Protein Prenyltransferase 

Protein Prenyltransferase is responsible for protein prenylation, a modification that regulates protein function by covalently attaching isoprenyl chains (such as farnesyl or geranyl) to target proteins. Protein Prenyltransferase increases the hydrophobicity and regulates the membrane localization. Protein Prenyltransferase promotes protein-protein interactions and affects cell signal transduction. Protein Prenyltransferase regulates plant growth and development, enhances the stress resistance of plants in response to environmental stresses such as drought and high temperature. Protein Prenyltransferase can be sorted into three main types, protein farnesyltransferase (PFT), protein geranylgeranyltransferase I (PGGT I) and rab geranylgeranyltransferase (PGGT II). PFT is responsible for covalently binding farnesyl to the CaaX sequence of the target protein (C represents cysteine, a is a hydrophobic amino acid, and X is the terminal amino acid). PGGT I modifies the same sequences as PFT, excrpt that X is leucine. PGGT II modifies the Rab protein family with the presence of Rab escort protein (REP). Protein Prenyltransferase dysfunction could lead to the prenylation of oncogenes Ras and Rho, exhibiting oncogenic activity. Protein Prenyltransferase dysfunction causes the prenylation of osteoclasts, resulting in osteoporosis^[1][2].

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