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ZO-2 Polyclonal antibody

ZO-2 Polyclonal Antibody for IF, WB, ELISA

Host / Isotype

Rabbit / IgG


human, mouse, rat and More (1)





Cat no : 18900-1-AP


Tight junction protein 2, Tight junction protein ZO 2, TJP2, X104, ZO 2, ZO2, ZO-2, Zona occludens protein 2, Zonula occludens protein 2

Tested Applications

Positive WB detected inMCF-7 cells, HeLa cells, mouse heart tissue, HEK-293 cells, mouse brain tissue, rat brain tissue, NIH/3T3 cells, C6 cells
Positive IF detected inMCF-7 cells

Recommended dilution

Western Blot (WB)WB : 1:500-1:2000
Immunofluorescence (IF)IF : 1:20-1:200
It is recommended that this reagent should be titrated in each testing system to obtain optimal results.
Sample-dependent, check data in validation data gallery

Product Information

18900-1-AP targets ZO-2 in WB, IP, IHC, IF, ELISA applications and shows reactivity with human, mouse, rat samples.

Tested Reactivity human, mouse, rat
Cited Reactivityhuman, mouse, rat, pig
Host / Isotype Rabbit / IgG
Class Polyclonal
Type Antibody
Immunogen ZO-2 fusion protein Ag13534
Full Name tight junction protein 2 (zona occludens 2)
Calculated molecular weight 134 kDa
Observed molecular weight 150 kDa
GenBank accession numberBC027592
Gene symbol TJP2
Gene ID (NCBI) 9414
Conjugate Unconjugated
Form Liquid
Purification Method Antigen affinity purification
Storage Buffer PBS with 0.02% sodium azide and 50% glycerol pH 7.3.
Storage ConditionsStore at -20°C. Stable for one year after shipment. Aliquoting is unnecessary for -20oC storage. 20ul sizes contain 0.1% BSA.

Background Information

Zona occludens protein 2 (ZO-2), also known as tight junction protein 2 (TJP2), is a membrane-associated guanylate kinase acting at intercellular contacts of epithelial and endothelial cells but also in their nuclei.

What is the molecular weight of ZO-2? Are there any isoforms of ZO-2? Is ZO-2 post-translationally modified?

The molecular weight of ZO-2 is 160 kDa. There are two known isoforms of ZO-2: full-length ZO-2A and ZO-2C lacking the first 23 amino acids (PMID: 10360833). ZO-2 can be phosphorylated and O-glycosylated, which has an impact on its localization (PMID: 23804652).

What is the subcellular localization of ZO-2?

ZO-2 is present at the cytoplasmic face at cell-cell contact sites: tight junctions, adherens junctions, and gap junctions (PMID: 20224657). ZO-2 contains nuclear localization and nuclear export signals and can actively shuttle between the cytoplasm and nucleus (PMID: 11855865). In the nucleus it can affect the activity of various transcription factors. ZO-2 nuclear localization is most prominent in sparse 2D cell cultures and also in cells subjected to mechanical or chemical stress.

What is the tissue expression pattern of ZO-2?

ZO-2 is expressed in various tissues in epithelial and endothelial cells. ZO-2 isoforms have tissue specificity, with ZO-2A being abundant in the heart and brain, while ZO-2C is found in the kidney, pancreas, heart, and placenta (PMID: 11018256).

What proteins can be used as markers of tight junctions?

Zona occludens proteins are often used as tight junction markers. Apart from the antibody against ZO-2, one can use antibodies against ZO-1 (https://www.ptglab.com/products/ZO1-Antibody-21773-1-AP.htm), occludin (https://www.ptglab.com/products/OCLN-Antibody-13409-1-AP.htm), and claudins (e.g., claudin 1: https://www.ptglab.com/products/CLDN1-Antibody-13050-1-AP.htm).


Product Specific Protocols
WB protocol for ZO-2 antibody 18900-1-APDownload protocol
IF protocol for ZO-2 antibody 18900-1-APDownload protocol
Standard Protocols
Click here to view our Standard Protocols



EMBO Mol Med

Deficiency in intestinal epithelial O-GlcNAcylation predisposes to gut inflammation.

Authors - Ming Zhao

Cell Rep

p120 RasGAP and ZO-2 are essential for Hippo signaling and tumor-suppressor function mediated by p190A RhoGAP

Authors - Hanyue Ouyang
  • KD Validated

Biomater Sci

Improved epithelial cell-cell adhesion using molecular mobility of supramolecular surfaces.

Authors - Ryo Mikami

Free Radic Biol Med

Prenylated xanthones from mangosteen (Garcinia mangostana) activate the AhR and Nrf2 pathways and protect intestinal barrier integrity in HT-29 cells.

Authors - Restituto Tocmo

J Agric Food Chem

Gut Microbiota from Short-Chain Chlorinated Paraffin-Exposed Mice Promotes Astrocyte Activation by Disrupting the Intestinal Tight Junction via Zonulin Upregulation

Authors - Xinyuan Zhao

J Cereb Blood Flow Metab

NLRP3 deficiency ameliorates neurovascular damage in experimental ischemic stroke.

Authors - Fan Yang