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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Direct observation of substrate distortion by triosephosphate isomerase using Fourier transform infrared spectroscopy.

The infrared spectrum of dihydroxyacetone phosphate bound to triosephosphate isomerase has been measured. There are two carbonyl bands corresponding to the bound substrate, with an intensity ratio of about 3:1. Relative to the carbonyl absorption of dihydroxyacetone phosphate in free solution, the major band is shifted by 19 cm-1 to 1713 cm-1, providing direct evidence of enzyme-induced distortion of the substrate. This strain is probably attributable to an enzymic electrophile that polarizes the carbonyl group of the substrate and thereby promotes catalysis.[1]

References

  1. Direct observation of substrate distortion by triosephosphate isomerase using Fourier transform infrared spectroscopy. Belasco, J.G., Knowles, J.R. Biochemistry (1980) [Pubmed]
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