Download MendeleyStructural insights into mouse anti-apoptotic Bcl-xl reveal affinity for Beclin 1 and gossypol.
Priyadarshi, A., Roy, A., Kim, K.S., Kim, E.E., Hwang, K.Y.(2010) Biochem Biophys Res Commun 394: 515-521
- PubMed: 20206602
- DOI: https://doi.org/10.1016/j.bbrc.2010.03.002
- Primary Citation of Related Structures:
3IHC, 3IHD, 3IHE, 3IHF, 3IIG, 3IIH, 3ILB, 3ILC - PubMed Abstract:
This study reports the crystal structures of Bcl-xl wild type and three Bcl-xl mutants (Y101A, F105A, and R139A) with amino acid substitutions in the hydrophobic groove of the Bcl-xl BH3 domain. An additional 12 ordered residues were observed in a highly flexible loop between the alpha1 and alpha2 helices, and were recognized as an important deamidation site for the regulation of apoptosis. The autophagy-effector protein, Beclin 1, contains a novel BH3 domain (residues 101-125), which binds to the surface cleft of Bcl-xl, as confirmed by nuclear magnetic resonance (NMR) spectroscopy and analytical gel-filtration results. Gossypol, a potent inhibitor of Bcl-xl, had a K(d) value of 0.9 microM. In addition, the structural and biochemical analysis of five Bcl-xl substitution mutants will provide structural insights into the design and development of anti-cancer drugs.
Organizational Affiliation:
Biomedical Research Center, KIST, Republic of Korea.
