3DVU

Crystal structure of the complex of murine gamma-herpesvirus 68 Bcl-2 homolog M11 and the Beclin 1 BH3 domain

3DVU の概要

• エントリーDOI: 10.2210/pdb3dvu/pdb
• 関連するPDBエントリー: 3BL2
• 分子名称: V-bcl-2, Beclin-1 (3 entities in total)
• 機能のキーワード: autophagy, protein-protein complex, viral bcl-2, beclin 1, apoptosis, m11, antiviral defense, bh3 domain, coiled coil, cytoplasm, golgi apparatus, membrane, polymorphism, viral protein-apoptosis complex, viral protein/apoptosis
• 由来する生物種: Murid herpesvirus 4 (MuHV-4); 詳細
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 38996.15

構造登録者

Sinha, S. (登録日: 2008-07-20, 公開日: 2008-10-07, 最終更新日: 2023-11-01)

主引用文献

Sinha, S.,Colbert, C.L.,Becker, N.,Wei, Y.,Levine, B.
Molecular basis of the regulation of Beclin 1-dependent autophagy by the gamma-herpesvirus 68 Bcl-2 homolog M11.
Autophagy, 4:989-997, 2008

PubMed Abstract: Gamma-herpesviruses (gammaHVs), including important human pathogens such as Epstein Barr virus, Kaposi's sarcoma-associated HV, and the murine gammaHV68, encode homologs of the antiapoptotic, cellular Bcl-2 (cBcl-2) to promote viral replication and pathogenesis. The precise molecular details by which these proteins function in viral infection are poorly understood. Autophagy, a lysosomal degradation pathway, is inhibited by the interaction of cBcl-2s with a key autophagy effector, Beclin 1, and can also be inhibited by gammaHV Bcl-2s. Here we investigate the gammaHV68 M11-Beclin 1 interaction in atomic detail, using biochemical and structural approaches. We show that the Beclin 1 BH3 domain is the primary determinant of binding to M11 and other Bcl-2s, and this domain binds in a hydrophobic groove on M11, reminiscent of the binding of different BH3 domains to other Bcl-2s. Unexpectedly, regions outside of, but contiguous with, the Beclin 1 BH3 domain also contribute to this interaction. We find that M11 binds to Beclin 1 more strongly than do KSHV Bcl-2 or cBcl-2. Further, the differential affinity of M11 for different BH3 domains is caused by subtle, yet significant, variations in the atomic details of each interaction. Consistent with our structural analysis, we find that Beclin 1 residues L116 and F123, and M11 residue pairs G86 + R87 and Y60 + L74, are required for M11 to bind to Beclin 1 and downregulate autophagy. Thus, our results suggest that M11 inhibits autophagy through a mechanism that involves the binding of the Beclin 1 BH3 domain in the M11 hydrophobic surface groove.

PubMed: 18797192
DOI: 10.4161/auto.6803

実験手法

X-RAY DIFFRACTION (2.5 Å)