1XB0

Structure of the BIR domain of IAP-like protein 2

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.223 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

The BIR domain of IAP-like protein 2 is conformationally unstable: implications for caspase inhibition

Shin, H., Renatus, M., Eckelman, B.P., Nunes, V.A., Sampaio, C.A.M., Salvesen, G.S.

(2005) Biochem J 385: 1-10

  • DOI: https://doi.org/10.1042/BJ20041107
  • Primary Citation of Related Structures:  
    1XB0, 1XB1

  • PubMed Abstract: 

    • Several IAP (inhibitor of apoptosis) proteins regulate cell fate decisions, and the X-linked IAP (XIAP) does so in part by inhibiting caspases, proteases that execute the apoptotic pathway. A tissue-specific homologue of XIAP, known as ILP2 (IAP-like protein 2), has previously been implicated in the control of apoptosis in the testis by direct inhibition of caspase 9 ...

    Several IAP (inhibitor of apoptosis) proteins regulate cell fate decisions, and the X-linked IAP (XIAP) does so in part by inhibiting caspases, proteases that execute the apoptotic pathway. A tissue-specific homologue of XIAP, known as ILP2 (IAP-like protein 2), has previously been implicated in the control of apoptosis in the testis by direct inhibition of caspase 9. In examining this protein we found that the putative caspase 9 interaction domain is a surprisingly weak inhibitor and is also conformationally unstable. Comparison with the equivalent domain in XIAP demonstrated that the instability is due to the lack of a linker segment N-terminal to the inhibitory BIR (baculovirus IAP repeat) domain. Fusion of a 9-residue linker from XIAP to the N-terminus of ILP2 restored tight caspase 9 inhibition, dramatically increased conformational stability and allowed crystallization of the ILP2 BIR domain in a form strikingly similar to the XIAP third BIR domain. We conclude that ILP2 is an unstable protein, and cannot inhibit caspase 9 in a physiological way on its own. We speculate that ILP2 requires assistance from unidentified cellular factors to be an effective inhibitor of apoptosis in vivo.

    Organizational Affiliation: 

    Program in Apoptosis and Cell Death Research, The Burnham Institute, 10901 North Torrey Pines Road, La Jolla, CA 92037, USA.



Macromolecules
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(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Baculoviral IAP repeat-containing protein 8108Homo sapiensMutation(s): 0 
Gene Names: BIRC8, ILP2
UniProt
Find proteins for Q96P09 (Homo sapiens)
Explore Q96P09 
Go to UniProtKB:  Q96P09
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ96P09
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Diablo homolog, mitochondrial7N/AMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9NR28 (Homo sapiens)
Explore Q9NR28 
Go to UniProtKB:  Q9NR28
PHAROS:  Q9NR28
Entity Groups  
UniProt GroupQ9NR28
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN
Download Ideal Coordinates CCD File 
AA [auth D],
BA [auth D],
CA [auth E],
DA [auth E],
EA [auth E],
AA [auth D],
BA [auth D],
CA [auth E],
DA [auth E],
EA [auth E],
FA [auth E],
GA [auth F],
HA [auth F],
IA [auth F],
JA [auth F],
M [auth A],
N [auth A],
O [auth A],
P [auth A],
Q [auth B],
R [auth B],
S [auth B],
T [auth B],
U [auth C],
V [auth C],
W [auth C],
X [auth C],
Y [auth D],
Z [auth D]
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.223 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 86.4α = 90
b = 86.4β = 90
c = 226.77γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
CNSrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-11-02
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance