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Keyword - CTQ (KW-0885)

Definition

Protein which contains at least one cysteine tryptophylquinone (CTQ) cross-link modification. CTQ is formed by oxidation of the indole ring of a tryptophan to form tryptophylquinone followed by covalent cross-linking with a cysteine residue. In the quinohemoprotein amine dehydrogenase, CTQ mediates during the catalytic cycle electron transfer from the substrate to either a copper protein, azurin, or cytochrome c-550.

Synonyms

  • Cysteine tryptophylquinone

Category

PTM

Graphical

CTQPTM
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