Engineered fragments of the psma-specific 5d3 antibody and their functional characterization

Zora Novakova, Nikola Belousova, Catherine A. Foss, Barbora Havlinova, Marketa Gresova, Gargi Das, Ala Lisok, Adam Prada, Marketa Barinkova, Martin Hubalek, Martin G. Pomper, Cyril Barinka

Research output: Contribution to journalArticlepeer-review


Prostate-Specific Membrane Antigen (PSMA) is an established biomarker for the imaging and experimental therapy of prostate cancer (PCa), as it is strongly upregulated in high-grade primary, androgen-independent, and metastatic lesions. Here, we report on the development and functional characterization of recombinant single-chain Fv (scFv) and Fab fragments derived from the 5D3 PSMA-specific monoclonal antibody (mAb). These fragments were engineered, heterologously expressed in insect S2 cells, and purified to homogeneity with yields up to 20 mg/L. In vitro assays including ELISA, immunofluorescence and flow cytometry, revealed that the fragments retain the nanomolar affinity and single target specificity of the parent 5D3 antibody. Importantly, using a murine xenograft model of PCa, we verified the suitability of fluorescently labeled fragments for in vivo imaging of PSMA-positive tumors and compared their pharmacokinetics and tissue distribution to the parent mAb. Collectively, our data provide an experimental basis for the further development of 5D3 recombinant fragments for future clinical use.

Original languageEnglish (US)
Article number6672
Pages (from-to)1-21
Number of pages21
JournalInternational journal of molecular sciences
Issue number18
StatePublished - Sep 2 2020


  • Antibody fragment
  • Glutamate carboxypeptidase II
  • In vivo imaging
  • Monoclonal antibody
  • NAALADase
  • Prostate cancer
  • Prostate-specific membrane antigen

ASJC Scopus subject areas

  • Catalysis
  • Molecular Biology
  • Spectroscopy
  • Computer Science Applications
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry


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