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General description of the gene and the encoded protein(s) using information from HGNC and Ensembl, as well as predictions made by the Human Protein Atlas project.
Gene namei
Official gene symbol, which is typically a short form of the gene name, according to HGNC.
Assigned HPA protein class(es) for the encoded protein(s).
Disease related genes Human disease related genes Plasma proteins
Predicted locationi
All transcripts of all genes have been analyzed regarding the location(s) of corresponding protein based on prediction methods for signal peptides and transmembrane regions.
Genes with at least one transcript predicted to encode a secreted protein, according to prediction methods or to UniProt location data, have been further annotated and classified with the aim to determine if the corresponding protein(s) are secreted or actually retained in intracellular locations or membrane-attached.
Remaining genes, with no transcript predicted to encode a secreted protein, will be assigned the prediction-based location(s).
The annotated location overrules the predicted location, so that a gene encoding a predicted secreted protein that has been annotated as intracellular will have intracellular as the final location.
Gene information from Ensembl and Entrez, as well as links to available gene identifiers are displayed here. Information was retrieved from Ensembl if not indicated otherwise.
Chromosome
5
Cytoband
q31.1
Chromosome location (bp)
134601149 - 134649271
Number of transcriptsi
Number of protein-coding transcripts from the gene as defined by Ensembl.
Useful information about the protein provided by UniProt.
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 1,2,3,4. 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 5,6,7. 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 8,9. 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 10....show less
Molecular function (UniProt)i
Keywords assigned by UniProt to proteins due to their particular molecular function.
Hydrolase
Biological process (UniProt)i
Keywords assigned by UniProt to proteins because they are involved in a particular biological process.
ER-Golgi transport, Protein transport, Transport
Ligand (UniProt)i
Keywords assigned by UniProt to proteins because they bind, are associated with, or whose activity is dependent of some molecule.
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]...show less
PROTEIN INFORMATIONi
The protein information section displays alternative protein-coding transcripts (splice variants) encoded by this gene according to the Ensembl database.
The Splice variant identifier links to the Ensembl website protein summary for the selected splice variant. The data in the Swissprot and TrEMBL columns links to corresponding pages in the UniProt database.
The protein classes assigned to this protein are shown if expanding the data in the protein class column. Parent protein classes are in bold font and subclasses are listed under the parent class.
The length of the protein (amino acid residues according to Ensembl), molecular mass (kDalton), predicted signal peptide and number of predicted transmembrane region(s) according to in-house majority decision methods based on sets of predictors are also reported.
Predicted intracellular proteins Intracellular proteins predicted by MDM and MDSEC Plasma proteins Disease related genes Human disease related genes Congenital disorders of metabolism Congenital disorders of lipid/glycolipid metabolism Mapped to neXtProt neXtProt - Evidence at protein level Protein evidence (Kim et al 2014) Protein evidence (Ezkurdia et al 2014)
Predicted intracellular proteins Intracellular proteins predicted by MDM and MDSEC Plasma proteins Disease related genes Human disease related genes Congenital disorders of metabolism Congenital disorders of lipid/glycolipid metabolism Mapped to neXtProt neXtProt - Evidence at protein level Protein evidence (Ezkurdia et al 2014)
Predicted intracellular proteins Intracellular proteins predicted by MDM and MDSEC Human disease related genes Congenital disorders of metabolism Congenital disorders of lipid/glycolipid metabolism Protein evidence (Ezkurdia et al 2014)
Q9H029 [Direct mapping] GTP-binding protein SAR1b; Uncharacterized protein DKFZp434B2017; cDNA FLJ32259 fis, clone PROST1000298, highly similar to GTP-binding protein SAR1b
Show all
Predicted intracellular proteins Intracellular proteins predicted by MDM and MDSEC Human disease related genes Congenital disorders of metabolism Congenital disorders of lipid/glycolipid metabolism Protein evidence (Ezkurdia et al 2014)
Predicted intracellular proteins Intracellular proteins predicted by MDM and MDSEC Human disease related genes Congenital disorders of metabolism Congenital disorders of lipid/glycolipid metabolism Protein evidence (Ezkurdia et al 2014)
Q9H029 [Direct mapping] GTP-binding protein SAR1b; Uncharacterized protein DKFZp434B2017; cDNA FLJ32259 fis, clone PROST1000298, highly similar to GTP-binding protein SAR1b
Show all
Predicted intracellular proteins Intracellular proteins predicted by MDM and MDSEC Human disease related genes Congenital disorders of metabolism Congenital disorders of lipid/glycolipid metabolism Protein evidence (Ezkurdia et al 2014)
Predicted intracellular proteins Intracellular proteins predicted by MDM and MDSEC Human disease related genes Congenital disorders of metabolism Congenital disorders of lipid/glycolipid metabolism Protein evidence (Ezkurdia et al 2014)
Q9H029 [Direct mapping] GTP-binding protein SAR1b; Uncharacterized protein DKFZp434B2017; cDNA FLJ32259 fis, clone PROST1000298, highly similar to GTP-binding protein SAR1b
Show all
Predicted intracellular proteins Intracellular proteins predicted by MDM and MDSEC Human disease related genes Congenital disorders of metabolism Congenital disorders of lipid/glycolipid metabolism Protein evidence (Ezkurdia et al 2014)
The Human Protein Atlas project is funded
