Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Helical - H  (3D View)
Global Stoichiometry: Homo 3-mer - A3 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 106.24 kDa 
• Atom Count: 8092 
• Residue Count: 912 
• Unique protein chains: 1

1B47

STRUCTURE OF THE N-TERMINAL DOMAIN OF CBL IN COMPLEX WITH ITS BINDING SITE IN ZAP-70

• DOI: 10.2210/pdb1B47/pdb

• Classification: SIGNAL TRANSDUCTION
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1999-01-06 Released: 1999-04-27 
• Deposition Author(s): Meng, W., Sawasdikosol, S., Burakoff, S.J., Eck, M.J.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.266 
• R-Value Work: 0.218 
• R-Value Observed: 0.218 

Literature

Structure of the amino-terminal domain of Cbl complexed to its binding site on ZAP-70 kinase.

Meng, W., Sawasdikosol, S., Burakoff, S.J., Eck, M.J.

(1999) Nature 398: 84-90

• PubMed: 10078535 
• DOI: 10.1038/18050
• Primary Citation of Related Structures:  
  1B47, 2CBL


• PubMed Abstract: 
  

Cbl is an adaptor protein that functions as a negative regulator of many signalling pathways that start from receptors at the cell surface. The evolutionarily conserved amino-terminal region of Cbl (Cbl-N) binds to phosphorylated tyrosine residues and has cell-transforming activity. Point mutations in Cbl that disrupt its recognition of phosphotyrosine also interfere with its negative regulatory function and, in the case of v-cbl, with its oncogenic potential. In T cells, Cbl-N binds to the tyrosine-phosphorylated inhibitory site of the protein tyrosine kinase ZAP-70. Here we describe the crystal structure of Cbl-N, both alone and in complex with a phosphopeptide that represents its binding site in ZAP-70. The structures show that Cbl-N is composed of three interacting domains: a four-helix bundle (4H), an EF-hand calcium-binding domain, and a divergent SH2 domain that was not recognizable from the amino-acid sequence of the protein. The calcium-bound EF hand wedges between the 4H and SH2 domains and roughly determines their relative orientation. In the ligand-occupied structure, the 4H domain packs against the SH2 domain and completes its phosphotyrosine-recognition pocket. Disruption of this binding to ZAP-70 as a result of structure-based mutations in the 4H, EF-hand and SH2 domains confirms that the three domains together form an integrated phosphoprotein-recognition module.

---

Organizational Affiliation: 

Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Dana-Farber Cancer Institute, Boston, Massachusetts 02115, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CBL	A, B, C	304	Homo sapiens	Mutation(s): 0  Gene Names: CBL, CBL2, RNF55 EC: 2.3.2.27
Find proteins for P22681 (Homo sapiens) Explore P22681  Go to UniProtKB:  P22681
NIH Common Fund Data Resources
PHAROS  P22681 GTEx  ENSG00000110395

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CA	A, B, C	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.266 
• R-Value Work: 0.218 
• R-Value Observed: 0.218 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 159.96	α = 90
b = 105.48	β = 92.06
c = 84.92	γ = 90

Software Package:

Software Name	Purpose
HEAVY	model building
PATSOL	model building
CNS	refinement
MOSFLM	data reduction
CCP4	data scaling
HEAVY	phasing
PATSOL	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1999-01-06 
• Released Date: 1999-04-27 
Deposition Author(s): Meng, W., Sawasdikosol, S., Burakoff, S.J., Eck, M.J.

Revision History 

• Version 1.0: 1999-04-27
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance