POL30 / YBR088C Overview

Standard Name
POL30 1
Systematic Name
Feature Type
ORF , Verified
Proliferating cell nuclear antigen (PCNA); functions as the sliding replication clamp for DNA polymerase δ; may function as docking site for other proteins required for mitotic and meiotic chromosomal DNA replication and for DNA repair; PCNA ubiquitination at K164 plays crucial role during Okazaki fragment processing; Leu164 is essential for stable complex formation with replicative DNA polymerase δ 2 3 4 5
Name Description
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.

POL30 is located on the right arm of chromosome II between RFC5 Replication Factor C subunit and NHP6B high-mobility group (HMG) protein; dubious ORF YBR089W overlaps most of POL30 on the opposite strand; coding sequence is 777 nucleotides long with 7 synonymous SNPs
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.

PCNA is 258 amino acids long, longer-lived, very high in abundance; acetylated on K13, succinylated on K13, phosphorylated on 4 residues, sumoylated on 4 residues, ubiquitinylated on 4 lysines
Length (a.a.)
Mol. Weight (Da)
Isoelectric Point
Median Abundance (molecules/cell)
20407 +/- 5176
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 POL30 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.

Sliding clamp for DNA polymerase delta; involved in DNA replication and DNA repair processes it exists in a trimeric complex form.

View computational annotations

Molecular Function

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.

Essential gene; repression causes chromosome instability; point mutations confer increased mutation frequency, increased mitotic recombination, aberrant meiotic recombination, and resistance to HU and MMS; in a large-scale study, point mutants have reduced competitive fitness and display chromosome instability
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.

PCNA interacts physically with proteins involved in DNA repair and replication; POL30 interacts genetically with genes involved in DNA repair and transcription

939 total interactions for 478 unique genes

Physical Interactions

  • Affinity Capture-MS: 33
  • Affinity Capture-RNA: 3
  • Affinity Capture-Western: 35
  • Biochemical Activity: 23
  • Co-crystal Structure: 19
  • Co-fractionation: 2
  • Co-localization: 1
  • Co-purification: 3
  • FRET: 8
  • Protein-peptide: 4
  • Proximity Label-MS: 2
  • Reconstituted Complex: 79
  • Two-hybrid: 66

Genetic Interactions

  • Dosage Growth Defect: 3
  • Dosage Lethality: 2
  • Dosage Rescue: 28
  • Negative Genetic: 352
  • Phenotypic Enhancement: 49
  • Phenotypic Suppression: 33
  • Positive Genetic: 55
  • Synthetic Growth Defect: 52
  • Synthetic Lethality: 34
  • Synthetic Rescue: 53
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.

POL30 promoter is bound by Msn2p in response to heat; POL30 transcription is regulated by Sfp1p in response to stress; PCNA activity is regulated by Ubp10p and Ubp12p during mitotic S phase
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: 2007-06-05

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.