Catalog # TX2885

Themis (N-terminal region) Peptide

Blocking Peptide

Application / Dilution

Blocking	1:1000
ELISA	50 ng/well

Size 50 μg

During positive selection, thymocytes transition through a stage during which T cell antigen receptor (TCR) signaling controls CD4-versus-CD8 lineage selection and maturation. Thymocyte-expressed molecule involved in selection (themis) is critically required for this thymocyte selection. Themis has been identified as several molecules: Grb2-associating protein (GASP), signaling phosphoprotein specific for T cells (SPoT), TSEPA, and thylex. Themis is a cytosolic protein with no known functional motifs. Its expression is observed primarily in T cells, especially immature CD4/CD8 double positive thymocytes. Themis-deficient thymocytes have defective positive selection, and fewer numbers of mature thymocytes. These themis-induced effects may be due to defective TCR signaling since themis constitutively associates with the TCR adaptor Grb2, and themis is phosphorylated quickly after TCR stimulation. In addition, themis is required for optimal TCR-driven calcium mobilization and activation of the MAP kinase Erk. Thus, themis may be an important adaptor protein in TCR signaling.

References

Fu, G., et al. (2009) Nat Immunol. 10(8):848.
Johnson, A.L., et al. (2009) Nat Immunol. 10(8):831.
Kakugawa, K., et al. (2009) Mol Cell Biol. 29(18):5128.
Lesourne, R., et al. (2009) Nat Immunol. 10(8):840.
Patrick M.S., et al. (2009) Proc Natl Acad Sci U S A. 106(38):16345.

Western blot of mouse spleen (lanes 1-4) and human K562 cells (lanes 5-8). The blots were probed with anti-themis (N-terminal region) rabbit polyclonal antibody at 1:2000 (lanes 1 & 5), 1:1000 (lanes 2 & 6), 1:500 (lanes 3 & 7), or 1:500 in the presence of themis blocking peptide (TX3885) (lanes 4 & 8).

Themis (N-terminal region) peptide corresponds to amino acids in the N-terminal region of human themis. This sequence has high homology to the conserved region in rat and mouse themis.

*For more information, see UniProt Accession Q8N1K5

Blocking Peptide is supplied in 50µl phosphate-buffered saline and 0.05% sodium azide. Store at –20°C. Stable for 1 year.

The products are are safely shipped at ambient temperature for both domestic and international shipments. Each product is guaranteed to match the specifications as indicated on the corresponding technical data sheet. Please store at -20C upon arrival for long term storage.

The peptide is specifically recognized by themis (N-terminal region) antibody (TP3881) in ELISA, and has been shown to block the reactivity of TP3881 in Western blot. In addition, the peptide is recommended for use in blocking TP3881 reactivity in immunocytochemistry.

*All molecular weights (MW) are confirmed by comparison to Bio-Rad Rainbow Markers and to western blot mobilities of known proteins with similar MW.

This kit contains: