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Product Includes Quantity Applications Reactivity MW(kDa) Isotype
CD2AP Antibody 2135 40 µl
Western Blotting
H M R Mk 80 Rabbit 
Claudin-1 (D5H1D) XP® Rabbit mAb 13255 40 µl
Western Blotting Immunoprecipitation Immunohistochemistry
H Dg 20 Rabbit IgG
ZO-1 (D7D12) Rabbit mAb 8193 40 µl
Western Blotting Immunoprecipitation
H Mk 220 Rabbit IgG
ZO-2 Antibody 2847 40 µl
Western Blotting Immunofluorescence
H M R Mk B Dg 150 Rabbit 
ZO-3 (D57G7) XP® Rabbit mAb 3704 40 µl
Western Blotting Immunofluorescence
H 140 Rabbit IgG
Afadin (D1Y3Z) Rabbit mAb 13531 40 µl
Western Blotting Immunoprecipitation
H M R Mk Dg 205 Rabbit IgG
Anti-rabbit IgG, HRP-linked Antibody 7074 100 µl
Western Blotting
All Goat 

Product Description

The Tight Junction Antibody Sampler Kit provides an economical means to evaluate the presence of a number of proteins involved in tight junctions. The kit contains enough primary antibodies to perform four western blot experiments per primary antibody.

Specificity / Sensitivity

CD2AP Antibody recognizes endogenous levels of total CD2AP protein. Claudin-1 (D5H1D) XP® Rabbit mAb recognizes endogenous levels of total claudin-1 protein. Based on sequence similarity, Claudin-1 (D5H1D) XP® Rabbit mAb may cross-react with claudin-2 protein. ZO-1 (D7D12) Rabbit mAb recognizes endogenous levels of total ZO-1 protein. ZO-2 Antibody recognizes endogenous levels of total ZO-2 protein. ZO-3 (D57G7) XP® Rabbit mAb detects endogenous levels of total ZO-3 protein. Afadin (D1Y3Z) Rabbit mAb recognizes endogenous levels of total afadin protein and based on the protein sequence, this antibody is expected to recognize all afadin isoforms.

Source / Purification

Polyclonal antibodies are produced by immunizing animals with a synthetic peptide corresponding to residues surrounding the carboxy terminus of human γ-catenin protein or the sequence of human catenin δ-1 protein. Polyclonal antibodies are purified by protein A and peptide affinity chromatography. Monoclonal antibody is produced by immunizing animals with a synthetic peptide corresponding to the amino-terminal sequence of human α-E-catenin, the carboxy terminus of human claudin-1 protein, Arg1117 of human afadin protein or to residues surrounding Pro714 of human β-catenin protein.

Tight junctions, or zona occludens, form a continuous barrier to fluids across the epithelium and endothelium. They function in regulation of paracellular permeability and in the maintenance of cell polarity, blocking the movement of transmembrane proteins between the apical and basolateral cell surfaces (reviewed in 1). Tight junctions are composed of claudin and occludin transmembrane proteins, which join the junctions to the cytoskeleton (1,2). The claudin family is composed of 23 integral membrane proteins, and their expression, which varies among tissue types, may determine both the strength and properties of the epithelial barrier (2,3). Zona occludens proteins ZO-1, -2, and -3 (also known as TJP1, 2, and 3) are peripheral membrane adaptor proteins that link junctional transmembrane proteins such as occludin and claudin to the actin cytoskeleton (reviewed in 4). ZO-1 and ZO-2 are required for tight junction formation and function (5,6). In subconfluent proliferating cells, ZO-1 and ZO-2 have been shown to colocalize to the nucleus and play a role in transcriptional regulation (7-9). Exogenous expression of the amino terminal portion of ZO-3 exerts a dominant negative effect that interferes with assembly of tight junctions and adherens junctions (10). ZO-1 has been shown to interact with afadin prior to the formation of tight junctions (11). Recent work has also shown that afadin is involved in controlling the directionality of cell movement when it is localized at the leading edge of moving cells (12,13). CD2AP is a scaffolding protein that is thought to link membrane proteins to the cytoskeleton (14-16). It plays a role in the formation of tight junctions in specialized cell types such as the slit diaphragm of the kidney glomerulus (17). CD2AP is also involved in the immunological synapse between CD2-expressing T cells and antigen presenting cells (18). Research studies have shown that interaction between CD2AP and other cytoskeletal proteins may regulate the endocytosis of EGFR (16).

1.  Shin, K. et al. (2006) Annu Rev Cell Dev Biol 22, 207-35.

2.  Oliveira, S.S. and Morgado-Díaz, J.A. (2007) Cell Mol Life Sci 64, 17-28.

3.  Matter, K. and Balda, M.S. (2007) J Cell Sci 120, 1505-11.

4.  Hewitt, K.J. et al. (2006) BMC Cancer 6, 186.

5.  Hernandez, S. et al. (2007) Exp Cell Res 313, 1533-47.

6.  Umeda, K. et al. (2006) Cell 126, 741-54.

7.  Betanzos, A. et al. (2004) Exp Cell Res 292, 51-66.

8.  Traweger, A. et al. (2003) J Biol Chem 278, 2692-700.

9.  Huerta, M. et al. (2007) Mol Biol Cell 18, 4826-36.

10.  Miyata, M. et al. (2009) J Cell Sci 122, 4319-29.

11.  Miyata, M. et al. (2009) J Biol Chem 284, 24595-609.

12.  Wittchen, E.S. et al. (2000) J Cell Biol 151, 825-36.

13.  Ooshio, T. et al. (2010) J Biol Chem 285, 5003-12.

14.  Kirsch, K.H. et al. (1999) Proc Natl Acad Sci U S A 96, 6211-6.

15.  Kirsch, K.H. et al. (2001) J Biol Chem 276, 4957-63.

16.  Lynch, D.K. et al. (2003) J Biol Chem 278, 21805-13.

17.  Kawachi, H. et al. (2006) Nephrology (Carlton) 11, 274-81.

18.  Hutchings, N.J. et al. (2003) J Biol Chem 278, 22396-403.

Entrez-Gene Id 4301 , 23607 , 9076 , 7082 , 9414 , 27134
Swiss-Prot Acc. P55196 , Q9Y5K6 , O95832 , Q07157 , Q9UDY2 , O95049

For Research Use Only. Not For Use In Diagnostic Procedures.
Cell Signaling Technology is a trademark of Cell Signaling Technology, Inc.