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4-Hydroxy-2-pyrone formation by chalcone and stilbene synthase with nonphysiological substrates
K W Zuurbier1, J Leser, T Berger
1Institut für Biologie II, Universität Freiburg, Germany.
Phytochemistry
|January 12, 1999
Summary
Chalcone synthase can function as valerophenone synthase (VPS) in hop bitter acid synthesis, though imperfectly. This suggests functional diversity and evolution within CHS-related polyketide synthases.
Area of Science:
- Biochemistry
- Plant Science
- Enzymology
Background:
- Valerophenone synthase (VPS) synthesizes phloroglucinol derivatives for hop bitter acids.
- VPS activity is similar to chalcone synthase (CHS) in flavonoid biosynthesis.
Purpose of the Study:
- Investigate if chalcone synthase can substitute for valerophenone synthase.
- Explore functional diversity and evolution of CHS-related polyketide synthases.
Main Methods:
- Enzymatic assays using chalcone synthase and stilbene synthase.
- Analysis of reaction products from hop (Humulus lupulus) biosynthesis.
Main Results:
- Chalcone synthase partially catalyzed VPS reactions, primarily yielding 4-hydroxy-2-pyrone derivatives.
- Stilbene synthase exclusively produced 4-hydroxy-2-pyrone derivatives.
Conclusions:
- Chalcone synthase exhibits functional overlap with valerophenone synthase.
- Enzyme promiscuity and evolutionary divergence are key in CHS-related polyketide synthases.