Non-immunological detection of PhoA fusion proteins

Linda H. Phillips, La Shauna Chambers, Ricardo Belmares, David W. Niesel

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


A non-immunological method for the detection of PhoA fusion proteins on Western blots has been developed. Bands representing the alkaline phosphatase-active species of the fusion proteins are visualized after incubation with the colorimetric alkaline phosphatase substrates nitroblue tetrazolium and 5-bromo-4-chloro-3-indolyl phosphate. Blocking the filters in 3% gelatin in Tris buffered saline containing 0.05% Tween-20 prior to color development is essential, and reactions are enhanced by extending blocking and development times. Fusion proteins can be detected over a broad protein concentration range. This method is based upon the ability of the fusion proteins to renature and regain enzymatic activity after immobilization on nitrocellulose.

Original languageEnglish (US)
Pages (from-to)13-22
Number of pages10
JournalJournal of Microbiological Methods
Issue number1
StatePublished - Aug 1992
Externally publishedYes


  • Alkaline phosphatase
  • Fusion proteins
  • Western blot

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology
  • Microbiology (medical)


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