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Related Experiment Videos

Single-chain Fvs

R Raag1, M Whitlow

  • 1Department of Chemistry, University of California at Berkeley 94720.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|January 1, 1995
PubMed
Summary
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Single-chain variable fragments (sFvs) are antibody fragments that can form multimers. Linker modifications can stabilize specific sFv forms, influencing their structure and potential applications.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Immunotechnology

Background:

  • Single-chain Fvs (sFvs) are engineered antibody fragments comprising variable light (VL) and variable heavy (VH) domains linked by a polypeptide chain.
  • Their small size facilitates rapid pharmacokinetics and tumor penetration in vivo.
  • sFvs exhibit a concentration-dependent propensity to oligomerize, forming bivalent or multivalent structures through domain rearrangement.

Purpose of the Study:

  • To investigate the structural properties and oligomerization tendencies of single-chain Fvs.
  • To explore methods for stabilizing specific sFv multimeric or monomeric forms.
  • To understand the role of the polypeptide linker in sFv structure and stability.

Main Methods:

  • Analysis of sFv structure using Nuclear Magnetic Resonance (NMR) and X-ray crystallography.

Related Experiment Videos

  • Investigation of sFv domain rearrangement and reassociation dynamics.
  • Exploration of linker length modifications and antigen inclusion for structural stabilization.

    • Main Results:

    • NMR studies indicate that Fv and sFv structures are similar, with the sFv linker being flexible and disordered.
    • X-ray crystallography of three sFvs revealed disordered linkers.
    • Evidence suggests the potential for isolating monomeric and dimeric sFv forms through structural stabilization.

    Conclusions:

    • The flexible linker in sFvs plays a crucial role in their structural dynamics and oligomerization.
    • Modifying linker properties or incorporating antigen can control sFv assembly into specific forms.
    • Understanding these structural characteristics is key for optimizing sFv-based therapeutics and diagnostics.