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- W1987483403 doi "https://doi.org/10.1366/0003702971940611" @default.
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