Related Experiment Video
Updated: Jun 19, 2026
13:26
Determination of Protein-ligand Interactions Using Differential Scanning Fluorimetry
Published on: September 13, 2014
CRYSTALLINE HEXOKINASE (HETEROPHOSPHATESE) : METHOD OF ISOLATION AND PROPERTIES
1Laboratories of The Rockefeller Institute for Medical Research, Princeton, New Jersey.
The Journal of General Physiology
|October 30, 2009
Summary
Researchers isolated crystalline hexokinase, a protein crucial for yeast metabolism. This protein has a molecular weight of 96,000 and an isoelectric point of pH 4.8, requiring magnesium ions for activity.
Area of Science:
- Biochemistry
- Enzymology
- Protein Chemistry
Background:
- Hexokinase is a key enzyme in glycolysis.
- Understanding hexokinase's properties is vital for metabolic studies.
- Previous isolation methods were less efficient or yielded impure products.
Purpose of the Study:
- To isolate and characterize crystalline hexokinase from baker's yeast.
- To determine the physicochemical properties of purified hexokinase.
- To establish a stable and active form of the enzyme for further research.
Main Methods:
- Fractional precipitation using ammonium sulfate and alcohol.
- Crystallization at approximately 5 degrees C in ammonium sulfate and phosphate buffer (pH 7.0).
- Purity assessment via solubility, ultracentrifugation, and electrophoresis.
Main Results:
- Successfully isolated crystalline hexokinase with an albumin-type protein nature.
- Determined molecular weight of 96,000 and isoelectric point of pH 4.8.
- Enzymatic activity remained constant through multiple recrystallizations; enzyme requires magnesium ions.
Conclusions:
- Crystalline hexokinase is a stable, pure enzyme preparation.
- The isolation method yields a consistent and active enzyme.
- Further investigation into associated crystalline proteins is warranted.
