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Arylamidases in normal and diseased human muscle
Summary
Human skeletal muscle contains arylamidase enzymes that break down specific amino acid substrates. These enzymes showed no significant activity differences in patients with muscular dystrophies or denervating diseases.
Area of Science:
- Biochemistry
- Enzymology
- Human Physiology
Background:
- Human skeletal muscle possesses enzymes crucial for protein metabolism.
- Arylamidases are a class of enzymes involved in hydrolyzing peptide bonds.
Purpose of the Study:
- To characterize the arylamidase activities in human skeletal muscle.
- To investigate potential alterations in muscle arylamidase activity in neuromuscular diseases.
Main Methods:
- Analysis of human skeletal muscle homogenates.
- Assay of enzyme activity using specific beta-naphthylamide substrates.
- Assessment of enzyme inhibition and activation by various agents.
Main Results:
- Identified enzymes hydrolyzing leucine, arginine, and lysine beta-naphthylamides.
- Detected trace activity towards alpha-aspartyl-beta-naphthylamide.
- Observed inhibition by p-chloromercuribenzoate, Hg2+, and puromycin; slight activation by cobalt ions.
- Found no significant differences in muscle arylamidase activities in patients with muscular dystrophies or denervating diseases compared to controls.
Conclusions:
- Human skeletal muscle contains neutral and basic arylamidases with specific substrate preferences.
- Muscle arylamidase activity is modulated by certain ions and inhibitors.
- These enzyme activities do not appear to be significantly altered in common muscular dystrophies and denervating diseases.