Role of Pex19p in the targeting of PMP70 to peroxisome

Yoshinori Kashiwayama, Kota Asahina, Hiroyuki Shibata, Masashi Morita, Ania C. Muntau, Adelbert A. Roscher, Ronald J.A. Wanders, Nobuyuki Shimozawa, Masao Sakaguchi, Hiroaki Kato, Tsuneo Imanaka*

*この論文の責任著者

研究成果: ジャーナルへの寄稿学術論文査読

45 被引用数 (Scopus)

抄録

Pex19p is a protein required for the peroxisomal membrane synthesis. The 70-kDa peroxisomal membrane protein (PMP70) is synthesized on free cytosolic ribosomes and then inserted posttranslationally into peroxisomal membranes. Pex19p has been shown to play an important role in this process. Using an in vitro translation system, we investigated the role of Pex19p as a chaperone and identified the regions of PMP70 required for the interaction with Pex19p. When PMP70 was translated in the presence of purified Pex19p, a large part of PMP70 existed as soluble form and was co-immunoprecipitated with Pex19p. However, in the absence of Pex19p, PMP70 formed aggregates during translation. To identify the regions that interact with Pex19p, various truncated PMP70 were translated in the presence of Pex19p and subjected to co-immunoprecipitation. The interaction was markedly reduced by the deletion of the NH2-terminal 61 amino acids or the region around TMD6. Further, we expressed these deletion constructs of PMP70 in fusion with the green fluorescent protein in CHO cells. Fusion proteins lacking these Pex19p binding sites did not display any peroxisomal localization. These results suggest that Pex19p binds to PMP70 co-translationally and keeps PMP70 as a proper conformation for the localization to peroxisome.

本文言語英語
ページ(範囲)116-128
ページ数13
ジャーナルBBA - Molecular Cell Research
1746
2
DOI
出版ステータス出版済み - 2005/12/15

ASJC Scopus 主題領域

  • 分子生物学
  • 細胞生物学

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