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abbr. for Cys–aliphatic–aliphatic–X; a C‐terminal tetrapeptide motif that is present in proteins that become prenylated. Following prenylation, the AAX is removed by a CAAX‐prenyl endopeptidase (a metal‐dependent integral membrane protein) and the new C‐terminal cysteine is carboxymethylated.


Subjects: Chemistry.

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