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. 1992 Jan;3(1):29–47. doi: 10.1091/mbc.3.1.29

Yeast proteins associated with microtubules in vitro and in vivo.

G Barnes 1, K A Louie 1, D Botstein 1
PMCID: PMC275500  PMID: 1348005

Abstract

Conditions were established for the self-assembly of milligram amounts of purified Saccharomyces cerevisiae tubulin. Microtubules assembled with pure yeast tubulin were not stabilized by taxol; hybrid microtubules containing substoichiometric amounts of bovine tubulin were stabilized. Yeast microtubule-associated proteins (MAPs) were identified on affinity matrices made from hybrid and all-bovine microtubules. About 25 yeast MAPs were isolated. The amino-terminal sequences of several of these were determined: three were known metabolic enzymes, two were GTP-binding proteins (including the product of the SAR1 gene), and three were novel proteins not found in sequence databases. Affinity-purified antisera were generated against synthetic peptides corresponding to two of the apparently novel proteins (38 and 50 kDa). Immunofluorescence microscopy showed that both these proteins colocalize with intra- and extranuclear microtubules in vivo.

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