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Biochemistry JoVE (Open Access) Citable · DOI

Qualitative and Quantitative Assays for Detection and Characterization of Protein Antimicrobials

DOI: 10.3791/53819-v
What you'll learn
  • ✓ Perform microslide diffusion assay for qualitative antimicrobial enzyme screening
  • ✓ Label bacterial substrates with Remazol Brilliant Blue R dye
  • ✓ Execute dye-release assay for quantitative enzymatic activity measurement
  • ✓ Interpret and characterize novel protein antimicrobial candidates
Protocol

Biopharma Insights Here, we present protocols to rapidly screen and characterize enzymes for antimicrobial activity. The microslide diffusion assay and the dye-release assay utilize target bacterial substrates for qualitative and quantitative enzymatic activity evaluation.

Difficulty
intermediate
Total time
~4–6 hours per assay set (includes bacterial culture preparation, substrate labeling, and assay incubation)
Biosafety
BSL-1

Steps

1
Perform qualitative microslide diffusion assay

Set up a microslide diffusion assay using target bacterial substrates to qualitatively detect enzymatic antimicrobial activity. Spot enzyme samples and observe diffusion-based inhibition zones.

▶ 00:42
2
Label substrate with Remazol Brilliant Blue R dye

Prepare bacterial substrates by labeling with Remazol Brilliant Blue R dye to enable colorimetric detection in subsequent quantitative assays.

▶ 03:37
3
Execute quantitative dye-release assay

Perform the dye-release assay using labeled bacterial substrates to quantitatively measure enzymatic activity. Quantify enzyme-mediated dye release spectrophotometrically.

▶ 05:38
4
Interpret results and characterize antimicrobials

Analyze qualitative and quantitative assay data to detect and characterize novel protein antimicrobial candidates, comparing enzymatic activity profiles.

▶ 08:20
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