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Organelle Isolation By Magnetic Immunoabsorption.

A. Kausch, T. Owen, S. Narayanswami, B. Bruce
Published 1999 · Biology, Medicine

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Currently, most organelle isolation procedures rely on physical parameters and centrifugation for separation. Here, we report the rapid and gentle isolation of a variety of organelles by immunolabeling whole cell lysates with organelle-specific antibodies and streptavidin magnetic particles followed by separation in a magnetic field. Using magnetic immunoabsorption, we have been able to specifically label mouse metaphase chromosomes and a variety of plant organelles, including: amyloplasts, choroplasts and nuclei from whole cell lysates of various plant tissues. We find that the distinct magnetic properties, surface characteristics and mean diameter-size ranges of different particle preparations significantly influence their specific utility for organelle isolations. By using an internal-field magnetic separation device, we have developed a method for quantitative recovery of labeled organelles in microarrays and tested a variety of antibodies to chloroplast outer envelope proteins for their ability to immune-isolate chloroplasts.
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