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Water-dependent reaction pathways: an essential factor for the catalysis in HEPD enzyme
Likai Du1, Jun Gao, Yongjun Liu
1Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Institute of Theoretical Chemistry, School of Chemistry & Chemical Engineering, Shandong University, Jinan, 250100, PR China.
Water molecules are crucial biological catalysts in the hydroxyethylphosphonate dioxygenase (HEPD) enzyme. They act as an oxygen source and protect the enzyme from damage, aiding phosphinothricin biosynthesis.
Area of Science:
- Biochemistry
- Enzymology
- Bioinorganic Chemistry
Background:
- Hydroxyethylphosphonate dioxygenase (HEPD) is key in phosphinothricin biosynthesis.
- HEPD catalyzes critical carbon-carbon bond cleavage.
- Experimental data suggests water's significant role in HEPD catalysis.
Purpose of the Study:
- To propose a reaction mechanism involving water in HEPD catalysis.
- To elucidate the role of water in generating iron-oxo complexes.
- To understand water's protective function and oxygen incorporation.
Main Methods:
- Computational modeling of reaction mechanisms.
- Analysis of water molecule properties within the enzyme.
- Interpretation of O(18) labeling experiments.
Main Results:
- A novel mechanism where water acts as an oxygen source for nonheme iron oxo complexes is proposed.
- Water participates in the catalytic cycle prior to C-C bond cleavage.
- Water converts reactive hydroxyl radicals to ferric hydroxide, protecting the enzyme.
Conclusions:
- Water molecules function as biological catalysts in HEPD, similar to P450 enzymes.
- This mechanism explains water's role in O(18) incorporation during HMP synthesis.
- Understanding water-enzyme interactions offers insights into enzymatic catalysis and protection.
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