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Aliases for SAR1B Gene

Aliases for SAR1B Gene

  • Secretion Associated, Ras Related GTPase 1B 2 3
  • SARA2 3 4 6
  • GTP-Binding Protein B 3 4
  • GTBPB 3 4
  • ANDD 3 6
  • CMRD 3 6
  • SAR1a Gene Homolog (S. Cerevisiae) 2 2
  • SAR1a Gene Homolog 2 (S. Cerevisiae) 2
  • SAR1 Homolog B (S. Cerevisiae) 2
  • GTP-Binding Protein SAR1b 3
  • GTP-Binding Protein Sara 3
  • SAR1a Gene Homolog 2 3
  • SAR1 Homolog B 3
  • 2310075M17Rik 3
  • EC 3.6.5 63
  • SARB 4

External Ids for SAR1B Gene

Previous Symbols for SAR1B Gene

  • SARA2

Summaries for SAR1B Gene

Entrez Gene Summary for SAR1B Gene

  • The protein encoded by this gene is a small GTPase that acts as a homodimer. The encoded protein is activated by the guanine nucleotide exchange factor PREB and is involved in protein transport from the endoplasmic reticulum to the Golgi. This protein is part of the COPII coat complex. Defects in this gene are a cause of chylomicron retention disease (CMRD), also known as Anderson disease (ANDD). Two transcript variants encoding the same protein have been found for this gene. [provided by RefSeq, Mar 2010]

GeneCards Summary for SAR1B Gene

SAR1B (Secretion Associated, Ras Related GTPase 1B) is a Protein Coding gene. Diseases associated with SAR1B include chylomicron retention disease and legionellosis. Among its related pathways are Class I MHC mediated antigen processing and presentation and TGF-Beta Pathway. GO annotations related to this gene include GTP binding and GTPase activity. An important paralog of this gene is SAR1A.

UniProtKB/Swiss-Prot for SAR1B Gene

  • Involved in transport from the endoplasmic reticulum to the Golgi apparatus. Activated by the guanine nucleotide exchange factor PREB. Involved in the selection of the protein cargo and the assembly of the COPII coat complex

Gene Wiki entry for SAR1B Gene

No data available for Tocris Summary , PharmGKB "VIP" Summary , fRNAdb sequence ontologies and piRNA Summary for SAR1B Gene

Genomics for SAR1B Gene

Genomic Location for SAR1B Gene

134,601,144 bp from pter
134,649,271 bp from pter
48,128 bases
Minus strand

Genomic View for SAR1B Gene

UCSC Golden Path with GeneCards custom track
Cytogenetic band:
Genomic Location for SAR1B Gene
GeneLoc Logo Genomic Neighborhood Exon StructureGene Density

RefSeq DNA sequence for SAR1B Gene

Regulatory Elements for SAR1B Gene

Proteins for SAR1B Gene

  • Protein details for SAR1B Gene (UniProtKB/Swiss-Prot)

    Protein Symbol:
    Recommended name:
    GTP-binding protein SAR1b
    Protein Accession:
    Secondary Accessions:
    • D3DQA4
    • Q567T4

    Protein attributes for SAR1B Gene

    198 amino acids
    Molecular mass:
    22410 Da
    Quaternary structure:
    • Homodimer. Binds PREB. Part of the COPII coat complex. Binds to the cytoplasmic tails of target proteins in the endoplasmic reticulum (By similarity).

neXtProt entry for SAR1B Gene

Proteomics data for SAR1B Gene at MOPED

Selected DME Specific Peptides for SAR1B Gene

Post-translational modifications for SAR1B Gene

  • Modification sites at PhosphoSitePlus
  • Modification sites at neXtProt

Other Protein References for SAR1B Gene

Domains for SAR1B Gene

Suggested Antigen Peptide Sequences for SAR1B Gene

GenScript: Design optimal peptide antigens:

Graphical View of Domain Structure for InterPro Entry



  • Belongs to the small GTPase superfamily. SAR1 family.:
    • Q9Y6B6
genes like me logo Genes that share domains with SAR1B: view

