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Updated: Jan 29, 2026
07:36
Autofluorescence Imaging to Evaluate Cellular Metabolism
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Cyclic-FMN Is a Detectable, Putative Intermediate of FAD Metabolism.
Luxene Belfleur1, Juha P Kallio2, Wito Richter3
1Mitchell Cancer Institute, Mass Spectrometry Core Facility, University of South Alabama, Mobile, AL 36604, USA.
Biomolecules
|January 28, 2026
Summary
Researchers synthesized 4
Area of Science:
- Biochemistry
- Analytical Chemistry
Background:
- Free flavin adenine dinucleotide (FAD) metabolism yields flavin mononucleotide (FMN) and adenine monophosphate (AMP).
- Triose kinase FMN cyclase (TKFC) converts FAD to 4',5'-cyclic phosphoriboflavin (cFMN) and AMP.
- Underreporting of cFMN incidence in biological samples may stem from a lack of analytical standards.
Purpose of the Study:
- To synthesize cFMN to establish it as an analytical standard.
- To optimize reaction conditions for efficient cFMN synthesis from FAD.
- To characterize the stability and extraction properties of cFMN for biological sample analysis.
Main Methods:
- Synthesis of cFMN from FMN or FAD.
- Optimization of FAD to cFMN conversion using ZnSO4.
- Analysis of cFMN stability under varying pH conditions.
- Extraction of cFMN from biological samples for LC-MS detection.
Main Results:
- Optimized reaction conditions using an equimolar ratio of ZnSO4 and FAD yielded pure cFMN.
- AMP-Zn salts precipitated, facilitating cFMN purification.
- cFMN demonstrated stability in acidic and basic aqueous conditions.
- cFMN is readily extracted from biological matrices.
- Hydrolysis of cFMN to FMN and riboflavin by liver extracts was observed, but mechanisms remain unclear.
Conclusions:
- A reliable method for synthesizing pure cFMN was established.
- The developed method enables accurate quantification of cFMN in biological samples.
- Further research is needed to elucidate the enzymatic pathways of cFMN hydrolysis in liver tissue.
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