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[Purification and properties of glutamate dehydrogenase from Pseudomonas pseudoalcaligenes]
Wei Sheng Wu Xue Bao = Acta Microbiologica Sinica
|January 31, 2003
Abstract:
Glutamate dehydrogenase was purified from the crude extract of Pseudomonas pseudoal-caligenes. The enzyme had a molecular weight of 290,000 and was composed of six subunits with identical molecular weight of 47,000. The enzyme was highly specific for NADP(H) and the substrates. The biochemical properties such as kinetic parameters and heat stability were also examined. The purified GDH showed considerable loss of activity upon freezing.
Insights
Researchers purified glutamate dehydrogenase (GDH) from Pseudomonas pseudoalcaligenes, finding it specific for NADP(H) and substrates. The enzyme, composed of six subunits, lost activity when frozen.
Area of Science:
- Biochemistry
- Enzymology
- Microbial Physiology
Context:
- Investigating enzymes in microbial systems.
- Understanding metabolic pathways in Pseudomonas species.
Purpose:
- To purify and characterize glutamate dehydrogenase (GDH) from Pseudomonas pseudoalcaligenes.
- To determine the enzyme's molecular properties, substrate specificity, and stability.
Summary:
- Glutamate dehydrogenase (GDH) was successfully purified from Pseudomonas pseudoalcaligenes.
- The purified enzyme exhibits a molecular weight of 290,000 Da, comprising six identical subunits of 47,000 Da each.
- GDH demonstrated high specificity for NADP(H) and its substrates, with kinetic parameters and heat stability analyzed. A significant loss of activity was observed upon freezing.
Impact:
- Provides insights into the structure-function relationship of GDH in Pseudomonas.
- Characterization data can inform future studies on microbial metabolism and enzyme engineering.
- Understanding enzyme stability is crucial for biotechnological applications and storage.