No data available for Gene Families for SAR1B Gene

Function for SAR1B Gene

Molecular function for SAR1B Gene

UniProtKB/Swiss-Prot Function: Involved in transport from the endoplasmic reticulum to the Golgi apparatus. Activated by the guanine nucleotide exchange factor PREB. Involved in the selection of the protein cargo and the assembly of the COPII coat complex

Enzyme Numbers (IUBMB) for SAR1B Gene

Gene Ontology (GO) - Molecular Function for SAR1B Gene

GO ID Qualified GO term Evidence PubMed IDs
GO:0003924 GTPase activity TAS --
GO:0004871 signal transducer activity --
GO:0005525 GTP binding IEA --
GO:0019001 guanyl nucleotide binding --
GO:0031683 G-protein beta/gamma-subunit complex binding --
genes like me logo Genes that share ontologies with SAR1B: view

Phenotypes for SAR1B Gene

genes like me logo Genes that share phenotypes with SAR1B: view

miRNA for SAR1B Gene

miRTarBase miRNAs that target SAR1B

No data available for Animal Models , Transcription Factor Targeting and HOMER Transcription for SAR1B Gene

Localization for SAR1B Gene

Subcellular locations from UniProtKB/Swiss-Prot for SAR1B Gene

Endoplasmic reticulum membrane; Peripheral membrane protein. Golgi apparatus, Golgi stack membrane; Peripheral membrane protein. Note=Associated with the endoplasmic reticulum and Golgi stacks, in particular in the juxta-nuclear Golgi region. {ECO:0000250}.

Subcellular locations from

Jensen Localization Image for SAR1B Gene COMPARTMENTS Subcellular localization image for SAR1B gene
Compartment Confidence
endoplasmic reticulum 5
golgi apparatus 5
cytosol 4
extracellular 2
nucleus 2
mitochondrion 1

Gene Ontology (GO) - Cellular Components for SAR1B Gene

GO ID Qualified GO term Evidence PubMed IDs
GO:0000139 Golgi membrane --
GO:0005622 intracellular --
GO:0005783 endoplasmic reticulum --
GO:0005789 endoplasmic reticulum membrane TAS --
GO:0005794 Golgi apparatus --
genes like me logo Genes that share ontologies with SAR1B: view

Pathways for SAR1B Gene

genes like me logo Genes that share pathways with SAR1B: view

Gene Ontology (GO) - Biological Process for SAR1B Gene

GO ID Qualified GO term Evidence PubMed IDs
GO:0002474 antigen processing and presentation of peptide antigen via MHC class I TAS --
GO:0006184 obsolete GTP catabolic process --
GO:0006886 intracellular protein transport IEA --
GO:0006888 ER to Golgi vesicle-mediated transport TAS --
GO:0007186 G-protein coupled receptor signaling pathway --
genes like me logo Genes that share ontologies with SAR1B: view

Compounds for SAR1B Gene

(3) HMDB Compounds for SAR1B Gene

Compound Synonyms Cas Number PubMed IDs
Guanosine diphosphate
  • 5'-GDP
Guanosine monophosphate
  • 5'-GMP
Guanosine triphosphate
  • 5'-GTP

(1) Drugbank Compounds for SAR1B Gene

Compound Synonyms Cas Number Type Actions PubMed IDs
146-91-8 target
genes like me logo Genes that share compounds with SAR1B: view

Transcripts for SAR1B Gene

Unigene Clusters for SAR1B Gene

SAR1 homolog B (S. cerevisiae):
Representative Sequences:

Alternative Splicing Database (ASD) splice patterns (SP) for SAR1B Gene

ExUns: 1a · 1b ^ 2 ^ 3 ^ 4 ^ 5 ^ 6 ^ 7 ^ 8a · 8b
SP2: -

Relevant External Links for SAR1B Gene

GeneLoc Exon Structure for
ECgene alternative splicing isoforms for

Expression for SAR1B Gene

mRNA expression in normal human tissues for SAR1B Gene

mRNA expression in embryonic tissues and stem cells from LifeMap Discovery

mRNA differential expression in normal tissues according to GTEx for SAR1B Gene

This gene is overexpressed in Muscle - Skeletal (5.5).

