1GAF

48G7 HYBRIDOMA LINE FAB COMPLEXED WITH HAPTEN 5-(PARA-NITROPHENYL PHOSPHONATE)-PENTANOIC ACID


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.307 
  • R-Value Work: 0.244 
  • R-Value Observed: 0.244 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The immunological evolution of catalysis.

Patten, P.A.Gray, N.S.Yang, P.L.Marks, C.B.Wedemayer, G.J.Boniface, J.J.Stevens, R.C.Schultz, P.G.

(1996) Science 271: 1086-1091

  • DOI: 10.1126/science.271.5252.1086
  • Primary Citation of Related Structures:  
    1GAF

  • PubMed Abstract: 
  • The germline genes used by the mouse to generate the esterolytic antibody 48G7 were cloned and expressed in an effort to increase our understanding of the detailed molecular mechanisms by which the immune system evolves catalytic function. The nine r ...

    The germline genes used by the mouse to generate the esterolytic antibody 48G7 were cloned and expressed in an effort to increase our understanding of the detailed molecular mechanisms by which the immune system evolves catalytic function. The nine replacement mutations that were fixed during affinity maturation increased affinity for the transition state analogue by a factor of 10(4), primarily the result of a decrease in the dissociation rate of the hapten-antibody complex. There was a corresponding increase in the rate of reaction of antibody with substrate, k(cat)/k(m), from 1.7 x 10(2)M(-1) min(-1) to 1.4 x 10(4)M(-1) min(-1). The three-dimensional crystal structure of the 48G7-transition state analogue complex at 2.0 angstroms resolution indicates that one of the nine residues in which somatic mutations have been fixed directly contact the hapten. Thus, in the case of 48G7, affinity maturation appears to play a conformational role, either in reorganizing the active site geometry of limiting side-chain and backbone flexibility of the germline antibody. The crystal structure and analysis of somatic and directed active site mutants underscore the role of transition state stabilization in the evolution of this catalytic antibody.


    Related Citations: 
    • A Genetic Approach to the Generation of Antibodies with Enhanced Catalytic Activities
      Lesley, S.A., Patten, P.A., Schultz, P.G.
      (1993) Proc Natl Acad Sci U S A 90: 1160

    Organizational Affiliation

    Howard Hughes Medical Institute, Department of Chemistry, University of California, Berkeley, CA 94720, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CHIMERIC 48G7 FABL214Homo sapiensMutation(s): 0 
Gene Names: IGKC
Find proteins for P01834 (Homo sapiens)
Explore P01834 
Go to UniProtKB:  P01834
NIH Common Fund Data Resources
PHAROS  P01834
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
CHIMERIC 48G7 FABH217Homo sapiensMutation(s): 0 
Gene Names: IGHG1
Find proteins for P01857 (Homo sapiens)
Explore P01857 
Go to UniProtKB:  P01857
NIH Common Fund Data Resources
PHAROS  P01857
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NPE
Query on NPE

Download CCD File 
H
5-(PARA-NITROPHENYL PHOSPHONATE)-PENTANOIC ACID
C11 H13 N O7 P
XVVZSEXTAACTPS-UHFFFAOYSA-M
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
NPEKd:  10   nM  Binding MOAD
NPEKd :  10   nM  PDBBind
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.307 
  • R-Value Work: 0.244 
  • R-Value Observed: 0.244 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 140.26α = 90
b = 44.85β = 121.55
c = 85.45γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1996-07-11
    Type: Initial release
  • Version 1.1: 2008-03-03
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance