Spontaneous spatiotemporal organization in yeast extracts

Area of Science:

• Biochemistry
• Cell Biology
• Systems Biology

Background:

• Cytoplasmic extracts from Saccharomyces uvarum yeast can exhibit dynamic metabolic behavior.
• Addition of trehalose triggers oscillations in metabolite concentrations within stirred extracts.
• Unstirred extracts may spontaneously develop complex spatial patterns.

Purpose of the Study:

• To investigate the existence and nature of spatiotemporal patterns in unstirred yeast extracts.
• To characterize the observed patterns using optical absorption of NADH.
• To explore the implications of these patterns for understanding biochemical morphogenesis.

Main Methods:

• Utilized stirred cytoplasmic extracts of Saccharomyces uvarum.
• Introduced trehalose to induce metabolic oscillations.
• Employed an annular cuvette rotated in a photometer to record NADH optical absorption.
• Analyzed recorded data for spatiotemporal structures.

Main Results:

• Confirmed the presence of spatiotemporal patterns in unstirred yeast extracts.
• Observed regularly spaced, wavelike spatiotemporal standing waves in metabolite concentrations.
• Identified fixed points with constant NADH concentration within the observed patterns.

Conclusions:

• Spatiotemporal patterns, including standing waves, exist in yeast extracts.
• These patterns are linked to metabolite concentration dynamics and NADH absorption.
• The findings contribute to understanding the principles of biochemical morphogenesis and self-organization in biological systems.