Highly sensitive assay for PZ-peptidase activity by high-performance liquid chromatography
Journal of Chromatography
|November 27, 1985
Summary
A new assay method accurately measures PZ-peptidase activity in newborn rat brains. This sensitive technique detected PZ-peptidase in mouse osteoblastic cells, advancing enzyme research.
Area of Science:
- Biochemistry
- Enzymology
- Cell Biology
Background:
- PZ-peptidase is an enzyme implicated in various biological processes.
- Accurate measurement of PZ-peptidase activity is crucial for understanding its function.
- Existing methods may lack the sensitivity or speed required for certain applications.
Purpose of the Study:
- To develop a rapid and highly sensitive assay for quantifying PZ-peptidase activity.
- To validate the assay's performance using newborn rat brain tissue.
- To explore the presence of PZ-peptidase activity in other cell types.
Main Methods:
- Enzyme assay utilizing a specific substrate (PZ-L-Pro-L-Leu-Gly-L-Pro-D-Arg).
- High-performance liquid chromatography (HPLC) with reversed-phase separation.
- Spectrophotometric detection of the product (PZ-Pro-Leu) at 320 nm.
Main Results:
- The developed assay is highly sensitive, detecting PZ-Pro-Leu at concentrations as low as 5 pmol.
- The method allows for rapid analysis, with column re-equilibration in under 10 minutes.
- PZ-peptidase activity was successfully identified in clonal osteoblastic cells from newborn mouse calvaria.
Conclusions:
- A novel, sensitive, and rapid HPLC-based assay for PZ-peptidase activity has been established.
- This assay is suitable for analyzing enzyme activity in biological samples, including cell cultures.
- The discovery of PZ-peptidase in osteoblastic cells opens new avenues for research into bone biology and related disorders.
