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Catalytic activity of ADAM28
L Howard1, Y Zheng, M Horrocks
1Cellular Biochemistry and Biophysics Program, Sloan-Kettering Institute, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA.
FEBS Letters
|June 8, 2001
Summary
Researchers found catalytic activity in ADAM28, a protein important in sperm maturation and lymphocyte function. This discovery advances understanding of ADAM metalloproteinases in health and disease.
Area of Science:
- Biochemistry
- Molecular Biology
- Cell Biology
Background:
- ADAMs (a disintegrin and metalloprotease domain) are membrane proteins involved in fertilization, development, and diseases like Alzheimer's.
- ADAM28 is notably expressed in the epididymis and lymphocytes, suggesting specific physiological roles.
Purpose of the Study:
- To investigate the catalytic activity of ADAM28.
- To characterize the enzymatic properties and potential inhibitors of ADAM28.
Main Methods:
- Expression and purification of recombinant ADAM28.
- Enzymatic assays using myelin basic protein as a substrate.
- Testing the sensitivity of ADAM28 activity to metalloprotease inhibitors and site-directed mutagenesis.
Main Results:
- The study provides the first evidence for the catalytic activity of ADAM28.
- Recombinant ADAM28 was shown to cleave myelin basic protein at two distinct sites.
- ADAM28 activity was resistant to tissue inhibitors of metalloproteases 1 and 2 (TIMPs) but could be abolished by mutating the catalytic site.
Conclusions:
- ADAM28 possesses intrinsic metalloprotease activity.
- The enzyme's resistance to common inhibitors and its substrate specificity offer insights into its biological functions.
- Catalytically active ADAM28 is a valuable tool for future research into sperm maturation and lymphocyte function.