Macromolecule Content

• Total Structure Weight: 14025.05 
• Atom Count: 985 
• Residue Count: 117 
• Unique protein chains: 1

1TFT

NMR Structure of an Antagonists of the XIAP-Caspase-9 Interaction Complexed to the BIR3 domain of XIAP

• DOI: 10.2210/pdb1TFT/pdb

• Classification: APOPTOSIS
• Organism(s): Homo sapiens
• Expression System: Escherichia coli


• Deposited: 2004-05-27 Released: 2005-05-03 
• Deposition Author(s): Oost, T.K., Sun, C., Armstrong, R.C., Al-Assaad, A.S., Betz, S.F., Deckwerth, T.L., Elmore, S.W., Meadows, R.P., Olejniczak, E.T., Oleksijew, A.K., Oltersdorf, T., Rosenberg, S.H., Shoemaker, A.R., Zou, H., Fesik, S.W.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Submitted: 1 

Literature

Discovery of potent antagonists of the antiapoptotic protein XIAP for the treatment of cancer.

Oost, T.K., Sun, C., Armstrong, R.C., Al-Assaad, A.S., Betz, S.F., Deckwerth, T.L., Ding, H., Elmore, S.W., Meadows, R.P., Olejniczak, E.T., Oleksijew, A.K., Oltersdorf, T., Rosenberg, S.H., Shoemaker, A.R., Tomaselli, K.J., Zou, H., Fesik, S.W.

(2004) J.Med.Chem. 47: 4417-4426

• PubMed: 15317454 
• DOI: 10.1021/jm040037k
• Primary Citation of Related Structures:  
  1TFQ


• PubMed Abstract: 
  

Inhibitor of apoptosis (IAP) proteins are overexpressed in many cancers and have been implicated in tumor growth, pathogenesis, and resistance to chemo- or radiotherapy. On the basis of the NMR structure of a SMAC peptide complexed with the BIR3 domain of X-linked IAP (XIAP), a novel series of XIAP antagonists was discovered. The most potent compounds in this series bind to the baculovirus IAP repeat 3 (BIR3) domain of XIAP with single-digit nanomolar affinity and promote cell death in several human cancer cell lines. In a MDA-MB-231 breast cancer mouse xenograft model, these XIAP antagonists inhibited the growth of tumors. Close structural analogues that showed only weak binding to the XIAP-BIR3 domain were inactive in the cellular assays and showed only marginal in vivo activity. Our results are consistent with a mechanism in which ligands for the BIR3 domain of XIAP induce apoptosis by freeing up caspases. The present study validates the BIR3 domain of XIAP as a target and supports the use of small molecule XIAP antagonists as a potential therapy for cancers that overexpress XIAP.

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Organizational Affiliation: 

Cancer Research, Global Pharmaceutical Research and Development, Abbott Laboratories, 100 Abbott Park Road, Abbott Park, Illinois 60064, USA. [e-mail]

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Baculoviral IAP repeat-containing protein 4	A	117	Homo sapiens	Mutation(s): 0  Gene Names: XIAP (API3, BIRC4, IAP3) EC: 2.3.2.27
Find proteins for P98170 (Homo sapiens) Go to Gene View: XIAP Go to UniProtKB:  P98170

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
ZN	A	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
997	A	1-[3,3-DIMETHYL-2-(2-METHYLAMINO-PROPIONYLAMINO)-BUTYRYL]-4-PHENOXY-PYRROLIDINE-2-CARBOXYLIC ACID(1,2,3,4-TETRAHYDRO-NAPHTHALEN-1-YL)-AMIDE N-METHYLALANYL-3-METHYLVALYL-4-PHENOXY-N-(1,2,3,4-TETRAHYDRONAPHTHALEN-1-YL)PROLINAMIDE C31 H42 N4 O4 QKPXPZYQPBWDHS-MCJAPYMPSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
997	Kd: 5 nM (100) BINDINGDB
997	Kd: 5 nM PDBBIND

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Submitted: 1 

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-05-27 
• Released Date: 2005-05-03 
• Deposition Author(s): Oost, T.K., Sun, C., Armstrong, R.C., Al-Assaad, A.S., Betz, S.F., Deckwerth, T.L., Elmore, S.W., Meadows, R.P., Olejniczak, E.T., Oleksijew, A.K., Oltersdorf, T., Rosenberg, S.H., Shoemaker, A.R., Zou, H., Fesik, S.W.

Revision History 

• Version 1.0: 2005-05-03
  Type: Initial release
• Version 1.1: 2008-04-30
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance