pH-sensitive pHluorins as a molecular sensor for in situ monitoring of enzyme-catalyzed prodrug activation

Hui Liu, Xiaodan Cao, Ping Wang, Xingyuan Ma

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

This work examines the feasibility of using a pH-sensitive fluorescent protein as a molecular reporter for enzyme-catalyzed prodrug activation reaction. Specifically, a ratiometric pHluorins was examined for detection of the activity of horseradish peroxidase (HRP) for the activation of indole-3-acetic acid. The pHluorins and HRP were conjugated chemically, forming a biocatalyst with a self-reporting function. Results showed that the characteristic fluorescence intensity ratio of the conjugate shifted from 1.47 to 1.40 corresponding to the progress of the prodrug activation reaction. The effectiveness of applying the conjugate for inhibition of the growth of Bcap-37 cells was also demonstrated simultaneously with reaction monitoring. The results reveal a very promising approach to realizing in situ monitoring of enzyme activities based on pH shifting for enzyme-based prodrug therapy applications.

Original languageEnglish (US)
Pages (from-to)482-489
Number of pages8
JournalBiotechnology and Applied Biochemistry
Volume64
Issue number4
DOIs
StatePublished - Jul 1 2017
Externally publishedYes

Keywords

  • Bcap-37
  • HRP
  • IAA
  • enzyme/prodrug therapy
  • ratiometric pHluorins

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