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lüll Peroxisome biogenesis and peroxisome biogenesis disorders Fujiki YFEBS Lett 2000[Jun]; 476 (1-2): 42-6Peroxisome assembly in mammals requires more than 15 genes. Two isoforms of the peroxisome targeting signal type 1 (PTS1) receptor, Pex5pS and Pex5pL, are identified in mammals. Pex5pS and Pex5pL bind PTS1 proteins. Pex5pL, but not Pex5pS, directly interacts with the PTS2 receptor, Pex7p, carrying its cargo PTS2 protein in the cytosol. Pex5p carrying the cargos, PTS1 and PTS2, docks with the initial site Pex14p in a putative import machinery, subsequently translocating to other components such as Pex13p, Pex2p, Pex10p and Pex12p, whereby the matrix proteins are imported. The peroxins, Pex3p, Pex16p and Pex19p, function in the assembly of peroxisomal membrane vesicles that precedes the import of matrix proteins. Hence, peroxisomes may form de novo and do not have to arise from pre-existing, morphologically recognizable peroxisomes. Impaired peroxisome assembly causes peroxisome biogenesis disorders such as Zellweger syndrome.|Animals[MESH]|Humans[MESH]|Intracellular Membranes/metabolism[MESH]|Mammals[MESH]|Models, Biological[MESH]|Peroxisomal Disorders/*genetics/metabolism[MESH]|Peroxisomal Targeting Signal 2 Receptor[MESH]|Peroxisome-Targeting Signal 1 Receptor[MESH]|Peroxisomes/*genetics/metabolism[MESH]|Receptors, Cytoplasmic and Nuclear/metabolism[MESH] |