1UUJ, 1VYH504818472ENSG00000007168ENSMUSG00000020745P43034P63005NM_000430NM_013625NP_000421NP_038653Platelet-activating factor acetylhydrolase IB subunit alpha or Lisencephaly protein-1 (LIS-1) is an enzyme that in humans is encoded by the PAFAH1B1 gene.

[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).

In addition, a single-subunit isoform of this enzyme is found in serum.

The gene is 91,953 bases in length and encodes a protein of 410 amino acids (predicted molecular weight 46.638 kilodaltons).