Tetranitromethane as a Nitrating Reagent for Tyrosine and Tyrosine-Containing Peptides and Proteins
- 1 February 1971
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Biochemistry
- Vol. 49 (2) , 154-161
- https://doi.org/10.1139/o71-022
Abstract
After nitration of hemoglobin and ribonuclease with tetranitromethane, the sum of tyrosine and nitrotyrosine accounted for 80% or less of the tyrosyl residues known to be present in these proteins. Reasons for this discrepancy were explored by nitrating tyrosine, glycyltyrosine, and glycyltyrosylglycine. Ninhydrin-negative substances containing the carbon atoms of tyrosine were isolated in addition to nitrated tyrosines, which may account for the apparent loss of tyrosine in nitrated proteins.Keywords
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