CrkL (Tyr-207), phospho-specific polyclonal, anti-human, mouse, rat, chicken, fish

Background:
The Crk family of adaptor proteins (Crk I, Crk II and CrkL) are Src Homology 2 (SH2) and Src Homology 3 (SH3) domain-containing proteins that form protein complexes important for transmiting signals downstream of tyrosine kinases. Both Crk II and CrkL are composed of a single SH2 domain, followed by two tandem SH3 domains. Crk II is also alternatively spliced to a minor product, Crk I, which is structurally and functionally more similar to the v-Crk oncogene. Both Crk II and CrkL are ubiquitously expressed and their SH domains are highly homologous, however both are required for mouse development and have distinct non-overlapping phenotypes in knockout mice. Phosphorylation may be important for regulating Crk activity. Crk II Tyr-221 (CrkL Tyr-207) phosphorylation is a negative regulatory site, while Crk Tyr-251 phosphorylation in the SH3 domain is a positive regulatory site. EGF stimulation induces phosphorylation of Tyr-251, which increases binding of Crk to the SH2 domain of Abl, and promotes transactivation of Abl.

Immunogen: Phospho-Crk (Tyr-207) synthetic peptide (coupled to KLH) corresponding to amino acid residues surrounding Tyr-207 in human CrkL. This peptide sequence is well conserved in mouse and rat CrkL, and has 40% homology with the conserved site in Crk II (Tyr-221). The site is not found in Crk I.

Specificity: This antibody was affinity purified using phospho-CrkL (Tyr-207) peptide (without carrier). The antibody detects a 38 kDa* protein corresponding to the molecular mass of CrkL on SDS-PAGE immunoblots of human K562 cells stimulated with pervanadate. This reactivity is not observed after akaline phosphatase treatment.

Buffer/Storage:
Rabbit polyclonal, affinity-purified antibody is supplied in 100μl phosphate-buffered saline, 50% glycerol, 1 mg/ml BSA, and 0.05% sodium azide. Store at –20°C. Stable for 1 year.