cysteine residue (Cys, C)

Introduction

Side-chain is -CH2-SH.

Thus Cys contains sulfhydryl (-SH) or thiol group.

Cysteine residues may react via

• oxidation to form
  • disulfides
  • sulfoxides
  • sulfones
  • sulfates
• alkylation
• nitrosylation by nitric oxide

More general terms

• sulfur residue

Additional terms

• cysteine