1887

Abstract

An excentric position of the nuclei, random orientation of mitoses, and multinuclear budding cells were identified in part of a population of temperature-sensitive (ts) Saccharomyces cerevisiae actin mutants at the permissive temperature of 23 ° by fluorescence and electron microscopy. The phenotype resembled that of mutants in -tubulin, dynein, JNM1, NUM1, ACT3, ACT5, myosins, profilin, tropomyosin 1, SLA2 and other genes. The question was addressed whether the cause was (i) defects in cell polarity in some ts actin mutants, manifested by lack of asymmetry of actin cortical patches, or (ii) lack of cytoplasmic or astral microtubules. The results indicated that in the cells with the nuclear defects, actin cortical patches showed the normal asymmetric distribution typical of undisturbed polarity. Cytoplasmic, astral and spindle microtubules were also preserved. The principal difference found between the wild-type and actin mutant cells was in actin cables, which in the actin mutants were developed insufficiently. It is suggested that actin cables serve as a ‘suspensory apparatus’ and/or ‘intracellular corridor’, predetermining: the location of the nucleus in the central position in interphase; the axis of nuclear movement to the bud neck before mitosis; the direction of the elongating nucleus during mitosis; and the motion of each nucleus from an excentric to a central position during cytokinesis, in cooperation with the above-mentioned and other gene products.

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1998-07-01
2021-05-14
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