Bim BH3, Peptide IV is a 26-residue peptide from BH3-only protein Bim, which belongs to the pro-apoptotic group of the Bcl-2 family of proteins[1][2].
[1]. Zhu Y, et al. Constitutive association of the proapoptotic protein Bim with Bcl-2-related proteins on mitochondriain T cells. Proc Natl Acad Sci U S A. 2004 May 18;101(20):7681-6. [2]. Lee EF, et al. High-resolution structural characterization of a helical alpha/beta-peptide foldamer bound to the anti-apoptotic protein Bcl-xL. Angew Chem Int Ed Engl. 2009;48(24):4318-22.