Biological Assembly 1  

 3D View: Structure

Standalone Viewers  
Protein Workshop | Ligand Explorer

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

Biological assembly 1 assigned by authors.

Biological Assembly 2  

 3D View: Structure

Standalone Viewers  
Protein Workshop | Ligand Explorer

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

Biological assembly 2 assigned by authors.

Macromolecule Content

• Total Structure Weight: 48608.00 
• Atom Count: 3017 
• Residue Count: 432 
• Unique protein chains: 1

1PBW

STRUCTURE OF BCR-HOMOLOGY (BH) DOMAIN

• DOI: 10.2210/pdb1PBW/pdb

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


• Deposited: 1996-10-17 Released: 1997-03-12 
• Deposition Author(s): Musacchio, A., Cantley, L.C., Harrison, S.C.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2 Å
• R-Value Free: 0.235 
• R-Value Work: 0.184 

Literature

Crystal structure of the breakpoint cluster region-homology domain from phosphoinositide 3-kinase p85 alpha subunit.

Musacchio, A., Cantley, L.C., Harrison, S.C.

(1996) Proc.Natl.Acad.Sci.USA 93: 14373-14378

• PubMed: 8962058 
• DOI: 10.1073/pnas.93.25.14373


• PubMed Abstract: 
  

Proteins such as the product of the break-point cluster region, chimaerin, and the Src homology 3-binding protein 3BP1, are GTPase activating proteins (GAPs) for members of the Rho subfamily of small GTP-binding proteins (G proteins or GTPases). A 200-residue region, named the breakpoint cluster region-homology (BH) domain, is responsible for the GAP activity. We describe here the crystal structure of the BH domain from the p85 subunit of phosphatidylinositol 3-kinase at 2.0 A resolution. The domain is composed of seven helices, having a previously unobserved arrangement. A core of four helices contains most residues that are conserved in the BH family. Their packing suggests the location of a G-protein binding site. This structure of a GAP-like domain for small GTP-binding proteins provides a framework for analyzing the function of this class of molecules.

---

Related Citations: 

• Cloning of Pi3 Kinase-Associated P85 Utilizing a Novel Method for Expression/Cloning of Target Proteins for Receptor Tyrosine Kinases
  Skolnik, E.Y.,Margolis, B.,Mohammadi, M.,Lowenstein, E.,Fischer, R.,Drepps, A.,Ullrich, A.,Schlessinger, J.
  (1991) Cell 65: 83




---

Organizational Affiliation: 

Laboratory of Molecular Medicine, Children's Hospital, Boston, MA 02115, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
PHOSPHATIDYLINOSITOL 3-KINASE	A, B	216	Homo sapiens	Mutation(s): 0  Gene Names: PIK3R1 (GRB1)
Find proteins for P27986 (Homo sapiens) Go to Gene View: PIK3R1 Go to UniProtKB:  P27986

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2 Å
• R-Value Free: 0.235 
• R-Value Work: 0.184 
• Space Group: P 1 2₁ 1

Unit Cell:

Length (Å)	Angle (°)
a = 39.051	α = 90.00
b = 90.513	β = 97.19
c = 69.280	γ = 90.00

Software Package:

Software Name	Purpose
ARP/wARP	model building
DENZO	data reduction
X-PLOR	phasing
X-PLOR	model building
X-PLOR	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1996-10-17 
• Released Date: 1997-03-12 
• Deposition Author(s): Musacchio, A., Cantley, L.C., Harrison, S.C.

Revision History 

• Version 1.0: 1997-03-12
  Type: Initial release
• Version 1.1: 2008-03-24
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance