Peroxisomal membrane fusion requires two AAA family ATPases, Pex1p and Pex6p

Two AAA family ATPases, NSF and p97, have been implicated in membrane fusio n during assembly and inheritance of organelles of the secretory pathway. W e have now investigated the roles of AAA ATPases in membrane fusion during assembly of the peroxisome, an organelle outside the classical secretory sy stem. Here, we show that peroxisomal membrane fusion in the yeast Yarrowia lipolytica requires two AAA ATPases, Pex1p and Pex6p. Release of membrane-a ssociated Pex1p and Pex6p drives the asymmetric priming of two fusion partn ers. The next step, peroxisome docking, requires release of Pex1p from one part ner. Subsequent fusion of the peroxisomal membranes is independent of both Pex1p and Pex6p.