The Yarrowia lipolytica Gene PAY2 Encodes a 42-kDa Peroxisomal Integral Membrane Protein Essential for Matrix Protein Import and Peroxisome Enlargement but Not for Peroxisome Membrane Proliferation

PAY genes are required for peroxisome assembly in the yeast Yarrowia lipolytica. Here we show that a mutant strain, pay2, is disrupted for the import of proteins targeted by either peroxisomal targeting signal-1 or -2. Electron microscopy of pay2 cells revealed the presence of small peroxisomal "ghosts," similar to the vesicular structures found in fibroblasts of patients with the human peroxisome…