Biological Assembly 1  

 3D View: Structure | Electron Density

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 6-mer - A2B2C2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 58712.56 
• Atom Count: 4077 
• Residue Count: 538 
• Unique protein chains: 3

1TZI

Crystal Structure of the Fab YADS2 Complexed with h-VEGF

• DOI: 10.2210/pdb1TZI/pdb

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


• Deposited: 2004-07-10 Released: 2004-08-31 
• Deposition Author(s): Fellouse, F.A., Wiesmann, C., Sidhu, S.S.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.8 Å
• R-Value Free: 0.254 
• R-Value Work: 0.218 

Literature

Synthetic antibodies from a four-amino-acid code: A dominant role for tyrosine in antigen recognition

Fellouse, F.A., Wiesmann, C., Sidhu, S.S.

(2004) Proc.Natl.Acad.Sci.USA 101: 12467-12472

• PubMed: 15306681 
• DOI: 10.1073/pnas.0401786101
• Primary Citation of Related Structures:  
  1TZH


• PubMed Abstract: 
  

Antigen-binding fragments (Fabs) with synthetic antigen-binding sites were isolated from phage-displayed libraries with restricted complementarity-determining region (CDR) diversity. Libraries were constructed such that solvent-accessible CDR positions were randomized with a degenerate codon that encoded for only four amino acids (tyrosine, alanine, aspartate, and serine). Nonetheless, high-affinity Fabs (K(d) = 2-10 nM) were isolated against human vascular endothelial growth factor (hVEGF), and the crystal structures were determined for two distinct Fab-hVEGF complexes. The structures revealed that antigen recognition was mediated primarily by tyrosine side chains, which accounted for 71% of the Fab surface area that became buried upon binding to hVEGF. In contrast, aspartate residues within the CDRs were almost entirely excluded from the binding interface. Alanine and serine residues did not make many direct contacts with antigen, but they allowed for space and conformational flexibility and thus played an auxiliary role in facilitating productive contacts between tyrosine and antigen. Tyrosine side chains were capable of mediating most of the contacts necessary for high-affinity antigen recognition, and, thus, it seems likely that the overabundance of tyrosine in natural antigen-binding sites is a consequence of the side chain being particularly well suited for making productive contacts with antigen. The findings shed light on the basic principles governing the evolution of natural immune repertoires and should also aid the development of improved synthetic antibody libraries.

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Related Citations: 

• Phage-displayed antibody libraries of synthetic heavy chain complementarity determining regions
  Sidhu, S.S.,Li, B.,Chen, Y.,Fellouse, F.A.,Eigenbrot, C.,Fuh, G.
  (2004) J.Mol.Biol. 338: 299




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Organizational Affiliation: 

Department of Protein Engineering, Genentech Inc., 1 DNA Way, South San Francisco, CA 94080, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Fab YADS2 Light Chain	A	214	N/A	Mutation(s): 0
Protein Feature View is not available: No corresponding UniProt sequence found.

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Fab YADS2 Heavy Chain	B	222	N/A	Mutation(s): 0
Protein Feature View is not available: No corresponding UniProt sequence found.

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details
Vascular endothelial growth factor A	V	102	Homo sapiens	Mutation(s): 0  Gene Names: VEGFA (VEGF)
Find proteins for P15692 (Homo sapiens) Go to Gene View: VEGFA Go to UniProtKB:  P15692

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.8 Å
• R-Value Free: 0.254 
• R-Value Work: 0.218 
• Space Group: C 2 2 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 96.504	α = 90.00
b = 149.588	β = 90.00
c = 117.421	γ = 90.00

Software Package:

Software Name	Purpose
REFMAC	refinement
SCALEPACK	data scaling
AMoRE	phasing
HKL-2000	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-07-10 
• Released Date: 2004-08-31 
• Deposition Author(s): Fellouse, F.A., Wiesmann, C., Sidhu, S.S.

Revision History 

• Version 1.0: 2004-08-31
  Type: Initial release
• Version 1.1: 2008-04-30
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Advisory, Version format compliance