Reference: Williams C, et al. (2005) Saccharomyces cerevisiae Pex14p contains two independent Pex5p binding sites, which are both essential for PTS1 protein import. FEBS Lett 579(16):3416-20

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Abstract


Pex14p is a peroxisomal membrane-associated protein involved in docking of both Pex5p and Pex7p to the peroxisomal membrane. Previous studies have shown that, in humans, the N-terminal region of Pex14p interacts with WxxxF/Y motifs in Pex5p. Here, we report that Saccharomyces cerevisiae Pex14p contains two independent Pex5p binding sites, one in the N- and one in the C-terminus. Using deletion analysis we show that, in vivo, both of these interactions are needed for PTS1 import. Furthermore, we show that the characterized WxxxF/Y motifs of Pex5p are not essential for binding to the N-terminus of Pex14p but do play a role in the interaction with the Pex14 C-terminus. Thus, the data suggest that the mechanism of the Pex14p-Pex5p interaction in yeast is different from that previously reported for humans.

Reference Type
Journal Article
Authors
Williams C, van den Berg M, Distel B
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