Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2004-7-28
pubmed:abstractText
In fission yeast, gamma-tubulin (encoded by the gtb1+ gene), Alp4 (Spc97/GCP2), and Alp6 (Spc98/GCP3) are essential components of the gamma-tubulin complex. We isolated gtb1 mutants as allele-specific suppressors of temperature-sensitive alp4 mutations. Mutation sites in gtb1 mutants and in several alp4 alleles were determined. The majority of substituted amino acids were mapped to a small area on the predicted surface of the gamma-tubulin molecule that might directly interact with the Alp4 protein. The cold sensitivity of gamma-tubulin mutants was almost completely suppressed by an alpha-tubulin mutation and partially suppressed by a low concentration of thiabendazole, a microtubule assembly inhibitor. Other gtb1 mutants had increased resistance to this drug. Gel-filtration and immunoprecipitation analyses suggested that the mutant gamma-tubulin formed an altered gamma-tubulin complex with increased stability compared to wild-type gamma-tubulin. In most gtb1 mutants, sexual development was impaired, and aberrant asci that contained an irregular spore shape and number were produced. In contrast, spore formation was not appreciably damaged in some alp4 and alp6 mutants, even at temperatures where vegetative proliferation was substantially defective. These results suggested that the function of the gamma-tubulin complex or the requirement of each component of the complex is differentially regulated between the vegetative and sexual phases of the life cycle in fission yeast. In addition, genetic data indicated intimate functional connections of gamma-tubulin with several kinesin-like proteins.
pubmed:commentsCorrections
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pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0016-6731
pubmed:author
pubmed:issnType
Print
pubmed:volume
167
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1095-107
pubmed:dateRevised
2009-11-18
pubmed:meshHeading
pubmed:year
2004
pubmed:articleTitle
Functional dissection of the gamma-tubulin complex by suppressor analysis of gtb1 and alp4 mutations in Schizosaccharomyces pombe.
pubmed:affiliation
Kazusa DNA Research Institute, Kisarazu, Chiba 292-0818, Japan.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, Non-U.S. Gov't