TUB3 / YML124C Overview

Standard Name
TUB3 1
Systematic Name
Feature Type
ORF , Verified
Alpha-tubulin; associates with beta-tubulin (Tub2p) to form tubulin dimer, which polymerizes to form microtubules; expressed at lower level than Tub1p; TUB3 has a paralog, TUB1, that arose from the whole genome duplication 2 3
Name Description
TUBulin 1
TUB1 3
Comparative Info
Sequence Details


The S. cerevisiae Reference Genome sequence is derived from laboratory strain S288C. Download DNA or protein sequence, view genomic context and coordinates. Click "Sequence Details" to view all sequence information for this locus, including that for other strains.

TUB3 is on the left arm of chromosome XIII near the telomere between PGA3 cytochrome b5 reductase and PHO84 phosphate transporter; coding sequence is 1636 nucleotides long with 9 SNPs, one of which leads to an amino acid polymorphism, and an intron at 26..323 with 3 additional SNPs; TUB3 has paralog TUB1 from the whole genome duplication
Protein Details


Basic sequence-derived (length, molecular weight, isoelectric point) and experimentally-determined (median abundance, median absolute deviation) protein information. Click "Protein Details" for further information about the protein such as half-life, abundance, domains, domains shared with other proteins, protein sequence retrieval for various strains, physico-chemical properties, protein modification sites, and external identifiers for the protein.

Alpha-tubulin Tub3p is 447 amino acids long, long-lived, and low in abundance; contains 13 alpha tubulin domains; phosphorylated on 3 serines, sumoylated on 2 lysines; associates with beta-tubulin Tub2p to form tubulin dimer
Length (a.a.)
Mol. Weight (Da)
Isoelectric Point
Median Abundance (molecules/cell)
5294 +/- 2118
Half-life (hr)


Curated mutant alleles for the specified gene, listed alphabetically. Click on the allele name to open the allele page. Click "SGD search" to view all alleles in search results. Click "YeastMine" to view all alleles in YeastMine.

View all TUB3 alleles in SGD search | YeastMine

Gene Ontology Details

Gene Ontology

GO Annotations consist of four mandatory components: a gene product, a term from one of the three Gene Ontology (GO) controlled vocabularies (Molecular Function, Biological Process, and Cellular Component), a reference, and an evidence code. SGD has manually curated and high-throughput GO Annotations, both derived from the literature, as well as computational, or predicted, annotations. Click "Gene Ontology Details" to view all GO information and evidence for this locus as well as biological processes it shares with other genes.

Structural constituent of the cytoskeleton; putative involvement in mitotic sister chromatid segregation, homologous chromosome segregation in meiosis I and nuclear migration; subunit of the tubular complex; localizes to cytoplasmic, nuclear and kinetochore microtubules

View computational annotations

Molecular Function

Manually Curated

Biological Process

Manually Curated

Cellular Component

Manually Curated


Macromolecular complex annotations are imported from the Complex Portal. These annotations have been derived from physical molecular interaction evidence extracted from the literature and cross-referenced in the entry, or by curator inference from information on homologs in closely related species or by inference from scientific background.

Phenotype Details


Phenotype annotations for a gene are curated single mutant phenotypes that require an observable (e.g., "cell shape"), a qualifier (e.g., "abnormal"), a mutant type (e.g., null), strain background, and a reference. In addition, annotations are classified as classical genetics or high-throughput (e.g., large scale survey, systematic mutation set). Whenever possible, allele information and additional details are provided. Click "Phenotype Details" to view all phenotype annotations and evidence for this locus as well as phenotypes it shares with other genes.

Non-essential gene; null is sensitive to benomyl, cordycepin, cadmium, caffeine, cycloheximide, and nocodazole; null is resistant to MMS, HU, bleomycin; homozygous null shows increased respiratory growth
Disease Details


Disease Annotations consist of three mandatory components: a gene product, a term from the Disease Ontology (DO) controlled vocabulary and an evidence code. SGD provides manually curated DO Annotations derived from the literature. Click "Disease Details" to view all Disease information and evidence for this locus as well as diseases it shares with other genes.

Yeast TUB3 is homologous to human TUBA1A, TUBA1B, TUBA1C, and TUBA4A and has been used to study a variety of diseases including leukemia, Alzheimer's disease, lissencephaly, osteoblastoma, lung and breast cancers, macrothrombocytopenia, and amyotrophic lateral sclerosis type 22
Interaction Details


Interaction annotations are curated by BioGRID and include physical or genetic interactions observed between at least two genes. An interaction annotation is composed of the interaction type, name of the interactor, assay type (e.g., Two-Hybrid), annotation type (e.g., manual or high-throughput), and a reference, as well as other experimental details. Click "Interaction Details" to view all interaction annotations and evidence for this locus, including an interaction visualization.

Tub3p interacts physically with proteins involved in translation, TUB3 interacts genetically with genes involved in mitosis; the tub3 null mutant is viable; the null mutant of paralog tub1 is inviable; the tub3 tub1 double mutant is inviable.

758 total interactions for 494 unique genes

Physical Interactions

  • Affinity Capture-MS: 109
  • Affinity Capture-RNA: 5
  • Affinity Capture-Western: 3
  • Co-localization: 2
  • Co-purification: 1
  • Reconstituted Complex: 2
  • Two-hybrid: 7

Genetic Interactions

  • Dosage Rescue: 7
  • Negative Genetic: 393
  • Phenotypic Enhancement: 3
  • Phenotypic Suppression: 1
  • Positive Genetic: 159
  • Synthetic Growth Defect: 20
  • Synthetic Lethality: 42
  • Synthetic Rescue: 4
Regulation Details


The number of putative Regulators (genes that regulate it) and Targets (genes it regulates) for the given locus, based on experimental evidence. This evidence includes data generated through high-throughput techniques. Click "Regulation Details" to view all regulation annotations, shared GO enrichment among regulation Targets, and a regulator/target diagram for the locus.

TUB3 promoter is bound by Med2p and Reb1p in response to heat; TUB3 transcription is regulated by Sfp1p in response to stress
Expression Details


Expression data are derived from records contained in the Gene Expression Omnibus (GEO), and are first log2 transformed and normalized. Referenced datasets may contain one or more condition(s), and as a result there may be a greater number of conditions than datasets represented in a single clickable histogram bar. The histogram division at 0.0 separates the down-regulated (green) conditions and datasets from those that are up-regulated (red). Click "Expression Details" to view all expression annotations and details for this locus, including a visualization of genes that share a similar expression pattern.

Summary Paragraph

A summary of the locus, written by SGD Biocurators following a thorough review of the literature. Links to gene names and curated GO terms are included within the Summary Paragraphs.

Last Updated: 2003-12-18

Literature Details


All manually curated literature for the specified gene, organized into topics according to their relevance to the gene (Primary Literature, Additional Literature, or Review). Click "Literature Details" to view all literature information for this locus, including shared literature between genes.