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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
Penicillium chrysogenum Pex5p mediates differential sorting of PTS1 proteins to microbodies of the methylotrophic yeast Hansenula polymorpha.
We have isolated the Penicillium chrysogenum pex5 gene encoding the receptor for microbody matrix proteins containing a type 1 peroxisomal targeting signal (PTS1). Pc-pex5 contains 2 introns and encodes a protein of approximately 75 kDa. P. chrysogenum pex5 disruptants appear to be highly unstable, show poor growth, and are unable to sporulate asexually. Furthermore, pex5 cells mislocalize a fluorescent PTS1 reporter protein to the cytosol. Pc-pex5 was expressed in a PEX5 null mutant of the yeast Hansenula polymorpha. Detailed analysis demonstrated that the PTS1 proteins dihydroxyacetone synthase and catalase were almost fully imported into microbodies. Surprisingly, alcohol oxidase, which also depends on Pex5p for import into microbodies, remained mainly in the cytosol. Thus, P. chrysogenum Pex5p has a different specificity of cargo recognition than its H. polymorpha counterpart. This was also suggested by the observation that Pc-Pex5p sorted a reporter protein fused to various functional PTS1 signals with different efficiencies.[1]