Integrated Proteomics: protein expression from ProteomicsDB, PaxDb, MOPED, and MaxQB for SAR1B Gene

SOURCE GeneReport for Unigene cluster for SAR1B Gene Hs.432984

mRNA Expression by UniProt/SwissProt for SAR1B Gene

Tissue specificity: Expressed in many tissues including small intestine, liver, muscle and brain
genes like me logo Genes that share expressions with SAR1B: view

Orthologs for SAR1B Gene

This gene was present in the common ancestor of eukaryotes.

Orthologs for SAR1B Gene

Organism Taxonomy Gene Similarity Type Details
(Pan troglodytes)
Mammalia SAR1B 35
  • 99.66 (n)
  • 99.49 (a)
SAR1B 36
  • 99 (a)
(Bos Taurus)
Mammalia SAR1B 35
  • 95.12 (n)
  • 98.48 (a)
SAR1B 36
  • 98 (a)
(Canis familiaris)
Mammalia SAR1B 35
  • 95.62 (n)
  • 98.99 (a)
SAR1B 36
  • 99 (a)
(Mus musculus)
Mammalia Sar1b 35
  • 90.4 (n)
  • 98.99 (a)
Sar1b 16
Sar1b 36
  • 99 (a)
(Monodelphis domestica)
Mammalia SAR1B 36
  • 85 (a)
(Ornithorhynchus anatinus)
Mammalia SAR1B 36
  • 84 (a)
(Rattus norvegicus)
Mammalia Sar1b 35
  • 90.4 (n)
  • 98.99 (a)
(Gallus gallus)
Aves SAR1B 35
  • 86.6 (n)
  • 97.42 (a)
SAR1B 36
  • 97 (a)
(Anolis carolinensis)
Reptilia SAR1B 36
  • 93 (a)
tropical clawed frog
(Silurana tropicalis)
Amphibia sar1b 35
  • 77.33 (n)
  • 84.77 (a)
rainbow trout
(Oncorhynchus mykiss)
Actinopterygii Omy.9028 35
(Danio rerio)
Actinopterygii CABZ01079045.1 36
  • 93 (a)
sar1b 35
  • 79.12 (n)
  • 91.92 (a)
African malaria mosquito
(Anopheles gambiae)
Insecta AgaP_AGAP004098 35
  • 63.54 (n)
  • 72.92 (a)
fruit fly
(Drosophila melanogaster)
Insecta sar1 35
  • 61.98 (n)
  • 72.4 (a)
sar1 36
  • 72 (a)
(Caenorhabditis elegans)
Secernentea sar-1 35
  • 62.35 (n)
  • 65.28 (a)
sar-1 36
  • 64 (a)
baker's yeast
(Saccharomyces cerevisiae)
Saccharomycetes SAR1 36
  • 61 (a)
Alicante grape
(Vitis vinifera)
eudicotyledons Vvi.1787 35
thale cress
(Arabidopsis thaliana)
eudicotyledons AT3G62560 35
  • 59.72 (n)
  • 62.5 (a)
(Hordeum vulgare)
Liliopsida Hv.3508 35
(Oryza sativa)
Liliopsida Os01g0254000 35
  • 57.24 (n)
  • 62.3 (a)
(Triticum aestivum)
Liliopsida Ta.7164 35
Species with no ortholog for SAR1B:
  • A. gosspyii yeast (Ashbya gossypii)
  • Actinobacteria (Mycobacterium tuberculosis)
  • African clawed frog (Xenopus laevis)
  • alpha proteobacteria (Wolbachia pipientis)
  • amoeba (Dictyostelium discoideum)
  • Archea (Pyrococcus horikoshii)
  • beta proteobacteria (Neisseria meningitidis)
  • bread mold (Neurospora crassa)
  • Chromalveolata (Phytophthora infestans)
  • common water flea (Daphnia pulex)
  • corn (Zea mays)
  • E. coli (Escherichia coli)
  • filamentous fungi (Aspergillus nidulans)
  • Firmicute bacteria (Streptococcus pneumoniae)
  • fission yeast (Schizosaccharomyces pombe)
  • green algae (Chlamydomonas reinhardtii)
  • honey bee (Apis mellifera)
  • K. lactis yeast (Kluyveromyces lactis)
  • loblloly pine (Pinus taeda)
  • malaria parasite (Plasmodium falciparum)
  • medicago trunc (Medicago Truncatula)
  • moss (Physcomitrella patens)
  • orangutan (Pongo pygmaeus)
  • pig (Sus scrofa)
  • rice blast fungus (Magnaporthe grisea)
  • schistosome parasite (Schistosoma mansoni)
  • sea anemone (Nematostella vectensis)
  • sea squirt (Ciona intestinalis)
  • sea squirt (Ciona savignyi)
  • sea urchin (Strongylocentrotus purpuratus)
  • sorghum (Sorghum bicolor)
  • soybean (Glycine max)
  • stem rust fungus (Puccinia graminis)
  • sugarcane (Saccharum officinarum)
  • tomato (Lycopersicon esculentum)
  • toxoplasmosis (Toxoplasma gondii)
  • Trichoplax (Trichoplax adhaerens)

