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Originally published as MBC in Press, 10.1091/mbc.02-03-0034 on April 24, 2002
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Vol. 13, Issue 7, 2461-2473, July 2002

Large-Scale Isolation of Cajal Bodies from HeLa Cells

Yun Wah Lam, Carol E. Lyon, and Angus I. Lamond*

Wellcome Trust Biocentre, MSI/WTB Complex, University of Dundee, Dundee DD1 4HN, Scotland, United Kingdom

The Cajal body (CB) is a conserved, dynamic nuclear structure that is implicated in various cellular processes, such as the maturation of splicing small nuclear ribonucleoproteins and the assembly of transcription complexes. Here, we report the first procedure for the large-scale purification of CBs from HeLa cell nuclei, resulting in an ~750-fold enrichment of the CB marker protein p80-coilin. Immunofluorescence, immunoblotting, and mass spectrometric analyses showed that the composition of the isolated CBs was similar to that of CBs in situ. The morphology and structure of the isolated CBs, as judged by transmission and scanning electron microscopy analysis, are also similar to those of CBs in situ. This protocol demonstrates the feasibility of isolating intact distinct classes of subnuclear bodies from cultured cells in sufficient yield and purity to allow detailed characterization of their molecular composition, structure, and properties.

* Corresponding author. E-mail address: a.i.lamond{at}dundee.ac.uk.

Molecular Biology of the Cell
Vol. 13, 2461-2473, July 2002
Copyright © 2002 by The American Society for Cell Biology


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