Anti-SSR1 antibody produced in rabbit

enhanced validation

Prestige Antibodies® Powered by Atlas Antibodies, affinity isolated antibody, buffered aqueous glycerol solution

Anti-SSR-alpha, Anti-Translocon-associated protein subunit alpha precursor, Anti-Signal sequence receptor subunit alpha, Anti-TRAP-alpha
Human Protein Atlas Number:

biological source


Quality Level

antibody form

affinity isolated antibody

antibody product type

primary antibodies



product line

Prestige Antibodies® Powered by Atlas Antibodies


buffered aqueous glycerol solution

species reactivity

mouse, human, rat


antibody small pack of 25 μL

enhanced validation

Learn more about Antibody Enhanced Validation


immunoblotting: 0.04-0.4 μg/mL
immunofluorescence: 0.25-2 μg/mL
immunohistochemistry: 1:500-1:1000

immunogen sequence




UniProt accession no.

shipped in

wet ice

storage temp.


Gene Information

human ... SSR1(6745)

General description

SSR1 (signal sequence receptor, α) is an endoplasmic reticulum (ER) membrane protein, which is predominantly localized to rough ER. Its molecular weight is 34kDa. It is a type I membrane protein and is also found in the nuclear envelope. This gene is localized to human chromosome 6. It is also known as translocon-associated protein α (TRAPA) and is one of the four subunits making the TRAP complex.


Translocon-associated protein subunit alpha precursor recombinant protein epitope signature tag (PrEST)


Anti-SSR1 antibody produced in rabbit, a Prestige Antibody, is developed and validated by the Human Protein Atlas (HPA) project (www.proteinatlas.org). Each antibody is tested by immunohistochemistry against hundreds of normal and disease tissues. These images can be viewed on the Human Protein Atlas (HPA) site by clicking on the Image Gallery link. The antibodies are also tested using immunofluorescence and western blotting. To view these protocols and other useful information about Prestige Antibodies and the HPA, visit sigma.com/prestige.
Anti-SSR1 antibody produced in rabbit has been used in selective permeabilization immunofluorescence (2μg/ml).

Biochem/physiol Actions

The function of SSR1 (signal sequence receptor, α) is not yet fully characterized. It is a calcium binding protein. It forms part of the translocon-associated protein (TRAP) complex, which is involved in the endoplasmic reticulum-associated degradation (ERAD) pathway. This protein is induced by granulocyte-macrophage colony-stimulating factor (GM-CSF), which might be an outcome of unfolded protein response due to the accumulation of improperly folded proteins. Also this gene is located in the schizophrenia susceptibility locus.

Features and Benefits

Prestige Antibodies® are highly characterized and extensively validated antibodies with the added benefit of all available characterization data for each target being accessible via the Human Protein Atlas portal linked just below the product name at the top of this page. The uniqueness and low cross-reactivity of the Prestige Antibodies® to other proteins are due to a thorough selection of antigen regions, affinity purification, and stringent selection. Prestige antigen controls are available for every corresponding Prestige Antibody and can be found in the linkage section.

Every Prestige Antibody is tested in the following ways:
  • IHC tissue array of 44 normal human tissues and 20 of the most common cancer type tissues.
  • Protein array of 364 human recombinant protein fragments.


Corresponding Antigen APREST71885.

Physical form

Solution in phosphate-buffered saline, pH 7.2, containing 40% glycerol and 0.02% sodium azide

Legal Information

Prestige Antibodies is a registered trademark of Sigma-Aldrich Co. LLC


Unless otherwise stated in our catalog or other company documentation accompanying the product(s), our products are intended for research use only and are not to be used for any other purpose, which includes but is not limited to, unauthorized commercial uses, in vitro diagnostic uses, ex vivo or in vivo therapeutic uses or any type of consumption or application to humans or animals.


12 - Non Combustible Liquids

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves

Certificate of Analysis

Certificate of Origin

T Hirama et al.
FEBS letters, 455(3), 223-227 (1999-08-07)
The cloning of full length cDNA for the translocon-associated protein alpha subunit, previously called signal sequence receptor alpha, is reported as a result of differential display experiments in search of genes induced by granulocyte-macrophage colony-stimulating factor. Its messenger RNA was...
Koji Nagasawa et al.
EMBO reports, 8(5), 483-489 (2007-03-24)
The mammalian translocon-associated protein (TRAP) complex comprises four transmembrane protein subunits in the endoplasmic reticulum. The complex associates with the Sec61 translocon, although its function in vivo remains unknown. Here, we show the involvement of the TRAP complex in endoplasmic...
Martin S Taylor et al.
The Journal of biological chemistry, 288(45), 32211-32228 (2013-09-21)
Ghrelin O-acyltransferase (GOAT) is a polytopic integral membrane protein required for activation of ghrelin, a secreted metabolism-regulating peptide hormone. Although GOAT is a potential therapeutic target for the treatment of obesity and diabetes and plays a key role in other...
F Vogel et al.
European journal of cell biology, 53(2), 197-202 (1990-12-01)
The signal sequence receptor (SSR), an integral membrane glycoprotein of 34 kDa, has previously been shown to be a component of the molecular environment which nascent polypeptide chains meet in passage through the endoplasmic reticulum (ER) membrane. We have used...
E Hartmann et al.
FEBS letters, 349(3), 324-326 (1994-08-08)
The alpha-subunit of the TRAP complex (TRAP alpha) is a single-spanning membrane protein of the endoplasmic reticulum (ER) which is found in proximity of nascent polypeptide chains translocating across the membrane. Here, we demonstrate the widespread occurrence of TRAP alpha...

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