Interstrain variation of murine arylsulfatase C

Area of Science:

• Biochemistry
• Genetics
• Enzymology

Background:

• Arylsulfatases are crucial enzymes involved in various biological processes.
• Understanding the genetic and developmental regulation of arylsulfatase C is important.
• Existing assays may not adequately differentiate between different arylsulfatase isozymes.

Purpose of the Study:

• To develop and validate a specific assay for arylsulfatase C (ASC) in complex tissue extracts.
• To investigate the natural variation in ASC activity across different inbred murine strains.
• To characterize the biochemical properties of ASC in high- and low-activity strains.

Main Methods:

• Development of a selective assay for ASC in the presence of ASC and ASB.
• Assay of ASC activity in tissue extracts from 26 inbred murine strains.
• Analysis of ASC activity at various postnatal ages (1-70 days).
• Biochemical characterization including Michaelis constants, optima, stability, and inhibitor profiles.

Main Results:

• A reliable method for ASC assay was established.
• Significant inter-strain variations in ASC activity were observed.
• Activity differences were consistent across postnatal development.
• Kinetic and stability profiles of ASC were similar between high- and low-activity strains, suggesting regulatory differences.

Conclusions:

• The developed assay allows for precise measurement of ASC activity.
• Genetic background significantly influences ASC activity levels in mice.
• The observed variations are likely due to regulatory mechanisms rather than altered enzyme structure or function.