The amino acid cysteine has a sulfhydryl (-SH) group that can participate in the formation of a(n) bond, linking the sulfur atoms of two cysteine molecules.
Question
The amino acid cysteine has a sulfhydryl (-SH) group that can participate in the formation of a(n) bond, linking the sulfur atoms of two cysteine molecules.
Solution
The amino acid cysteine can participate in the formation of a disulfide bond. This occurs when the sulfur atoms of two cysteine molecules link together. Here are the steps:
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Two cysteine molecules come into proximity. Each cysteine molecule has a sulfhydryl (-SH) group.
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An oxidation reaction occurs, which involves the removal of hydrogen atoms. This reaction is facilitated by an enzyme.
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The sulfur atom of one cysteine molecule forms a covalent bond with the sulfur atom of the other cysteine molecule. This is a disulfide bond.
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The result is a cystine molecule, which is essentially two cysteine molecules linked by a disulfide bond.
This disulfide bond is crucial in the formation and stabilization of the tertiary structure of proteins.
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