Biological Assembly 1  

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

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

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 2 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 20.64 kDa 
• Atom Count: 1327 
• Modelled Residue Count: 149 
• Deposited Residue Count: 188 
• Unique protein chains: 2

4JIF

Co-crystal structure of ICAP1 PTB domain in complex with a KRIT1 peptide

• PDB DOI: 10.2210/pdb4JIF/pdb

• Classification: SIGNALING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2013-03-05 Released: 2013-05-01 
• Deposition Author(s): Liu, W., Boggon, T.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Free: 0.226 
• R-Value Work: 0.196 
• R-Value Observed: 0.197 

Literature

Cocrystal structure of the ICAP1 PTB domain in complex with a KRIT1 peptide.

Liu, W., Boggon, T.J.

(2013) Acta Crystallogr Sect F Struct Biol Cryst Commun 69: 494-498

• PubMed: 23695561 
• DOI: 10.1107/S1744309113010762
• Primary Citation of Related Structures:  
  4JIF


• PubMed Abstract: 
  

Integrin cytoplasmic domain-associated protein-1 (ICAP1) is a suppressor of integrin activation and directly binds to the cytoplasmic tail of β1 integrins; its binding suppresses integrin activation by competition with talin. Krev/Rap1 interaction trapped-1 (KRIT1) releases ICAP1 suppression of integrin activation by sequestering ICAP1 away from integrin cytoplasmic tails. Here, the cocrystal structure of the PTB domain of ICAP1 in complex with a 29-amino-acid fragment (residues 170-198) of KRIT1 is presented to 1.7 Å resolution [the resolution at which 〈I/σ(I)〉 = 2.9 was 1.83 Å]. In previous studies, the structure of ICAP1 with integrin β1 was determined to 3.0 Å resolution and that of ICAP1 with the N-terminal portion of KRIT1 (residues 1-198) was determined to 2.54 Å resolution; therefore, this study provides the highest resolution structure yet of ICAP1 and allows further detailed analysis of the interaction of ICAP1 with its minimal binding region in KRIT1.

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Organizational Affiliation: 

Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520, USA. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Integrin beta-1-binding protein 1	A	154	Homo sapiens	Mutation(s): 0  Gene Names: ITGB1BP1, ICAP1
UniProt & NIH Common Fund Data Resources
Find proteins for O14713 (Homo sapiens) Explore O14713  Go to UniProtKB:  O14713
PHAROS:  O14713

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Krev interaction trapped protein 1	B	34	Homo sapiens	Mutation(s): 0  Gene Names: KRIT1, CCM1
UniProt & NIH Common Fund Data Resources
Find proteins for O00522 (Homo sapiens) Explore O00522  Go to UniProtKB:  O00522
PHAROS:  O00522

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Free: 0.226 
• R-Value Work: 0.196 
• R-Value Observed: 0.197 
• Space Group: P 6₅ 2 2
• Diffraction Data DOI: 10.15785/SBGRID/548 SBGrid

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 81.017	α = 90
b = 81.017	β = 90
c = 89.583	γ = 120

Software Package:

Software Name	Purpose
CBASS	data collection
PHASER	phasing
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2013-03-05 
• Released Date: 2013-05-01 
Deposition Author(s): Liu, W., Boggon, T.J.

Revision History  

• Version 1.0: 2013-05-01
  Type: Initial release
  
• Version 1.1: 2013-07-10
  Changes: Database references