The protein encoded the BCL-X gene belongs to the BCL-2 protein family. BCL-2 family members form hetero- or homodimers and act as anti- or pro-apoptotic regulators that are involved in a wide variety of cellular activities. The proteins encoded by this gene are located at the outer mitochondrial membrane, and have been shown to regulate outer mitochondrial membrane channel (VDAC) opening. VDAC regulates mitochondrial membrane potential, and thus controls the production of reactive oxygen species and release of cytochrome C by mitochondria, both of which are the potent inducers of cell apoptosis. Alternative splicing results in multiple transcript variants encoding two different isoforms. The longer isoform acts as an apoptotic inhibitor and the shorter isoform acts as an apoptotic activator.
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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