Platelet-activating factor acetylhydrolase IB subunit alpha or Lisencephaly protein-1 (LIS-1) is an enzyme that in humans is encoded by the PAFAH1B1 gene. [5] [6] [7] The protein plays an important role in regulating the motor protein dynein. [8]
PAFAH1B1 was identified as encoding a gene that when mutated or lost caused the lissencephaly associated with Miller–Dieker syndrome. PAFAH1B1 encodes the non-catalytic alpha subunit of the intracellular Ib isoform of platelet-activating factor acetylhydrolase, a heterotrimeric enzyme that specifically catalyzes the removal of the acetyl group at the sn-2 position of platelet-activating factor (identified as 1-O-alkyl-2-acetyl-sn-glyceryl-3-phosphorylcholine). Two other isoforms of intracellular platelet-activating factor acetylhydrolase exist: one composed of multiple subunits, the other, a single subunit. In addition, a single-subunit isoform of this enzyme is found in serum. [7]
According to one study, PAFAH1B1 interacts with VLDL receptor activated by reelin. [9]
The gene is located at chromosome 17p13.3 on the Watson (plus) strand. The gene is 91,953 bases in length and encodes a protein of 410 amino acids (predicted molecular weight 46.638 kilodaltons).
PAFAH1B1 has been shown to interact with DYNC1H1, [10] CLIP1, [11] NDEL1, [12] [13] NDE1, [14] PAFAH1B3, [15] PAFAH1B2, [15] NUDC, [16] TUBA1A [17] and Doublecortin. [18]