Isoprenoids are lipids formed by the sequential condensation of the five-carbon isoprene unit, isopentenyl diphosphate, and have many diverse functions within the cell. A new pathway that involves the post-translational modification of certain proteins with farnesyl or geranylgeranyl isoprene groups, linked by a thioether bond to a cysteine at or near to the carboxyl terminus, is discussed.
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Joly et al. (1991) studied this question.