Reports

High-Resolution Nuclear Magnetic Resonance Spectra of Selectively Deuterated Staphylococcal Nuclease

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Science  20 Sep 1968:
Vol. 161, Issue 3847, pp. 1249-1251
DOI: 10.1126/science.161.3847.1249

Abstract

An analog of staphylococcal nuclease has been prepared in which all amino acids, except the six following, are fully deuterated: tryptophan; methionine; tyrosine, in ring positions 2 and 6; histidine, in ring position 2; aspartic acid and asparagine, β-methylene; and glutamic acid and glutamine, γ-methylene. The analog has a much simpler high-resolution nuclear magnetic resonance spectrum than the fully protonated enzyme. The effects of calcium ion and of the inhibitor 3', 5'-thymidine diphosphate on the spectrum of the analog were readily detected.