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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
In the yeast Hansenula polymorpha, peroxisome formation from the ER is independent of Pex19p, but involves the function of p24 proteins.
FEMS Yeast Research 2006 December
The peroxin Pex19p is important for the formation of functional peroxisomal membranes. Here we show that Hansenula polymorpha Pex19p is also required for peroxisome inheritance. Peroxisome inheritance is partly defective when Pex19p farnesylation is blocked, whereas deletion of PEX19 resulted in a severe defect in partitioning of peroxisomal structures. Time lapse imaging revealed that in newly formed buds, which had not inherited a peroxisome from the mother cell, new peroxisomes are formed that derive from the nuclear envelope/endoplasmic reticulum. This process was impaired upon deletion of EMP24 and ERP3, genes that encode p24 proteins. p24 Proteins are components of coated vesicles that mediate trafficking between the endoplasmic reticulum and Golgi apparatus. In an H. polymorpha wild-type background, deletion of EMP24 and ERP3 resulted in a strong reduction of organelle number in conjunction with an increase in the size of individual peroxisomes. This observation suggests that p24 proteins also play a role in peroxisome development in wild-type H. polymorpha cells.
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