Crystal structure of Bcl-2 in complex with the novel orally active inhibitor S55746

Experimental Data Snapshot

  • Resolution: 1.40 Å
  • R-Value Free: 0.194 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.179 

Starting Model: experimental
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S55746 is a novel orally active BCL-2 selective and potent inhibitor that impairs hematological tumor growth.

Casara, P.Davidson, J.Claperon, A.Le Toumelin-Braizat, G.Vogler, M.Bruno, A.Chanrion, M.Lysiak-Auvity, G.Le Diguarher, T.Starck, J.B.Chen, I.Whitehead, N.Graham, C.Matassova, N.Dokurno, P.Pedder, C.Wang, Y.Qiu, S.Girard, A.M.Schneider, E.Grave, F.Studeny, A.Guasconi, G.Rocchetti, F.Maiga, S.Henlin, J.M.Colland, F.Kraus-Berthier, L.Le Gouill, S.Dyer, M.J.S.Hubbard, R.Wood, M.Amiot, M.Cohen, G.M.Hickman, J.A.Morris, E.Murray, J.Geneste, O.

(2018) Oncotarget 9: 20075-20088

  • DOI: https://doi.org/10.18632/oncotarget.24744
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Escape from apoptosis is one of the major hallmarks of cancer cells. The B-cell Lymphoma 2 (BCL-2) gene family encodes pro-apoptotic and anti-apoptotic proteins that are key regulators of the apoptotic process. Overexpression of the pro-survival member BCL-2 is a well-established mechanism contributing to oncogenesis and chemoresistance in several cancers, including lymphoma and leukemia. Thus, BCL-2 has become an attractive target for therapeutic strategy in cancer, as demonstrated by the recent approval of ABT-199 (Venclexta™) in relapsed or refractory Chronic Lymphocytic Leukemia with 17p deletion. Here, we describe a novel orally bioavailable BCL-2 selective and potent inhibitor called S55746 (also known as BCL201). S55746 occupies the hydrophobic groove of BCL-2. Its selectivity profile demonstrates no significant binding to MCL-1, BFL-1 (BCL2A1/A1) and poor affinity for BCL-XL. Accordingly, S55746 has no cytotoxic activity on BCL-XL-dependent cells, such as platelets. In a panel of hematological cell lines, S55746 induces hallmarks of apoptosis including externalization of phosphatidylserine, caspase-3 activation and PARP cleavage. Ex vivo , S55746 induces apoptosis in the low nanomolar range in primary Chronic Lymphocytic Leukemia and Mantle Cell Lymphoma patient samples. Finally, S55746 administered by oral route daily in mice demonstrated robust anti-tumor efficacy in two hematological xenograft models with no weight lost and no change in behavior. Taken together, these data demonstrate that S55746 is a novel, well-tolerated BH3-mimetic targeting selectively and potently the BCL-2 protein.

  • Organizational Affiliation

    Institut de Recherches Servier Discovery Chemistry Unit, Croissy Sur Seine, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Apoptosis regulator Bcl-2,Apoptosis regulator Bcl-2,Apoptosis regulator Bcl-2,Bcl-2-like protein 1,Apoptosis regulator Bcl-2,Apoptosis regulator Bcl-2,Apoptosis regulator Bcl-2172Homo sapiensMutation(s): 2 
UniProt & NIH Common Fund Data Resources
Find proteins for Q07817 (Homo sapiens)
Explore Q07817 
Go to UniProtKB:  Q07817
GTEx:  ENSG00000171552 
Find proteins for P10415 (Homo sapiens)
Explore P10415 
Go to UniProtKB:  P10415
GTEx:  ENSG00000171791 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsQ07817P10415
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on F3Q

Download Ideal Coordinates CCD File 
B [auth A]~{N}-(4-hydroxyphenyl)-3-[6-[[(3~{S})-3-(morpholin-4-ylmethyl)-3,4-dihydro-1~{H}-isoquinolin-2-yl]carbonyl]-1,3-benzodioxol-5-yl]-~{N}-phenyl-5,6,7,8-tetrahydroindolizine-1-carboxamide
C43 H42 N4 O6
Experimental Data & Validation

Experimental Data

  • Resolution: 1.40 Å
  • R-Value Free: 0.194 
  • R-Value Work: 0.178 
  • R-Value Observed: 0.179 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 35.09α = 90
b = 46.9β = 90
c = 85.04γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2018-11-07
    Type: Initial release
  • Version 1.1: 2018-11-14
    Changes: Data collection, Database references
  • Version 1.2: 2024-01-17
    Changes: Data collection, Database references, Refinement description