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. 1996 Jun 17;15(12):2914–2923.

The peroxisome biogenesis disorder group 4 gene, PXAAA1, encodes a cytoplasmic ATPase required for stability of the PTS1 receptor.

T Yahraus 1, N Braverman 1, G Dodt 1, J E Kalish 1, J C Morrell 1, H W Moser 1, D Valle 1, S J Gould 1
PMCID: PMC450231  PMID: 8670792

Abstract

In humans, defects in peroxisome assembly result in the peroxisome biogenesis disorders (PBDs), a group of genetically heterogeneous, lethal recessive diseases. We have identified the human gene PXAAA1 based upon its similarity to PpPAS5, a gene required for peroxisome assembly in the yeast Pichia pastoris. Expression of PXAAA1 restored peroxisomal protein import in fibroblasts from 16 unrelated members of complementation group 4 (CG4) of the PBD. Consistent with this observation, CG4 patients carry mutations in PXAAA1. The product of this gene, Pxaaa1p, belongs to the AAA family of ATPases and appears to be a predominantly cytoplasmic protein. Substitution of an arginine for the conserved lysine residue in the ATPase domain of Pxaaa1p abolished its biological activity, suggesting that Pxaaa1p is an ATPase. Furthermore, Pxaaa1p is required for stability of the predominantly cytoplasmic PTS1 receptor, Pxr1p. We conclude that Pxaaa1p plays a direct role in peroxisomal protein import and is required for PTS1 receptor activity.

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