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Updated: Jul 31, 2026
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Fiber Type and Subcellular-Specific Analysis of Lipid Droplet Content in Skeletal Muscle
Published on: June 8, 2022
Summary
Glycerokinase activity was found in human fat tissue, with optimal conditions at pH 7.6-9.0. Enzyme activity was low and not linked to obesity or cell size.
Area of Science:
- Biochemistry
- Human Physiology
- Adipose Tissue Metabolism
Background:
- Glycerokinase is a key enzyme in triglyceride synthesis.
- Its presence and activity in human adipose tissue are not fully characterized.
Purpose of the Study:
- To investigate the presence and kinetic properties of glycerokinase in human adipose tissue.
- To determine if glycerokinase activity correlates with obesity or adipose cell size.
Main Methods:
- Enzyme assays were performed on human omental and subcutaneous adipose tissue.
- Kinetic parameters, including Km and Vmax, were determined.
- Enzyme activity was correlated with patient obesity and adipose cell size.
Main Results:
- Glycerokinase was detected in human adipose tissue.
- Optimal activity was observed at pH 7.6 and 9.0, with saturation at 1.8 mM ATP and 0.4 mM glycerol.
- Apparent Km values for ATP were 0.094 and 0.518 mM, and for glycerol was 0.112 mM.
- Enzyme activity was low and showed no correlation with adipose cell size or obesity.
Conclusions:
- Human adipose tissue possesses glycerokinase activity.
- The enzyme's kinetic properties were elucidated.
- Glycerokinase activity in adipose tissue is independent of obesity and adipose cell size.
