Changes of a high molecular mass proteinase activity during Bufo bufo development

Area of Science:

• Developmental Biology
• Biochemistry
• Enzymology

Background:

• Proteolytic enzymes play crucial roles in embryonic development.
• Understanding the specific proteases involved in amphibian development is essential for deciphering developmental processes.

Purpose of the Study:

• To investigate the presence and characteristics of chymotrypsin-like proteolytic activity during the embryonic development of Bufo bufo.
• To determine the molecular properties and regulatory factors of this activity throughout development.

Main Methods:

• Assay of chymotrypsin-like proteolytic activity in unfertilized eggs and embryos at various developmental stages.
• Gel chromatography to determine the molecular mass of the active proteinase.
• Characterization of the enzyme's properties using substrate specificity, protease inhibitors, and pH effects.

Main Results:

• Chymotrypsin-like proteolytic activity was detected in both unfertilized eggs and developing embryos of Bufo bufo.
• A significant increase in activity was observed post-fertilization, peaking around stage 9, followed by a decrease.
• Gel chromatography indicated a single proteinase activity peak with very high molecular mass across all developmental stages.

Conclusions:

• The observed chymotrypsin-like activity in Bufo bufo embryos is associated with a high molecular mass multicatalytic proteinase.
• The dynamic changes in this enzyme's activity during embryonic development suggest a critical role in developmental processes.
• Further characterization supports the assignment of this activity to a multicatalytic proteinase.