Site-specific radiolabeling of monoclonal antibodies with biotin/streptavidin

Renato B. Del Rosario, Richard L. Wahl

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Sulfhydryl groups of a murine IgG2a monoclonal antibody, 5G6.4, were site-specifically biotinylated with N-iodo-acetyl-N′-biotinylhexylenediamine (compound 1) following partial reduction of disulfide bonds. Antibody labeling using fluoresceinated or [125I]streptavidin were consistent with sulfhydryl group-specific incorporation of label with good retention of immunoreactivity, mainly in the form of high molecular weight oligomers (molecular weight ≈ > 400,000). In vivo localization of the radioantibody complex to xenografts of ovarian carcinoma was achieved. This approach appears to be a promising method of labeling monoclonal antibodies.

Original languageEnglish (US)
Pages (from-to)525-527,529
JournalInternational Journal of Radiation Applications and Instrumentation.
Issue number5
StatePublished - 1989
Externally publishedYes

ASJC Scopus subject areas

  • General Medicine


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