Proline-rich membrane anchor 1 (PRiMA)

Proline-rich membrane anchor 1 (PRiMA/PRIMA1) is a membrane protein responsible for the organization and anchoring of acetylcholinesterase (AChE) into tetramers and for targeting AChE to neural cell membranes, including synapses and neuromuscular junctions[1][2][4][8]. The protein contains a proline-rich anchor domain (PRAD) that interacts with AChE's C-terminal peptide, securing the enzyme to the plasma membrane of neurons and muscle cells[1][4][6][8]. Two alternative splice variants exist (PRiMA I and II), with differential roles in neuronal raft localization[6]. PRiMA does not have receptor, enzyme, transporter, or conventional pharmacological target activity, but it is critical for the membrane localization and regulation of synaptic AChE, thus indirectly influencing cholinergic neurotransmission and processes relevant to neurodegenerative disease[1][4][6][8]. Deficiency or alteration in PRiMA function affects surface expression of AChE, with potential consequences in neurological conditions such as Alzheimer’s disease[1][8].

Other names

PRIMA1PRiMAproline-rich membrane anchor 1membrane anchor of acetylcholinesteraseacetylcholinesterase membrane anchor precursor PRiMAproline-rich membrane anchor 1 acetylcholinesterase membrane anchor precursor PRiMA

Not directly targeted by drugs; therapeutics influencing AChE activity may affect downstream pathways (PRiMA anchors AChE but is not itself a drug target)