Beschreibung:
<jats:p>Which cysteine of apostellacyanine reacts with 4‐vinylpyridine in 6 M guanidine—HCl depends upon the pH. We infer that a disulfide switch occurs at higher pH and that in the native protein the disulfide bridge occurs between Cys‐59 and Cys‐93. Thus Cys‐87, which is homologous to the cysteine ligands of azurin and plastocyanin, is available to bind copper.</jats:p>