PreprintCited by 5Peptidase Inhibition and AnalysisMonoclonal and Polyclonal Antibodies ResearchEnzyme Structure and Function

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Cryo-electron microscopy reveals a single domain antibody with a unique binding epitope on fibroblast activation protein alpha

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Preprint — published as 10.1039/d4cb00267a · Paper page

Abstract

Fibroblast activation protein alpha (FAP) is a serine protease that is expressed at basal levels in benign tissues but is overexpressed in a variety of pathologies, including cancer. Despite this unique expression profile, designing effective diagnostic and therapeutic agents that effectively target this biomarker remain elusive. Here we report the structural characterization of the interaction between a novel single domain antibody (sdAbs), I3, and FAP using cryo-electron microscopy. The reconstructions were determined to a resolution of 2.7 Å and contained two distinct populations; one I3 bound and two I3 molecules bound to the FAP dimer. In both cases, the sdAbs bound a unique epitope that was distinct from the active site of the enzyme. Furthermore, this report describes the rational mutation of specific residues within the complementarity determining region 3 (CDR3) loop to enhance affinity and selectivity of the I3 molecule for FAP. This report represents the first sdAb-FAP structure to be described in the literature.

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Metadata

Authors
Xu, Z., Sinha, A., Pandya, D. N., Schnicker, N. J., & Wadas, T. J.
Affiliations
University of Iowa (US)
Corresponding author
  • Schnicker, Nicholas J.
  • Wadas, Thaddeus J.
Venue
RSC Chemical Biology
Publisher
openRxiv
Published
2024-10-20
Volume
6
Issue
5
Pages
780-787
ISSN
2633-0679 (ISSN-L)
OpenAlex
W4407219915
Cited by
5
References
1
Citations by year
2026: 3 · 2025: 2
FWCI
2.06
Type
journal article
Language
en
Open access
Locations
  • RSC Chemical Biology (publishedVersion, cc-by-nc)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • PubMed Central (submittedVersion, cc-by-nc)
Funders
  • University of Pennsylvania
  • Division of Cancer Prevention, National Cancer Institute (P30 CA086862, R21-CA219899, R21-CA227709)
  • Iowa State University
  • Perelman School of Medicine, University of Pennsylvania
  • Holden Comprehensive Cancer Center, University of Iowa (P30-CA086862)
  • Roy J. and Lucille A. Carver College of Medicine, University of Iowa
  • National Cancer Institute (R21CA219899, R21CA227709, P30CA086862)
  • Congressionally Directed Medical Research Programs (W81XWH-19-1-0046)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Peptidase Inhibition and Analysis
  • Life Sciences › Immunology and Microbiology › Immunology › Monoclonal and Polyclonal Antibodies Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Structural Biology › Enzyme Structure and Function
Keywords
fibroblast activation protein, nanobodies, antibody-antigen complex structure, binding epitope, serine protease, CDR3, protein dimer

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