BAIT

NPA3

EPA1, GPN1, GTPase NPA3, YJR072C
Member of the conserved GPN-loop GTPase family; has a role in transport of RNA polymerase II to the nucleus; exhibits GTP-dependent binding to PolII; has ATPase activity; involved in sister chromatid cohesion; phosphorylated by the Pcl1p-Pho85p kinase complex; human homolog XAB1 interacts with human RNA polymerase II; protein abundance increases in response to DNA replication stress
GO Process (3)
GO Function (2)
GO Component (2)

Gene Ontology Biological Process

Gene Ontology Molecular Function

Gene Ontology Cellular Component

Saccharomyces cerevisiae (S288c)
PREY

BUD27

URI1, S000007647, YFL023W
Unconventional prefoldin protein involved in translation initiation; required for correct assembly of RNAP I, II, and III in an Rpb5p-dependent manner; shuttles between nucleus and cytoplasm; mutants have inappropriate expression of nutrient sensitive genes due to translational derepression of Gcn4p transcription factor; diploid mutants show random budding; ortholog of human URI/RMP
GO Process (4)
GO Function (0)
GO Component (2)

Gene Ontology Biological Process

Gene Ontology Cellular Component

Saccharomyces cerevisiae (S288c)

Synthetic Growth Defect

A genetic interaction is inferred when mutations in separate genes, each of which alone causes a minimal phenotype, result in a significant growth defect under a given condition when combined in the same cell.

Publication

Characterization of the carboxy-terminal domain of the GPN-loop GTPase Npa3 reveals an intrinsically disordered region and phosphorylation-dependent regulation in the absence of BUD27.

Ochoa-Valdez MJ, Mora-Garcia M, Paez-Perez ED, Gonzalez-Contreras BE, Rebolloso-Gomez Y, Riego-Ruiz LR, Calera MR, Sanchez-Olea R

Yeast GPN-loop GTPase 1 (Npa3) is a member of the GPN-loop GTPase family involved in RNA polymerase II (RNAPII) assembly and nuclear targeting. Npa3 features a GTPase core and an enlarged carboxy-terminal domain (CTD) that is conserved in all eukaryotic orthologs but absent from the archaeal Gpn protein. We previously showed that Npa3 possesses additional cellular functions unrelated to RNAPII ... [more]

FEBS J Dec. 01, 2025; 292(24);6670-6695 [Pubmed: 40788873]

Throughput

  • Low Throughput

Ontology Terms

  • vegetative growth (APO:0000106)
  • resistance to chemicals (APO:0000087)

Related interactions

InteractionExperimental Evidence CodeDatasetThroughputScoreCurated ByNotes
NPA3 BUD27
Affinity Capture-MS
Affinity Capture-MS

An interaction is inferred when a bait protein is affinity captured from cell extracts by either polyclonal antibody or epitope tag and the associated interaction partner is identified by mass spectrometric methods.

High2BioGRID
3613051
NPA3 BUD27
Negative Genetic
Negative Genetic

Mutations/deletions in separate genes, each of which alone causes a minimal phenotype, but when combined in the same cell results in a more severe fitness defect or lethality under a given condition. This term is reserved for high or low throughput studies with scores.

Low-BioGRID
3403536

Curated By

  • BioGRID