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. 1992 Oct;100(2):740–748. doi: 10.1104/pp.100.2.740

Induction of Cold Stability of Microtubules in Cultured Tobacco Cells

Koichi Mizuno 1
PMCID: PMC1075621  PMID: 16653054

Abstract

In suspension-cultured tobacco (Nicotiana tabacum) cells, we have often encountered cold-stable microtubules (MTs). The cold-stable MTs were found in the pelleted fraction of tobacco cell homogenates. These cold-stable MTs were shown to be accompanied by unidentified filamentous structures that extended along part of their length. However, during the early hours in culture such cold-stable MTs were never observed. They were detectable from 120 h after the beginning of subculture and then their numbers increased gradually. The number of cells with cold-stable MTs eventually accounted for more than 95% of the total population of cells at the stationary phase of culture. The rapid loss of cold stability of MTs occurred when such cells were transferred to fresh medium for subculture. However, if the fresh medium was supplemented with once-used medium, the cold stability of MTs was retained. The active agent in the medium appeared to be of low molecular weight and to be heat resistant. A similar activity was detected in a pectin hydrolyzate. When an inhibitor of protein kinase, either 6-dimethylaminopurine or staurosporin, was added to the cells at an early stage of culture, when cold-stable MTs were normally completely absent, most cells acquired cold-stable MTs. It appears that acquisition or loss of cold stability of MTs in tobacco cells is regulated by the action of a kinase/phosphatase or a phosphorylation/dephosphorylation system on some MT protein(s), such as a cold stabilizer of MTs, some unidentified MT-associated filamentous structure, or even tubulin itself.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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