Tubulin isotypes optimize distinct spindle positioning mechanisms during yeast mitosis.
J Cell Biol
; 220(12)2021 12 06.
Article
em En
| MEDLINE
| ID: mdl-34739032
ABSTRACT
Microtubules are dynamic cytoskeleton filaments that are essential for a wide range of cellular processes. They are polymerized from tubulin, a heterodimer of α- and ß-subunits. Most eukaryotic organisms express multiple isotypes of α- and ß-tubulin, yet their functional relevance in any organism remains largely obscure. The two α-tubulin isotypes in budding yeast, Tub1 and Tub3, are proposed to be functionally interchangeable, yet their individual functions have not been rigorously interrogated. Here, we develop otherwise isogenic yeast strains expressing single tubulin isotypes at levels comparable to total tubulin in WT cells. Using genome-wide screening, we uncover unique interactions between the isotypes and the two major mitotic spindle positioning mechanisms. We further exploit these cells to demonstrate that Tub1 and Tub3 optimize spindle positioning by differentially recruiting key components of the Dyn1- and Kar9-dependent mechanisms, respectively. Our results provide novel mechanistic insights into how tubulin isotypes allow highly conserved microtubules to function in diverse cellular processes.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Saccharomyces cerevisiae
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Proteínas de Saccharomyces cerevisiae
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Mitose
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Fuso Acromático
Idioma:
En
Revista:
J Cell Biol
Ano de publicação:
2021
Tipo de documento:
Article