Heparin induces ThT-positive sCT fibrils and increases the elongation rate at pH 7.4.
A, sCT fibrillation followed by ThT fluorescence. Shown are sCT-OH (blue), sCT-NH2 (red), and sCTH17A-OH (green) without heparin at pH 5.5 (open symbols) and with 1.5:1 hepdisacc:sCT (closed symbols). B, fibrillation of sCT-NH2 and sCT-NH2·heparin (1:1.6 molar ratio) at pH 7.4 followed by CD at 206 nm. The two conditions with/without heparin are each shown as duplicates to show the lag time variability. a.u., arbitrary units; mdeg, millidegrees.