Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly 2  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 27.80 kDa 
• Atom Count: 1854 
• Modelled Residue Count: 185 
• Deposited Residue Count: 230 
• Unique protein chains: 1

4LGE

Crystal structure of clAP1 BIR3 bound to T3261256

• PDB DOI: 10.2210/pdb4LGE/pdb

• Classification: Ligase/Ligase inhibitor
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2013-06-27 Released: 2013-08-28 
• Deposition Author(s): Dougan, D.R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.55 Å
• R-Value Free: 0.182 
• R-Value Work: 0.163 
• R-Value Observed: 0.164 

Literature

Design, stereoselective synthesis, and biological evaluation of novel tri-cyclic compounds as inhibitor of apoptosis proteins (IAP) antagonists.

Asano, M., Hashimoto, K., Saito, B., Shiokawa, Z., Sumi, H., Yabuki, M., Yoshimatsu, M., Aoyama, K., Hamada, T., Morishita, N., Dougan, D.R., Mol, C.D., Yoshida, S., Ishikawa, T.

(2013) Bioorg Med Chem 21: 5725-5737

• PubMed: 23928071 
• DOI: 10.1016/j.bmc.2013.07.020
• Primary Citation of Related Structures:  
  4LGE, 4LGU


• PubMed Abstract: 
  

We recently reported the discovery of octahydropyrrolo[1,2-a]pyrazine A as a lead compound for an inhibitor of apoptosis proteins (IAP) antagonist. To develop IAP antagonists with favorable PK profiles, we designed novel tri-cyclic compounds, octahydro-1H-cyclopropa[4,5]pyrrolo[1,2-a]pyrazines 1 and 2 based on co-crystal structural analysis of A with cellular IAP-1 (cIAP-1). The additional cyclopropane moiety was used to block the predicted metabolic site of compound A without detriment to the binding affinity for cIAP. Compounds 1 and 2 were stereoselectively synthesized via intermediates 4a and 5b', which were obtained by Simmons-Smith cyclopropanation of ethylester 3a and silyl ether 3b'. Compounds 1 and 2 showed strong growth inhibition in MDA-MB-231 breast cancer cells and improved metabolic stability in comparison to A. Compound 2 exhibited significant in vivo PD effects to increase tumor necrosis factor-alpha mRNA in a dose dependent manner.

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Organizational Affiliation: 

Pharmaceutical Research Division, Takeda Pharmaceutical Company Limited, Fujisawa, Kanagawa, Japan. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Baculoviral IAP repeat-containing protein 2	A, B	115	Homo sapiens	Mutation(s): 0  Gene Names: API1, BIRC2, IAP2, MIHB, RNF48 EC: 6.3.2 (PDB Primary Data), 2.3.2.27 (UniProt)
UniProt & NIH Common Fund Data Resources
Find proteins for Q13490 (Homo sapiens) Explore Q13490  Go to UniProtKB:  Q13490
PHAROS:  Q13490

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
1Y0	D [auth A], F [auth B]	(4S,6aR,7aS)-5-{(2S)-2-cyclohexyl-2-[(N-methyl-L-alanyl)amino]acetyl}-N-[(4R)-3,4-dihydro-2H-chromen-4-yl]octahydro-1H-cyclopropa[4,5]pyrrolo[1,2-a]pyrazine-4-carboxamide C30 H43 N5 O4 OGTGKCOHYGILPQ-BBAYRLSSSA-N
ZN	C [auth A], E [auth B]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Binding Affinity Annotations
ID	Source	Binding Affinity
1Y0	Binding MOAD:  4LGE	IC50: 3.5 (nM) from 1 assay(s)
	PDBBind:  4LGE	IC50: 3.5 (nM) from 1 assay(s)

Biologically Interesting Molecules (External Reference) 1 Unique

Entity ID: 3
ID	Chains	Name	Type/Class	2D Diagram	3D Interactions
PRD_001137 (1Y0)	D [auth A], F [auth B]	(4S,6aR,7aS)-5-{(2S)-2-cyclohexyl-2-[(N-methyl-L-alanyl)amino]acetyl}-N-[(4R)-3,4-dihydro-2H-chromen-4-yl]octahydro-1H-cyclopropa[4,5]pyrrolo[1,2-a]pyrazine-4-carboxamide	Peptide-like / Antagonist		Ligand Interaction

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.55 Å
• R-Value Free: 0.182 
• R-Value Work: 0.163 
• R-Value Observed: 0.164 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 30.52	α = 90
b = 72.805	β = 90
c = 116.914	γ = 90

Software Package:

Software Name	Purpose
HKL-2000	data collection
MOLREP	phasing
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2013-06-27 
• Released Date: 2013-08-28 
Deposition Author(s): Dougan, D.R.

Revision History  

• Version 1.0: 2013-08-28
  Type: Initial release