5FUO

Extending the half-life of a Fab fragment through generation of a humanised anti-Human Serum Albumin (HSA) Fv domain: an investigation into the correlation between affinity and serum half-life


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.6 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.215 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Extending the Half-Life of a Fab Fragment Through Generation of a Humanized Anti-Human Serum Albumin Fv Domain: An Investigation Into the Correlation between Affinity and Serum Half-Life.

Adams, R.Griffin, L.Compson, J.E.Jairaj, M.Baker, T.Ceska, T.West, S.Zaccheo, O.Dave, E.Lawson, A.D.G.Humphreys, D.P.Heywood, S.

(2016) Mabs 8: 1336

  • DOI: 10.1080/19420862.2016.1185581
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • We generated an anti-albumin antibody, CA645, to link its Fv domain to an antigen-binding fragment (Fab), thereby extending the serum half-life of the Fab. CA645 was demonstrated to bind human, cynomolgus, and mouse serum albumin with similar affinit ...

    We generated an anti-albumin antibody, CA645, to link its Fv domain to an antigen-binding fragment (Fab), thereby extending the serum half-life of the Fab. CA645 was demonstrated to bind human, cynomolgus, and mouse serum albumin with similar affinity (1-7 nM), and to bind human serum albumin (HSA) when it is in complex with common known ligands. Importantly for half-life extension, CA645 binds HSA with similar affinity within the physiologically relevant range of pH 5.0 - pH 7.4, and does not have a deleterious effect on the binding of HSA to neonatal Fc receptor (FcRn). A crystal structure of humanized CA645 Fab in complex with HSA was solved and showed that CA645 Fab binds to domain II of HSA. Superimposition with the crystal structure of FcRn bound to HSA confirmed that CA645 does not block HSA binding to FcRn. In mice, the serum half-life of humanized CA645 Fab is 84.2 h. This is a significant extension in comparison with < 1 h for a non-HSA binding CA645 Fab variant. The Fab-HSA structure was used to design a series of mutants with reduced affinity to investigate the correlation between the affinity for albumin and serum half-life. Reduction in the affinity for MSA by 144-fold from 2.2 nM to 316 nM had no effect on serum half-life. Strikingly, despite a reduction in affinity to 62 µM, an extension in serum half-life of 26.4 h was still obtained. CA645 Fab and the CA645 Fab-HSA complex have been deposited in the Protein Data Bank (PDB) with accession codes, 5FUZ and 5FUO, respectively.


    Organizational Affiliation

    c Lonza Biologics PLC , Slough , Berkshire , UK.,a UCB Celltech , Slough , UK.,b Ashfield Healthcare Communications , Macclesfield , Cheshire , UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SERUM ALBUMIN
A
585Homo sapiensMutation(s): 0 
Gene Names: ALB
Find proteins for P02768 (Homo sapiens)
Go to Gene View: ALB
Go to UniProtKB:  P02768
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
FAB HEAVY CHAIN
H
233N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
FAB LIGHT CHAIN
L
217N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.6 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.215 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 217.640α = 90.00
b = 217.640β = 90.00
c = 78.650γ = 120.00
Software Package:
Software NamePurpose
PHASERphasing
CNSrefinement
XDSdata reduction
XDSdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2016-01-28 
  • Released Date: 2016-06-29 
  • Deposition Author(s): Adams, R., Ceska, T.

Revision History 

  • Version 1.0: 2016-06-29
    Type: Initial release
  • Version 1.1: 2016-11-09
    Type: Database references