Characterization of the binding of the Finland trityl radical with bovine serum albumin

Yuguang Song, Yangping Liu, Wenbo Liu, Frederick A. Villamena, Jay L. Zweier

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


Understanding the interactions of trityl radicals with proteins is required to expand their biomedical applications. In this work, we demonstrate that the Finland trityl radical CT-03 binds to bovine serum albumin (BSA) in aqueous solution. Upon binding with BSA, CT-03 exhibits a much broader electron paramagnetic resonance (EPR) signal and this line broadening can be reversed by proteolysis of the BSA. The binding induces a red-shift of the maximal UV-Vis absorbance wavelength of CT-03 around 470 nm, likely due to localization of CT-03 in the relatively hydrophobic region of the protein. The interaction between CT-03 and BSA is driven by a hydrophobic interaction with an estimated binding constant of 2.18 × 105 M-1 at 298 K. Furthermore, only one CT-03 is bound to each molecule of BSA and the binding site is determined to be the sub-domain IIA (Sudlow's site I). This protein binding of the trityl probe to albumin can be used to study the structure and function of albumin and also must be considered for its use as an in vivo imaging agent or spin label. This journal is

Original languageEnglish (US)
Pages (from-to)47649-47656
Number of pages8
JournalRSC Advances
Issue number88
StatePublished - 2014
Externally publishedYes

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)


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