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XCTK1: A Xenopus C-terminal Kinesin-like ProteinXCTK1 is 97kDa kinesin-like protein homologous to FKIF2 and KIFC3. XCTK1 is present at picomolar levels in eggs, embryos and cultured cells in a soluble high-molecular weight complex that is not associated with membranes. XCKT1 localizes to centrosomes in Xenopus A6 cells. Anti-XCTK1 antibodies also localize to spindle poles when injected into A6 cells or when added to extracts during in vitro spindle assembly reactions. XCTK1 is associated with the center of taxol-induced microtubule asters in extracts. Therefore its localization to poles is dependent on microtubule minus-ends and not on centrosomes per se. Overexpression of XCTK1 leads to centrosome destruction in cultured cells. XCTK1 was tagged at either the N- or C-terminus and transfected into Xenopus A6 cells At low expression levels, XCTK1 associated with centrosomes. At higher levels, the protein localized to insoluble cytoplasmic structures. Gamma-tubulin staining was dramatically decreased from centrosomes or altogether absent. The centrosomal SPJ antigen colocalized with XCTK1-containing structures. Upon nocodozole treatment, microtubules failed to regrow from the centrosomes indicating that overexpression of XCTK1 severely compromises centrosomal function. Current studies are aimed at determining whether XCTK1 interacts directly with centrosomal proteins and to determine the effects of XCTK1 depletion on oocyte maturation and embryogenesis.
Document ID
20020074608
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Winfree, Seth
(NASA Ames Research Center Moffett Field, CA United States)
Wilhelm, Heike
(European Molecular Biology Lab. Heidelberg, Germany)
Sawyer, Alan
(European Molecular Biology Lab. Heidelberg, Germany)
Karsenti, Eric
(European Molecular Biology Lab. Heidelberg, Germany)
Mitchison, Tim
(Harvard Medical School Boston, MA United States)
Walczak, Claire
(Indiana Univ. United States)
Reinsch, Sigrid
(NASA Ames Research Center Moffett Field, CA United States)
Dalton, Bonnie
Date Acquired
August 20, 2013
Publication Date
January 1, 2002
Subject Category
Life Sciences (General)
Meeting Information
Meeting: 9th International Xenopus Conference
Location: Cambridge
Country: United Kingdom
Start Date: August 21, 2002
End Date: August 25, 2002
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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