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Yagita, Yuichi; Abe, Yuichi; Fujiki, Yukio
Journal of cell science, 04/2022Journal Article
Mammalian PEX16 has been considered essential for generating and maintaining peroxisomal membranes. This view is based primarily on the finding that fibroblasts from several PEX16-deficient patients are devoid of peroxisomal structures, but can form peroxisomes upon expression of PEX16. However, unlike these patient-derived cells, pex16 mutants in other model organisms contain partially functional peroxisomes. Here, we report that PEX16-KO cells derived from three mammalian cultured cell lines are comprised of cells containing a fewer number of enlarged peroxisomes and cells lacking peroxisomes. We also suggest that PEX16 accelerates the process by which peroxisome-less cells form peroxisomal membranes and subsequently establish mature peroxisomes, independently on its ability to mediate peroxisomal targeting of PEX3. Nevertheless, PEX16 is not absolutely required for this process. Moreover, a well-known patient-derived PEX16 mutant inhibits the de novo formation of peroxisomal membranes. Our findings suggest that although PEX16 is undoubtedly important for optimal peroxisomal membrane biogenesis, mammalian cells may be able to form peroxisomes de novo and maintain the organelles without the aid of PEX16.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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