Geranylgeranyl transferase type-1 subunit beta (PGGT1B)

Catalyzes the transfer of a geranyl-geranyl moiety from geranyl-geranyl pyrophosphate to a cysteine at the fourth position from the C-terminus of proteins using the C-terminal sequence Cys-aliphatic-aliphatic-X. Known substrates comprise RAC1, RAC2, RAP1A and RAP1B.

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