Requirement for microtubules and dynein motors in the earliest stages of peroxisome biogenesis

被引:17
作者
Brocard, CB
Boucher, KK
Jedeszko, C
Kim, PK
Walton, PA [1 ]
机构
[1] Univ Western Ontario, Dept Anat & Cell Biol, London, ON N6A 5C1, Canada
[2] NICHHD, Unit Organelle Biol, Cell Biol & Metab Branch, NIH, Bethesda, MD 20892 USA
关键词
dynactin; microinjection; motor proteins; organelle; p150Glued;
D O I
10.1111/j.1600-0854.2005.00283.x
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Our aim was to determine the role of microtubules in the biogenesis of peroxisomes. Fusion experiments between human PEX16- and PEX1-mutant cells in the presence of nocodazol implied that microtubules were not required for import of proteins into the peroxisomal matrix after cell fusion complementation. We further studied the importance of microtubules in the early stages of peroxisome biogenesis following the microinjection complementation of PEX16-mutant cells. In the absence of nocodazol, nuclear microinjection of plasmids expressing EGFP-SKL and Pex16p in PEX16-mutant cells resulted in the accumulation of EGFP-SKL into newly formed peroxisomes. However, pretreatment of the cells with nocodazol, prior to microinjection, resulted in the inhibition of complementation of the PEX16 mutant and the cytosolic location of the EGFP-SKL. In addition, coexpression of a dominant-negative CC1 subunit of the dynein/dynactin motor complex resulted in the inability to complement PEX16-mutant cells. Both of these treatments resulted in the cytosolic localization of expressed Pex16p. Our results demonstrate that the formation of peroxisomes via the preperoxisomal compartment is dependent upon microtubules and minus-end-directed motor proteins and that the inhibition described above occurs at a step that precedes the association of Pex16p with the vesicles that would otherwise become the peroxisomes.
引用
收藏
页码:386 / 395
页数:10
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