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Sar1b - secretion associated Ras related GTPase 1B (house mouse)

Gene
Symbol
Dates
  • Create:
    2016-09-14
  • Modify:
    2025-01-29
Description
Predicted to enable G protein activity and amino acid sensor activity. Involved in lipid export from cell and lipoprotein transport. Predicted to be located in cytosol. Predicted to be part of COPII vesicle coat. Predicted to be active in endoplasmic reticulum exit site and lysosomal membrane. Is expressed in cerebral cortex intermediate zone; cerebral cortex subventricular zone; cerebral cortex ventricular layer; cortical plate; and cortical preplate. Used to study chylomicron retention disease. Human ortholog(s) of this gene implicated in chylomicron retention disease. Orthologous to human SAR1B (secretion associated Ras related GTPase 1B).

1 Names and Identifiers

1.1 Synonyms

  • 2310075M17Rik
  • 2900019I22Rik
  • CMRD
  • Sara1b
  • Sara2
  • Sarb
  • small COPII coat GTPase SAR1B
  • GTP-binding protein SAR1b
  • SAR1 gene homolog B
  • SAR1a gene homolog 2
  • SAR1b gene homolog

1.2 Other Identifiers

1.2.1 Ensembl ID

1.2.2 Alliance Gene ID

1.2.3 Bgee Gene ID

1.2.4 Enzyme Commission (EC) Number

1.2.5 GlyCosmos Gene

1.2.6 MGI ID

1.2.7 VEuPathDB ID

1.2.8 Wikidata

3 Proteins

3.1 Protein Function

Small GTPase that cycles between an active GTP-bound and an inactive GDP-bound state and mainly functions in vesicle-mediated endoplasmic reticulum (ER) to Golgi transport. The active GTP-bound form inserts into the endoplasmic reticulum membrane where it recruits the remainder of the coat protein complex II/COPII. The coat protein complex II assembling and polymerizing on endoplasmic reticulum membrane is responsible for both the sorting of cargos and the deformation and budding of membranes into vesicles destined to the Golgi (By similarity). In contrast to SAR1A, SAR1B specifically interacts with the cargo receptor SURF4 to mediate the transport of lipid-carrying lipoproteins including APOB and APOA1 from the endoplasmic reticulum to the Golgi and thereby, indirectly regulates lipid homeostasis (PMID: 33186557). In addition to its role in vesicle trafficking, can also function as a leucine sensor regulating TORC1 signaling and more indirectly cellular metabolism, growth and survival. In absence of leucine, interacts with the GATOR2 complex via MIOS and inhibits TORC1 signaling. The binding of leucine abrogates the interaction with GATOR2 and the inhibition of the TORC1 signaling. This function is completely independent of the GTPase activity of SAR1B (By similarity).

3.2 Protein 3D Structures

3.2.1 AlphaFold Structures

Highly accurate protein structure prediction with AlphaFold. Nature. 2021 Aug;596(7873):583-589. DOI:10.1038/s41586-021-03819-2. PMID:34265844; PMCID:PMC8371605

3.3 Protein Targets

4 BioAssays

4.1 RNAi BioAssays

5 Interactions and Pathways

5.1 Interactions

5.2 Pathways

6 Biochemical Reactions

7 Expression

8 Literature

8.1 Consolidated References

8.2 Gene-Chemical Co-Occurrences in Literature

8.3 Gene-Gene Co-Occurrences in Literature

8.4 Gene-Disease Co-Occurrences in Literature

9 Patents

9.1 Gene-Chemical Co-Occurrences in Patents

9.2 Gene-Gene Co-Occurrences in Patents

9.3 Gene-Disease Co-Occurrences in Patents

10 Classification

10.1 Gene Ontology: Biological Process

10.2 Gene Ontology: Cellular Component

10.3 Gene Ontology: Molecular Function

11 Information Sources

  1. NCBI Gene
    LICENSE
    NCBI Website and Data Usage Policies and Disclaimers
    https://www.ncbi.nlm.nih.gov/home/about/policies/
  2. PubChem
  3. Alliance of Genome Resources
    LICENSE
    All annotations and data produced by Alliance members that are accessible from alliancegenome.org are distributed under a CC BY 4.0 license (https://creativecommons.org/licenses/by/4.0/).
    https://www.alliancegenome.org/privacy-warranty-licensing
  4. BioGRID
    LICENSE
    The MIT License (MIT); Copyright Mike Tyers Lab
    https://wiki.thebiogrid.org/doku.php/terms_and_conditions
  5. STRING: functional protein association networks
  6. GlyCosmos Glycoscience Portal
    LICENSE
    All copyrightable parts of the datasets in GlyCosmos are under the Creative Commons Attribution (CC BY 4.0) License.
    https://glycosmos.org/license
  7. Mouse Genome Informatics (MGI)
    LICENSE
    MGI data and annotations are licensed under a Creative Commons Attribution 4.0 International License (CC-BY).
    https://www.informatics.jax.org/mgihome/other/copyright.shtml
  8. NCBI Gene Expression Omnibus (GEO)
  9. Swiss Institute of Bioinformatics Bgee
    LICENSE
    Creative Commons Zero license (CC0)
    https://www.bgee.org/about/
  10. UniProt
    LICENSE
    We have chosen to apply the Creative Commons Attribution (CC BY 4.0, http://creativecommons.org/licenses/by/4.0/) License to all copyrightable parts of our databases.
    https://www.uniprot.org/help/license
  11. VEuPathDB: The Eukaryotic Pathogen, Vector and Host Informatics Resource
    LICENSE
    All data on VEuPathDB websites are provided freely for public use.
    https://veupathdb.org/veupathdb/app/static-content/about.html
  12. Wikidata
  13. Gene Ontology (GO)
    LICENSE
    Gene Ontology Consortium data and data products are licensed under the Creative Commons Attribution 4.0 Unported License (https://creativecommons.org/licenses/by/4.0/legalcode)
    http://geneontology.org/docs/go-citation-policy/
  14. AlphaFold DB
    LICENSE
    All of the data provided is freely available for both academic and commercial use under Creative Commons Attribution 4.0 (CC-BY 4.0) licence terms.
    https://alphafold.ebi.ac.uk/faq
  15. Rhea - annotated reactions database
    LICENSE
    Rhea has chosen to apply the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/). This means that you are free to copy, distribute, display and make commercial use of the database in all legislations, provided you credit (cite) Rhea.
    https://www.rhea-db.org/help/license-disclaimer
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