6X7I image
Entry Detail
PDB ID:
6X7I
Title:
Structure of the C-terminal domain of BCL-XL in membrane
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2020-05-30
Release Date:
2020-07-01
Method Details:
Experimental Method:
Conformers Calculated:
100
Conformers Submitted:
10
Selection Criteria:
structures with the lowest energy
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Bcl-2-like protein 1
Chain IDs:A
Chain Length:28
Number of Molecules:1
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Conformational States of the Cytoprotective Protein Bcl-xL.
Biophys.J. 119 1324 1334 (2020)
PMID: 32888404 DOI: 10.1016/j.bpj.2020.08.014

Abstact

Bcl-xL is a major inhibitor of apoptosis, a fundamental homeostatic process of programmed cell death that is highly conserved across evolution. Because it plays prominent roles in cancer, Bcl-xL is a major target for anticancer therapy and for studies aimed at understanding its structure and activity. Although Bcl-xL is active primarily at intracellular membranes, most studies have focused on soluble forms of the protein lacking both the membrane-anchoring C-terminal tail and the intrinsically disordered loop, and this has resulted in a fragmented view of the protein's biological activity. Here, we describe the conformation of full-length Bcl-xL. Using NMR spectroscopy, molecular dynamics simulations, and isothermal titration calorimetry, we show how the three structural elements affect the protein's structure, dynamics, and ligand-binding activity in both its soluble and membrane-anchored states. The combined data provide information about the molecular basis for the protein's functionality and a view of its complex molecular mechanisms.

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