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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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PEX19 is a predominantly cytosolic chaperone and import receptor for class 1 peroxisomal membrane proteins.

Integral peroxisomal membrane proteins (PMPs) are synthesized in the cytoplasm and imported posttranslationally. Here, we demonstrate that PEX19 binds and stabilizes newly synthesized PMPs in the cytosol, binds to multiple PMP targeting signals (mPTSs), interacts with the hydrophobic domains of PMP targeting signals, and is essential for PMP targeting and import. These results show that PEX19 functions as both a chaperone and an import receptor for newly synthesized PMPs. We also demonstrate the existence of two PMP import mechanisms and two classes of mPTSs: class 1 mPTSs, which are bound by PEX19 and imported in a PEX19-dependent manner, and class 2 mPTSs, which are not bound by PEX19 and mediate protein import independently of PEX19.[1]

References

  1. PEX19 is a predominantly cytosolic chaperone and import receptor for class 1 peroxisomal membrane proteins. Jones, J.M., Morrell, J.C., Gould, S.J. J. Cell Biol. (2004) [Pubmed]
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