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Updated: Jun 30, 2026
07:13
Quantification of Violacein in Chromobacterium violaceum and Its Inhibition by Bioactive Compounds
Published on: August 8, 2025
Cellulose biosynthesis by the beta-proteobacterium, Chromobacterium violaceum
Derce O S Recouvreux1, Claudimir A Carminatti, Ana K Pitlovanciv
1Genomic Engineering Group, Integrated Technologies Laboratory, Chemical and Food Engineering Department, Federal University of Santa Catarina, Florianópolis, SC, 88040-900, Brazil. dercer@intelab.ufsc.br
Current Microbiology
|September 30, 2008
Summary
Chromobacterium violaceum produces cellulose, a key component of its extracellular biofilm matrix. This study provides the first experimental evidence of cellulose production in beta-proteobacteria.
Area of Science:
- Microbiology
- Bacterial Genetics
- Biochemistry
Background:
- The Chromobacterium violaceum ATCC 12472 genome contains genes for cellulose biosynthesis.
- These genes are organized into two operons, similar to other bacteria.
Purpose of the Study:
- To provide experimental evidence for cellulose production in Chromobacterium violaceum.
- To characterize the extracellular matrix of C. violaceum biofilms.
Main Methods:
- Enzymatic digestion of biofilms with cellulase.
- Fluorescence microscopy using calcofluor.
- Growth on Congo red medium.
- Scanning electron microscopy (SEM).
Main Results:
- Cellulase digestion released glucose units, indicating cellulose presence.
- The extracellular matrix was cellulase-sensitive, fibrous, and bound calcofluor.
- SEM revealed a microfibrillar network characteristic of bacterial cellulose.
- C. violaceum formed brown-red colonies on Congo red agar.
Conclusions:
- Experimental evidence confirms cellulose as a component of the C. violaceum extracellular matrix.
- This study provides the first experimental proof of cellulose production in beta-proteobacteria.
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