Molecular weight (DA)
22kD
Immunogen
The antiserum was produced against synthesized peptide derived from human SAR1B. AA range:111-160
Specificity
Sar1B Polyclonal Antibody detects endogenous levels of Sar1B protein.
Formulation
Liquid in PBS containing 50% glycerol, 0.5% BSA and 0.02% sodium azide.
Dilution rate
WB: 1/500 - 1/2000. IHC: 1/100 - 1/300. ELISA: 1/20000.. IF 1:50-200
Purification process (Immunogen)
The antibody was affinity-purified from rabbit antiserum by affinity-chromatography using epitope-specific immunogen.
Background
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],
Function
disease:Defects in SAR1B are the cause of chylomicron retention disease (CMRD) [MIM:246700]; also known as Anderson disease (ANDD). CMRD is 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.,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.,similarity:Belongs to the small GTPase superfamily.,similarity:Belongs to the small GTPase superfamily. SAR1 family
Protein name
GTP-binding protein SAR1b
Other name
SAR1B; SARA2; SARB; GTP-binding protein SAR1b; GTP-binding protein B; GTBPB
Fields
>>Protein processing in endoplasmic reticulum;>>Legionellosis
Human protein sequence Database
Q9Y6B6
Mouse protein sequence database
Q9CQC9
Rat protein sequence database
Q5HZY2
Cellular localization
Endoplasmic reticulum membrane ; Peripheral membrane protein . Golgi apparatus, Golgi stack membrane ; Peripheral membrane protein . Associated with the endoplasmic reticulum and Golgi stacks, in particular in the juxta-nuclear Golgi region. .
Tissue expression
Expressed in many tissues including small intestine, liver, muscle and brain.
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