Abstract
Mutation of all nonessential cysteine residues to serines in rhodanese turns the enzyme into a form (C3S) that is fully active but less stable than wild type (WT). bis-ANS binding studies have shown that C3S has more hydrophobic exposure than WT, although both have similar secondary structures suggesting the flexibility of its structure. Activity of C3S falls once it binds bis-ANS, and covalent binding of bis-ANS to C3S is induced by light. bis-ANS binds to C3S in its C-terminal domain as is shown by gel electophoresis and proteolysis. bis-ANS binding makes the C-terminal domain more susceptible to trypsin cleavage.
Published Version
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