Biological Assembly 1  

 3D View: Structure

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

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

Macromolecule Content

• Total Structure Weight: 26.21 kDa 
• Atom Count: 2009 
• Residue Count: 223 
• Unique protein chains: 2

1T29

Crystal structure of the BRCA1 BRCT repeats bound to a phosphorylated BACH1 peptide

• DOI: 10.2210/pdb1T29/pdb

• Classification: SIGNALING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2004-04-20 Released: 2004-05-11 
• Deposition Author(s): Shiozaki, E.N., Gu, L., Yan, N., Shi, Y.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 0.266 
• R-Value Work: 0.252 
• R-Value Observed: 0.252 

Literature

Structure of the BRCT repeats of BRCA1 bound to a BACH1 phosphopeptide: implications for signaling.

Shiozaki, E.N., Gu, L., Yan, N., Shi, Y.

(2004) Mol Cell 14: 405-412

• PubMed: 15125843 
• DOI: 10.1016/s1097-2765(04)00238-2
• Primary Citation of Related Structures:  
  1T29


• PubMed Abstract: 
  

The recognition of the phosphorylated BACH1 helicase by the BRCA1 C-terminal (BRCT) repeats is important to the tumor suppressor function of BRCA1. Here we report the crystal structure of the BRCT repeats of human BRCA1 bound to a phosphorylated BACH1 peptide at 2.3 A resolution. The phosphorylated serine 990 and phenylalanine 993 of BACH1 anchor the binding to BRCA1 through specific interactions with a surface cleft at the junction of the two BRCT repeats. This surface cleft is highly conserved in BRCA1 across species, suggesting an evolutionarily conserved function of phosphopeptide recognition. Importantly, conserved amino acids critical for BACH1 binding are frequently targeted for missense mutations in breast cancer. These mutations greatly diminish the ability of BRCA1 to interact with the phosphorylated BACH1 peptide. Additional structural analysis revealed significant implications for understanding the function of the BRCT family of proteins in DNA damage and repair signaling.

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Organizational Affiliation: 

Department of Molecular Biology, Lewis Thomas Laboratory, Princeton University, Princeton, NJ 08544, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Breast cancer type 1 susceptibility protein	A	214	Homo sapiens	Mutation(s): 0  Gene Names: BRCA1, RNF53 EC: 2.3.2.27
Find proteins for P38398 (Homo sapiens) Explore P38398  Go to UniProtKB:  P38398
NIH Common Fund Data Resources
PHAROS  P38398 GTEx  ENSG00000012048

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
BACH1 phosphorylated peptide	B	14	N/A	Mutation(s): 1
Find proteins for Q9BX63 (Homo sapiens) Explore Q9BX63  Go to UniProtKB:  Q9BX63
NIH Common Fund Data Resources
PHAROS  Q9BX63 GTEx  ENSG00000136492

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
SEP	B	L-PEPTIDE LINKING	C3 H8 N O6 P		SER

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 0.266 
• R-Value Work: 0.252 
• R-Value Observed: 0.252 
• Space Group: P 3₂ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 63.177	α = 90
b = 63.177	β = 90
c = 105.532	γ = 120

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
AMoRE	phasing
CNS	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-04-20 
• Released Date: 2004-05-11 
Deposition Author(s): Shiozaki, E.N., Gu, L., Yan, N., Shi, Y.

Revision History 

• Version 1.0: 2004-05-11
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance