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[Different forms of pyruvate kinase from the rabbit adrenal cortex]
Biokhimiia (Moscow, Russia)
|September 1, 1975
Summary
Researchers isolated pyruvate kinase (PK) isoenzymes using fractionation and chromatography. Two distinct PK isoenzymes were identified, with one resembling L-type PK and others potentially being variants of the K(M2) type.
Area of Science:
- Biochemistry
- Enzymology
Context:
- Pyruvate kinase (PK) plays a crucial role in glycolysis.
- Understanding PK isoenzyme properties is vital for metabolic research.
Purpose:
- To isolate and characterize pyruvate kinase (PK) isoenzymes.
- To differentiate PK isoenzymes based on their kinetic and effector properties.
Summary:
- Pyruvate kinase (PK) isoenzymes were isolated via ammonium sulfate fractionation and DEAE-cellulose chromatography.
- Two activity peaks (I and II) were found in the 20-45% saturation fraction, and one peak (I-A) in the 50-70% saturation fraction.
- PK-II exhibits properties similar to L-type PK, while PK-I and PK-I-A show S-form kinetics for phosphoenolpyruvate (PEP) and are inhibited by L-alanine and phenylalanine, suggesting they are variants of the K(M2) type.
Impact:
- This study contributes to the detailed characterization of pyruvate kinase isoenzymes.
- The findings aid in understanding metabolic regulation and potential disease mechanisms related to PK dysfunction.