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Published on: September 20, 2016
Sulfohydrolase Activity and Carrageenan Biosynthesis in Chondrus crispus (Rhodophyceae)
1Atlantic Regional Laboratory, National Research Council of Canada, Halifax, Nova Scotia B3H 3Z1.
Plant Physiology
|April 1, 1978
Summary
Researchers discovered an enzyme in Chondrus crispus that converts mu- to kappa-carrageenan. This enzyme releases sulfate and is crucial for understanding carrageenan biosynthesis.
Area of Science:
- Marine Biology
- Biochemistry
- Phycology
Background:
- Carrageenans are sulfated polysaccharides found in red algae.
- Understanding carrageenan biosynthesis is key to its applications.
Purpose of the Study:
- To identify and characterize the enzyme responsible for converting mu-carrageenan to kappa-carrageenan in Chondrus crispus.
- To investigate the enzyme's properties and its role in carrageenan biosynthesis.
Main Methods:
- Enzyme extraction and partial purification from Chondrus crispus and Gigartina stellata.
- Enzyme activity assays measuring sulfate release.
- Characterization of enzyme properties including pH optimum and inhibitors.
Main Results:
- Demonstrated an enzyme catalyzing mu- to kappa-carrageenan conversion in Chondrus crispus.
- The enzyme acts on the polymer level, releasing sulfate and producing 3,6-anhydro-d-galactose.
- Enzyme properties were characterized, including pH optimum (6.5) and inhibition by various substances.
- A comparable enzyme with higher activity was found in Gigartina stellata.
Conclusions:
- The identified sulfohydrolase enzyme plays a critical role in carrageenan biosynthesis.
- The enzyme's action confirms that kappa-carrageenan-resistant fractions are biosynthetically incomplete mu-carrageenan.
- Further research on this enzyme can elucidate carrageenan production pathways.
