Protein prenyltransferase alpha subunit repeat containing 1 (PTAR1)

PTAR1 is the alpha subunit of a newly characterized protein prenyltransferase, GGTase-III, which partners with the RabGGTB beta subunit to transfer geranylgeranyl groups specifically to substrates such as FBXL2 and Ykt6[2][4]. This modification is vital for anchoring these target proteins to cellular membranes, controlling their localization and turnover. PTAR1-mediated geranylgeranylation of FBXL2 influences membrane protein polyubiquitylation, while modification of Ykt6 is essential for Golgi membrane integration and SNARE complex formation, contributing to vesicular trafficking and maintenance of organellar structure[2]. PTAR1 resides primarily in the mitochondria but is also implicated in broader organelle functions[3]. Although no drugs currently target PTAR1 directly, the enzyme’s activity is linked to disease mechanisms including cancer and membrane homeostasis.

Other names

PTAR1Protein prenyltransferase alpha subunit repeat-containing protein 1Protein prenyltransferase alpha subunit repeat containing 1

Drugs interacting with prenyltransferases typically act by inhibiting prenyl group transfer, disrupting membrane localization and downstream signaling of target substrates[1][2]. For GGTase inhibitors, the mechanism is blockade of geranylgeranylation.