| 8742324 |
Lech JJ, Lewis SK, Friedman MA, Johnson LA, Mende-Mueller LM: Binding of acrylonitrile to parvalbumin. . Fundam Appl Toxicol. 1996 Feb;29(2):260-6.
A previous study has shown that acrylonitrile (ACN) has a long half-life in rainbow trout muscle and that [14C] ACN appears to be bound to a 10,000-Da protein in muscle. The labeled protein was purified from muscle of trout exposed to [14C] ACN, separated on 20% SDS-PAGE, and digested for amino acid analysis and sequence analysis. These studies indicated that the labeled protein was the Ca (2+)-binding protein parvalbumin. Parvalbumin is an important calcium-binding protein thought to be involved in the regulation of calcium levels in various parts of the body ranging from neurons to fast-twitch muscle contractions. To study the reaction between parvalbumin and [14C] ACN, frog parvalbumin was incubated with [14C] ACN in vitro under various conditions. These studies indicated that the maximum labeling occurred at 1 nmol/nmol parvalbumin and at pH 7. Amino acid analysis of the labeled protein indicated that the labeled amino acid was probably histidine, and endoproteinase Glu-C (V-8) digestion studies revealed that the 14C was in the 1-81 amino acid segment of the protein, an area that contains two histidines. |
85(1,1,1,5) |