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Pix1 and Pix2 are novel WD40 microtubule-associated proteins that colocalize with mitochondria in Xenopus germ plasm and centrosomes in human cells
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Hames, Rebecca S., Hames, Richard, Prosser, Suzanna L., Euteneuer, Ursula, Lopes, Carla A. M., Moore, Wendy, Woodland, Hugh R. and Fry, Andrew M. (2008) Pix1 and Pix2 are novel WD40 microtubule-associated proteins that colocalize with mitochondria in Xenopus germ plasm and centrosomes in human cells. Experimental Cell Research, Volume 314 (Number 3). pp. 574-589. doi:10.1016/j.yexcr.2007.10.019 ISSN 0014-4827.
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Official URL: http://dx.doi.org/10.1016/j.yexcr.2007.10.019
Abstract
In many animals, the germ line develops from a distinct mitochondria-rich region of embryonic cytoplasm called the germ plasm. However, the protein composition of germ plasm and its formation remain poorly understood, except in Drosophila. Here, we show that Xpat, a recently identified protein component of Xenopus germ plasm, interacts via its C-terminal domain with a novel protein, xPix1. Xpat and xPix1 are co-expressed in ovaries, eggs and early embryos and colocalize to the mitochondrial cloud and germ plasm in stage I and stage VI oocytes, respectively. Although Xpat appears unique to Xenopus, Pix proteins, which contain an N-terminal WD40 domain and C-terminal coiled-coil, are widely conserved. In humans, two proteins, Pix1 and Pix2, are expressed at varying levels in different cancer cell lines. Importantly, as well as localizing to mitochondria, human Pix proteins localize to centrosomes and associate with microtubules in vitro and in vivo. Although, Pix proteins are stably expressed through the cell cycle, Pix2 concentrates on microtubule structures in mitosis and microinjection of Fix antibodies interferes with cell division. Based on these data, we propose that Pix1 and Pix2 are microtubule-associated adaptor proteins that likely contribute to a range of developmental and cell division processes. (c) 2007 Elsevier Inc. All rights reserved.
| Item Type: | Journal Article | ||||
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| Subjects: | Q Science > QH Natural history > QH301 Biology Q Science > QH Natural history > QH426 Genetics |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- ) > Biological Sciences ( -2010) | ||||
| Library of Congress Subject Headings (LCSH): | Centrosomes, Xenopus, Cells -- Germplasm resources, Mitochondria, Microtubules, Cell division | ||||
| Journal or Publication Title: | Experimental Cell Research | ||||
| Publisher: | Academic Press | ||||
| ISSN: | 0014-4827 | ||||
| Official Date: | 1 February 2008 | ||||
| Dates: |
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| Volume: | Volume 314 | ||||
| Number: | Number 3 | ||||
| Number of Pages: | 16 | ||||
| Page Range: | pp. 574-589 | ||||
| DOI: | 10.1016/j.yexcr.2007.10.019 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | Wellcome Trust (London, England), Biotechnology and Biological Sciences Research Council (Great Britain) (BBSRC) |
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