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Reducing PEX13 expression ameliorates physiological defects of late-acting peroxin mutants.

Traffic. 2011 Jan;12(1):121-34. doi:10.1111/j.1600-0854.2010.01136.x. Epub 2010 Nov 24
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摘要


Proteins are targeted to the peroxisome matrix via processes that are mechanistically distinct from those used by other organelles. Protein entry into peroxisomes requires peroxin (PEX) proteins, including early-acting receptor (e.g. PEX5) and docking peroxins (e.g. PEX13 and PEX14) and late-acting PEX5-recycling peroxins (e.g. PEX4 and PEX6). We examined genetic interactions among Arabidopsis peroxin mutants and found that the weak pex13-1 allele had deleterious effects when combined with pex5-1 and pex14-2, which are defective in early-acting peroxins, as shown by reduced matrix protein import and enhanced physiological defects. In contrast, combining pex13-1 with pex4-1 or pex6-1, which are defective in late-acting peroxins, unexpectedly ameliorated mutant growth defects. Matrix protein import remained impaired in pex4-1 pex13-1 and pex6-1 pex13-1, suggesting that the partial suppression of pex4-1 and pex6-1 physiological defects by a weak pex13 allele may result from restoring the balance between import and export of PEX5 or other proteins that are retrotranslocated from the peroxisome with the assistance of PEX4 and PEX6. Our results suggest that symptoms caused by pex mutants defective in late-acting peroxins may result not only from defects in matrix protein import but also from inefficient removal of PEX5 from the peroxisomal membrane following cargo delivery. © 2010 John Wiley & Sons A/S.

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