Evolution for SAR1B Gene

Gene Tree for SAR1B (if available)
Gene Tree for SAR1B (if available)

Paralogs for SAR1B Gene

Paralogs for SAR1B Gene

genes like me logo Genes that share paralogs with SAR1B: view

Variants for SAR1B Gene

Sequence variations from dbSNP and Humsavar for SAR1B Gene

SNP ID Clin Chr 05 pos Sequence Context AA Info Type MAF
rs329297 -- 134,608,167(+) TAACT(C/G)ATCCT intron-variant
rs1061929 -- 134,605,403(-) GAATT(C/T)TTTTT utr-variant-3-prime
rs1063699 -- 134,607,022(-) GAAGT(C/T)TTCAT synonymous-codon, reference
rs1063710 -- 134,606,550(-) TGTCC(A/C)CCTAT utr-variant-3-prime
rs1063717 -- 134,606,472(-) TTTTT(C/T)TTATG utr-variant-3-prime

Structural Variations from Database of Genomic Variants (DGV) for SAR1B Gene

Variant ID Type Subtype PubMed ID
nsv520381 CNV Gain+Loss 19592680
nsv830491 CNV Loss 17160897
esv2667487 CNV Deletion 23128226

Relevant External Links for SAR1B Gene

HapMap Linkage Disequilibrium report
Human Gene Mutation Database (HGMD)

No data available for Polymorphic Variants from UniProtKB/Swiss-Prot for SAR1B Gene

Disorders for SAR1B Gene

(1) OMIM Diseases for SAR1B Gene (607690)


  • Chylomicron retention disease (CMRD) [MIM:246700]: An autosomal recessive disorder of severe fat malabsorption associated with failure to thrive in infancy. The condition is characterized by deficiency of fat-soluble vitamins, low blood cholesterol levels, and a selective absence of chylomicrons from blood. Affected individuals accumulate chylomicron-like particles in membrane-bound compartments of enterocytes, which contain large cytosolic lipid droplets. {ECO:0000269 PubMed:12692552, ECO:0000269 PubMed:17309654, ECO:0000269 PubMed:19274794}. Note=The disease is caused by mutations affecting the gene represented in this entry.

(2) University of Copenhagen DISEASES for SAR1B Gene

genes like me logo Genes that share disorders with SAR1B: view

Publications for SAR1B Gene

  1. Expression of Sara2 human gene in erythroid progenitors. (PMID: 15943909) Jardim D.L. … Costa F.F. (J. Biochem. Mol. Biol. 2005) 3 23
  2. Variable phenotypic expression of chylomicron retention disease in a kindred carrying a mutation of the Sara2 gene. (PMID: 19846172) CefalA^ A.B. … Averna M.R. (Metab. Clin. Exp. 2010) 3 23
  3. The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC). (PMID: 15489334) Gerhard D.S. … Malek J. (Genome Res. 2004) 3 4
  4. Anderson or chylomicron retention disease: molecular impact of five mutations in the SAR1B gene on the structure and the functionality of Sar1b protein. (PMID: 17945526) Charcosset M. … Lachaux A. (Mol. Genet. Metab. 2008) 3 23
  5. Anderson's disease (chylomicron retention disease): a new mutation in the SARA2 gene associated with muscular and cardiac abnormalities. (PMID: 18786134) Silvain M. … Samson-Bouma M.E. (Clin. Genet. 2008) 3 23

Products for SAR1B Gene

Sources for SAR1B Gene

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