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Improved enzyme screening by automated fast protein liquid chromatography
Analytical Biochemistry
|December 1, 1985
Summary
This study presents an automated chromatography method to overcome non-specific reactions in enzyme assays for NADH-dependent dehydrogenases. The technique effectively purifies 2-hydroxyisocaproate dehydrogenase, reducing assay interference and improving enzyme screening.
Area of Science:
- Biochemistry
- Enzymology
- Analytical Chemistry
Background:
- NADH-dependent dehydrogenase assays in crude extracts are often affected by non-specific reactions, leading to high blank values.
- This interference hampers accurate enzyme screening and characterization.
Purpose of the Study:
- To develop an automated chromatography method to resolve interference issues in enzyme screening for NADH-dependent dehydrogenases.
- To specifically purify 2-hydroxyisocaproate dehydrogenase and lactate dehydrogenase from crude extracts.
Main Methods:
- Utilized fast protein liquid chromatography (FPLC) combining gel filtration and ion-exchange chromatography.
- Developed an automated two-column purification cycle taking approximately 35 minutes, including equilibration and regeneration.
Main Results:
- Successfully separated 2-hydroxyisocaproate dehydrogenase from interfering NADH-oxidase activity and lactate dehydrogenase.
- Achieved up to 20-fold purification of the target enzymes.
- Significantly reduced blank values caused by side reactions.
Conclusions:
- The automated FPLC method effectively eliminates interfering activities in enzyme assays.
- This procedure enhances the reliability and efficiency of screening for NADH-dependent dehydrogenases like 2-hydroxyisocaproate dehydrogenase.