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Related Experiment Video

Updated: Jun 10, 2026

Antibody Binding Specificity for Kappa (Vκ) Light Chain-containing Human (IgM) Antibodies: Polysialic Acid (PSA) Attached to NCAM as a Case Study
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Arraying prostate specific antigen PSA and Fab anti-PSA using light-assisted molecular immobilization technology.

Antonietta Parracino1, Maria Teresa Neves-Petersen, Ane Kold di Gennaro

  • 1Department of Physics and Nanotechnology, Aalborg University, Aalborg, Denmark.

Protein Science : a Publication of the Protein Society
|July 29, 2010
PubMed
Summary

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We developed a new method using UV light to immobilize prostate specific antigen (PSA) and anti-PSA antibodies. This technique successfully creates biosensors for detecting PSA, a key cancer marker.

Area of Science:

  • Biophotonics
  • Biomolecular Engineering
  • Biosensor Technology

Background:

  • Prostate specific antigen (PSA) is a crucial biomarker for prostate cancer detection.
  • Current methods for PSA detection often require complex immobilization techniques.
  • Preserving protein activity during immobilization is vital for biosensor functionality.

Purpose of the Study:

  • To report the novel creation of prostate specific antigen (PSA) and Fab anti-PSA biosensor arrays.
  • To demonstrate the efficacy of UV light-assisted molecular immobilization (LAMI) for biosensor development.
  • To enable sensitive detection and quantification of PSA as a cancer marker.

Main Methods:

  • Utilized UV light-assisted molecular immobilization (LAMI) for protein attachment.

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  • Exploited UV excitation of aromatic residues near disulfide bridges to form reactive thiol groups.
  • Achieved oriented covalent immobilization of PSA and Fab anti-PSA onto thiol-reactive surfaces.

    • Main Results:

    • Successfully created functional PSA and Fab anti-PSA biosensor arrays.
    • Demonstrated that immobilized PSA was recognized by soluble Fab anti-PSA.
    • Confirmed that immobilized Fab anti-PSA cross-reacted with soluble PSA, validating protein activity preservation.

    Conclusions:

    • LAMI technology is effective for immobilizing biomedically relevant molecules while maintaining their activity.
    • UV light interaction with biomolecules opens avenues for novel biophotonic technologies.
    • This work advances engineering principles for designing and manipulating biological systems.