|Detection of Human CIS-1 by Western Blot. Western blot shows lysates of Nalm‑6 human Pre‑B acute lymphocytic leukemia cell line. PVDF membrane was probed with 1 µg/mL of Goat Anti-Human CIS-1 Antigen Affinity-purified Polyclonal Antibody (Catalog # AF3194) followed by HRP-conjugated Anti-Goat IgG Secondary Antibody (Catalog # HAF019). A specific band was detected for CIS-1 at approximately 35‑40 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 8.|
Cytokine Inducible SH2-containing protein (CIS-1) is a 29 kDa protein found in a variety of cell types. Mono or polyubiquitination generally results in a 37 or 45 kDa molecule. CIS-1 binds to phosphorylated cytokine receptors IL-3 R beta and EPO-R and blocks downstream activation of STAT5 via receptor internalization and ubiquitin‑mediated proteosomal degradation. Human CIS-1 is a 258 aa peptide that contains one SH2 domain (aa 82‑163) and one SOCS box (aa 218‑258). There are two known alternatively spliced variants with a 7- or 13-aa substitution for the 7 N-terminal amino acid residues. Over the region used as immunogen, human CIS-1 is 91% identical to the corresponding mouse and canine protein sequences.
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