Subcellular localisation and processing of non-specific lipid transfer protein are not aberrant in Rhizomelic Chondrodysplasia Punctata fibroblasts

The import into peroxisomes and maturation of peroxisomal 3-oxoacyl-CoA thiolase are impaired in patients with the Rhizomelic form of Chondrodysplasia Punctata (RCDP). Here we show by means of immunoblotting and subcellular fractionation that non-specific lipid transfer protein (nsLTP), another peroxisomal protein synthesised as a larger precursor, is localised in peroxisomes and is present as the mature protein in RCDP fibroblasts. Thus the component of the import machinery defective in RCDP is not required for the import of nsLTP into peroxisomes.