|Detection of Human and Mouse MYB by Western Blot. Western blot shows lysates of CH‑1 mouse B cell lymphoma cell line, Jurkat human acute T cell leukemia cell line, MOLT‑4 human acute lymphoblastic leukemia cell line. PVDF Membrane was probed with 1 µg/mL of Sheep Anti-Human/Mouse MYB Antigen Affinity-purified Polyclonal Antibody (Catalog # AF6209) followed by HRP-conjugated Anti-Sheep IgG Secondary Antibody (Catalog # HAF016). A specific band was detected for MYB at approximately 80 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 2.|
MYB (myeloblastosis protooncogene) is an 80 kDa transcriptional activator. It is found in hematopoietic and intestinal crypt epithelial cells. MYB interacts with p300 and activates multiple genes, including Bcl2, GATA3, and MYC. Although MYB is thought of as a pro-proliferation and antidifferentiation factor, it would now appear that MYB contributes to both T- and B-cell maturation and to cell survival in general. Human MYB is 640 amino acids (aa) in length. It contains three DNA binding, HTH‑myb type domains (aa 35‑193), one transcriptional activation segment (aa 275‑327), and a Leu‑zipper motif (aa 376‑397). There are multiple potential splice forms. One shows an alternate start site at Met189 coupled with a 99 aa substitution for aa 567‑640. Another shows a 121 aa insertion after Ser401. Four show C‑terminal substitutions: a 34 aa substitution for aa 314‑640, a Met substitution for aa 402‑640, a seven aa substitution for aa 317‑640, and a 10 aa substitution for aa 603‑640. Over aa 503‑640, human MYB shares 84% aa identity with mouse MYB.
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