Pex19 protein (IPR006708)

Short name: Pex19

Overlapping homologous superfamilies


Family relationships



Peroxisome(s) form an intracellular compartment, bounded by a typical lipid bilayer membrane. Peroxisome functions are often specialised by organism and cell type; two widely distributed and well-conserved functions are H2O2-based respiration and fatty acid beta-oxidation. Other functions include ether lipid (plasmalogen) synthesis and cholesterol synthesis in animals, the glyoxylate cycle in germinating seeds ("glyoxysomes"), photorespiration in leaves, glycolysis in trypanosomes ("glycosomes"), and methanol and/or amine oxidation and assimilation in some yeasts.

PEX genes encode the machinery ("peroxins") required to assemble the peroxisome. Membrane assembly and maintenance requires three of these (peroxins 3, 16, and 19) and may occur without the import of the matrix (lumen) enzymes. Matrix protein import follows a branched pathway of soluble recycling receptors, with one branch for each class of peroxisome targeting sequence (two are well characterised), and a common trunk for all. At least one of these receptors, Pex5p, enters and exits peroxisomes as it functions. Proliferation of the organelle is regulated by Pex11p. Peroxisome biogenesis is remarkably conserved among eukaryotes. A group of fatal, inherited neuropathologies are recognised as peroxisome biogenesis diseases.

GO terms

Biological Process

No terms assigned in this category.

Molecular Function

No terms assigned in this category.

Cellular Component

GO:0005777 peroxisome

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.