Báo cáo khoa học: The N-acetylglutamate synthase/N-acetylglutamate kinase metabolon of Saccharomyces cerevisiae allows co-ordinated feedback regulation of the first two steps in arginine biosynthesis

The N-acetylglutamate synthase/N-acetylglutamate kinase metabolon of Saccharomyces cerevisiae allows co-ordinated feedback regulation of the first two steps in arginine biosynthesis

Authors: Katia Pauwels, Agnes Abadjieva, Pierre Hilven, Anna Stankiewicz and Marjolaine Crabeel

Field: Genetics and Microbiology

Document Content: This study investigates the N-acetylglutamate synthase (NAGS) and N-acetylglutamate kinase (NAGK) metabolon in Saccharomyces cerevisiae, focusing on their interaction and co-ordinated feedback regulation of arginine biosynthesis. The research demonstrates that the reductase is not essential for synthase activity and protein levels. A key finding is the mutual interdependence of arginine feedback regulation between NAGS and NAGK. The study explores the role of the ascomycete-specific domain of NAGK in maintaining synthase activity and protein stability, and investigates the impact of a feedback-resistant kinase mutant on synthase regulation. The findings suggest a mechanism for co-ordinated feedback regulation of the initial steps in arginine biosynthesis.

Detailed Table of Contents:

• Introduction to arginine biosynthesis and the role of NAGS and NAGK.
• The ascomycete-specific domain of NAGK and its role in the metabolon.
• The dispensability of N-acetylglutamylphosphate reductase for synthase activity.
• Interdependence of arginine feedback regulation between NAGS and NAGK.
• Co-ordinated feedback regulation of the first two enzymes in arginine biosynthesis.
• Experimental procedures, including strains, growth conditions, and methodologies.
• Results detailing enzyme activity assays, Western blots, and physiological observations.
• Discussion of findings and their implications for understanding metabolic regulation.
• References and acknowledgements.