Anti-apoptotic Bcl-2 family protein

"Antiapoptotic activity" is not a single molecule or receptor but rather a **functional property** shared by several related proteins. The most prominent group responsible for this activity is the **anti-apoptotic subfamily of the Bcl‑2 family**, which includes **Bcl‑2**, **Bcl-xL**, **Mcl‑1**, **Bfl‑1/A1**, and **Bcl-w**. These mitochondrial membrane-associated proteins prevent programmed cell death by inhibiting pro-apoptotic factors and blocking mitochondrial outer membrane permeabilization—a key step in apoptosis initiation. Overexpression of these molecules is common in many cancers and contributes to tumor development, progression, and resistance to chemotherapy. As such, they are considered important therapeutic targets; several small-molecule inhibitors ("BH3 mimetics") have been developed that specifically antagonize their function to restore apoptotic sensitivity in cancer cells[3][4][5][6][7]. However, "antiapoptotic activity" itself does not refer to a unique gene product or molecular entity but rather describes a class effect mediated by multiple related molecules. --- **Key note:** There is something incorrect about using "Antiapoptotic activity" as a target name—it refers broadly to an effect or function rather than any one canonical molecule/receptor/protein. For structured data purposes you should map this entry instead to its most relevant molecular representatives—most commonly "Anti-apoptotic Bcl‑2 family protein", with further specification if possible based on context (e.g., "Myeloid cell leukemia 1", "B-cell lymphoma 2"). If you need information about other families with similar functions—such as Inhibitor of Apoptosis Proteins (IAPs)—they should be listed separately[4].

Other names

Antiapoptotic proteinBcl-2 family anti-apoptotic proteinBCL-2BCL-xLMCL1BCL-wA1/BFL-1

BH3 mimetics disrupt binding between anti-apoptotic and pro-apoptotic proteins to induce apoptosis[7].