Abstract
We describe a new component of the kinetochore region of Chinese hamster ovary cells, which was characterised using a monoclonal antibody (mAb). This antigen was localised on the kinetochore regions of purified metaphase chromosomes, but in anaphase it was instead located on the polar microtubules in the midbody region, where they terminate in the stembody. It was not detectable in prophase or interphase cells by immunofluorescence, but was present in the interphase nucleus as shown by immunoblotting after SDS-polyacrylamide gel electrophoresis. The mAb recognised two polypeptides of Mr 140 000 and 155 000. The localisation of this antigen in metaphase on the kinetochore region, where the plus ends of the kinetochore microtubules are temporarily stabilised when they attach, and later in the stembody and midbody where the plus ends of the polar microtubules are stabilised in anaphase and telophase, suggests that it could play a role in stabilising the plus ends of microtubules and thus in the control of microtubule dynamics during mitosis.
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Pankov, R., Lemieux, M. & Hancock, R. An antigen located in the kinetochore region in metaphase and on polar microtubule ends in the midbody region in anaphase, characterised using a monoclonal antibody. Chromosoma 99, 95–101 (1990). https://doi.org/10.1007/BF01735324
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DOI: https://doi.org/10.1007/BF01735324