The conformations of human alpha-thrombin and gamma-thrombin have been compared by circular dichroism, solvent perturbation different spectroscopy, and chemical modification. Circular dichroism studies indicate that proteolytic conversion of alpha-thrombin to gamma-thrombin is accompanied by considerable conformational changes which include a
Heparin binding and protease inhibitor activity of chemically modified antithrombin III.
M N Blackburn et al.
Annals of the New York Academy of Sciences, 370, 700-707 (1981-01-01)
The Journal of biological chemistry, 262(16), 7552-7558 (1987-06-05)
Heparin has been shown to exhibit lower affinity for the antithrombin-thrombin complex than for antithrombin alone (Carlstrom, A.-S., Lieden, K., and Bjork, I. (1977) Thromb. Res. 11, 785-797), suggesting that structural alterations in antithrombin may accompany its reaction with thrombin.
Modification of tryptophanyl residues (Trps) of myosin subfragments 1 (S-1) was performed with dimethyl(2-hydroxy-5-nitrobenzyl)sulfonium bromide (DHNBS). Under controlled conditions, pH 6 at 0 degrees C and 10-min reaction with 10-100-fold molar excess, K+(EDTA) activity was reduced down to less than
The fluorescence intensity difference between rabbit skeletal myosin subfragment 1 (S1) and nucleotide-bound or trapped S1 isolates ATP-sensitive tryptophans (ASTs) emission from the total tryptophan signal. Neutral (acrylamide) quenching of the ASTs is sensitive to the binding or trapping of
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