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#luciferase

3 public questions tagged with this topic.

Sequencing

What does luciferase do in pyrosequencing?

In pyrosequencing, light emission provides quantitative readout of nucleotide incorporation. Once ATP is generated from released pyrophosphate by ATP sulfurylase, firefly luciferase catalyzes the ATP-dependent oxidation of D-luciferin to oxyluciferin, producing a flash of yellow-green light. Emission is captured by a sensitive CCD camera, and peak height correlates with number of identical bases added consecutively. DNA polymerase extends strand, ATP sulfurylase synthesizes ATP, apyrase degrades unincorporated substrates. The distinct role of luciferase is generating photons that enable real-time identification of incorporated nucleotides.

Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.

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Blotting Techniques

Which tag allows bioluminescent detection?

Bioluminescent tagging employs luciferase enzymes that generate photons through substrate oxidation without requiring external illumination, thereby avoiding autofluorescence and photobleaching. Firefly luciferase uses D-luciferin, ATP, magnesium, and molecular oxygen to produce light near 560 nm. In blotting context, target protein fused to luciferase or detected by luciferase-conjugated secondary antibody emits light captured by sensitive detectors. Alkaline phosphatase with BCIP/NBT and horseradish peroxidase with TMB produce colorimetric precipitates, while green fluorescent protein requires excitation by blue light to fluoresce. Luciferase therefore provides true bioluminescent detection with high sensitivity.

Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.

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Flow cytometry, FACS, ELISA

Luciferin used with luciferase results in:

Luciferase enzyme from fireflies and marine organisms catalyzes oxidation of substrate luciferin in ATP and oxygen dependent reaction. Energy released does not produce color change but photon emission in visible range, termed bioluminescence. No external excitation light is needed, unlike fluorescence of GFP which requires light source. Reaction produces low background and high sensitivity detection used in reporter assays, ATP quantification and immunoassays. Green fluorescence would require fluorophore excitation, while luciferin luciferase system generates intrinsic light production measurable by luminometer for quantitative biology.

Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.

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