Overexpression of Bax accelerates apoptotic death induced by cytokine deprivation in an IL-3-dependent cell line, and Bax also counters the death repressor activity of Bcl-2. Bcl-x, one of several additional proteins with sequence homology to Bcl-2, is expressed as Bcl-xL, a 233 amino acid protein with 43% sequence identity with Bcl-2 that suppresses cell death, and Bcl-xS, a shorter variant that is 178 amino acids in length and lacks a 63 amino acid region (amino acids 126-188) found in Bcl-xL and which functions as a dominant inhibitor of Bcl-2. A further apoptosis-inducing protein, Bad, dimerizes both with Bcl-xL and to a lesser extent with Bcl-2, thus displacing Bax and inducing apoptosis.
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Protein Aliases: anti-apoptosis regulatory protein; Apoptosis regulator Bcl-X; B cell lymphoma 2 like; B cell lymphoma like X; B-cell leukemia/lymphoma x; Bcl-2-like protein 1; Bcl-xL; Bcl-XS; Bcl2-L-1; BCL2-like 1; BCL2L; BCL2L1; BCLX; BclxL; BclXS; protein phosphatase 1, regulatory subunit 52
Gene Aliases: Bcl(X)L; Bcl-X; Bcl-XL; BCL-XL/S; bcl2-L-1; BCL2L; BCL2L1; BCLX; Blc2l; PPP1R52
Molecular Function: signaling molecule