SAR1A

SAR1A (mammalian name) or Sar1 (yeast name) is a protein involved in membrane trafficking. It is a monomeric small GTPase found in COPII vesicles. It regulates the assembly and disassembly of COPII coats.

SAR1A
Available structures
PDBOrtholog search: PDBe RCSB
Identifiers
AliasesSAR1A, SAR1, SARA1, Sara, masra2, secretion associated Ras related GTPase 1A
External IDsOMIM: 607691 MGI: 98230 HomoloGene: 90897 GeneCards: SAR1A
Gene location (Human)
Chr.Chromosome 10 (human)[1]
Band10q22.1Start70,147,289 bp[1]
End70,170,523 bp[1]
Orthologs
SpeciesHumanMouse
Entrez

56681

20224

Ensembl

ENSG00000079332

ENSMUSG00000020088

UniProt

Q9NR31

P36536
Q99JZ4

RefSeq (mRNA)

NM_020150
NM_001142648

NM_009120
NM_001358487
NM_001358488

RefSeq (protein)

NP_001136120
NP_064535

NP_033146

Location (UCSC)Chr 10: 70.15 – 70.17 MbChr 10: 61.68 – 61.69 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

[GDP]-bound Sar1 interacts with the membrane-bound exchange factor Sec12 and exchanges its bound GDP for GTP. The hydrophobic N-terminus of Sar1-GTP then locates it to the membrane, where it serves as the binding site for the Sec23/Sec24 protein coat complex. After the vesicle coat is completely assembled and the vesicle is released from the donor membrane, the Sec23 subunit promotes Sar1 GTPase activity, which triggers the disassembly of the COPII coat.

See also

  • Overview of all the structural information available in the PDB for UniProt: Q9NR31 (uman GTP-binding protein SAR1a) at the PDBe-KB.


  1. GRCh38: Ensembl release 89: ENSG00000079332 - Ensembl, May 2017
  2. GRCm38: Ensembl release 89: ENSMUSG00000020088 - Ensembl, May 2017
  3. "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
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