Abstract
We have identified a novel Mr 36,000 protein (MSA-36) that has a complex cell cycle dependent distribution. This protein is first detected in interphase nuclei just prior to the onset of chromosome condensation. MSA-36 is found along condensing chromosomes and is a component of the centromere through metaphase. At anaphase, this protein is no longer detected in association with the chromosomes but appears at the forming stembodies and subsequently within the intercellular bridge at either side of the midbody. At the completion of cell division, the amount of MSA-36 in the bridge appears to decline concurrent with the appearance of this protein briefly within the reforming nucleus. To investigate whether MSA-36 is an active component of the chromosome or a passive passenger protein, we studied the behaviour of this protein in cells exhibiting premature chromosome condensation and in cells during and following recovery from mitotic arrest. These studies suggest that MSA-36 is not essential for a variety of major chromosome-associated events.
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by W.C. Earnshaw
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Rattner, J.B., Wang, T., Mack, G. et al. MSA-36: A chromosomal and mitotic spindle-associated protein. Chromosoma 101, 625–633 (1992). https://doi.org/10.1007/BF00360540
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DOI: https://doi.org/10.1007/BF00360540