Anti-GUCA2A antibody produced in rabbit

enhanced validation

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

Anti-Gap-I, Anti-Guanylin precursor, Anti-Guanylate cyclase-activating protein 1, Anti-Guanylate cyclase activator 2A
Human Protein Atlas Number:
Pricing and availability is not currently available.

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



antibody small pack of 25 μL

enhanced validation

orthogonal RNAseq
recombinant expression
Learn more about Antibody Enhanced Validation


immunohistochemistry: 1:1000-1:2500
western blot: 0.04-0.4 μg/mL

immunogen sequence




UniProt accession no.

shipped in

wet ice

storage temp.


Gene Information

human ... GUCA2A(2980)

General description

The gene guanylate cyclase activator 2A (GUCA2A) is mapped to human chromosome 1p35-p34. GUCA2A mRNA is mainly detected in the gastrointestinal tract and kidney.


Guanylin precursor recombinant protein epitope signature tag (PrEST)

Biochem/physiol Actions

Guanylate cyclase activator 2A (GUCA2A) is mainly an intestinal peptide hormone and endogenous ligand of guanylyl cyclase C. It is produced as prohormone proguanylin. In the intestine, GUCA2A along with guanylate cyclase C receptor activates epithelial cells. Activation of this pathway results in secretion of Cl- and HCO3- and inhibition of Na+ absorption, which drives water secretion into the intestinal lumen. In the renal tissue GUCA2A elicits natriuresis, kaliuresis, and diuresis, along with increasing urinary cyclic guanosine monophosphate (cGMP) levels. GUCA2A is suggested to elevate the exrection of urinary salt and water, which results in the prevention of hypernatremia and hypervolemia following increased salt uptake by the body. The protein is also expressed in epithelial cells of the ductal system of human parotid and submandibular glands. It is released into the saliva through salivary duct cells. GUCA2A is highly expressed in salivary gland tumors. On the other hand, GUCA2A is down-regulated in colorectal cancer.

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 APREST72418.

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.

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves


NONH for all modes of transport

WGK Germany


Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis
Certificate of Origin
Amanda M Pattison et al.
Cancer biology & therapy, 21(9), 799-805 (2020-07-01)
Most sporadic colorectal cancer reflects acquired mutations in the adenomatous polyposis coli (APC) tumor suppressor gene, while germline heterozygosity for mutant APC produces the autosomal dominant disorder Familial Adenomatous Polyposis (FAP) with a predisposition to colorectal cancer. In these syndromes...
Thomas Mueller et al.
Kidney international, 82(12), 1253-1255 (2012-12-04)
According to a proposed concept of a gastrointestinal-renal natriuretic signaling axis, natriuretic peptides are released from the intestine into the circulation in response to oral salt intake and act on the kidneys as hormones to increase sodium excretion. The peptides...
Thomas Lauber et al.
Biochemistry, 41(49), 14602-14612 (2002-12-05)
Guanylin, an intestinal peptide hormone and endogenous ligand of guanylyl cyclase C, is produced as the corresponding prohormone proguanylin. The mature hormone consists of 15 amino acid residues, representing the COOH-terminal part of the prohormone comprised of 94 amino acid...
Øystein Brenna et al.
Cell and tissue research, 365(2), 331-341 (2016-04-06)
Guanylin (GUCA2A/Guca2a/GN) and uroguanylin (GUCA2B/Guca2b/UGN) are expressed in the gastrointestinal tract and have been implicated in ion and fluid homeostasis, satiety, abdominal pain, growth and intestinal barrier integrity. Their cellular sources are debated and include goblet cells, entero-/colonocytes, enteroendocrine (EE)...
Hasan Kulaksiz et al.
The American journal of pathology, 161(2), 655-664 (2002-08-07)
Cystic fibrosis transmembrane conductance regulator (CFTR)-mediated secretion of an electrolyte-rich fluid is a major but incompletely understood function of the salivary glands. We provide molecular evidence that guanylin, a bioactive intestinal peptide involved in the CFTR-regulated secretion of electrolyte/water in...

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