Metabolite Damage and Damage Control in a Minimal Genome

Area of Science:

• Biochemistry
• Genomics
• Metabolomics

Background:

• Metabolite damage and repair mechanisms are critical for cellular integrity.
• Understanding these systems is vital, especially in minimal life forms.

Purpose of the Study:

• To identify essential metabolite damage control systems in the minimized Mycoplasma JCVI-Syn3A genome.
• To elucidate novel functions of enzymes involved in metabolite repair and nucleotide pool sanitation.
• To map the metabolic network, including damage and repair reactions.

Main Methods:

• Genomic analysis of the JCVI-Syn3A core genome.
• Experimental validation of gene functions.
• Metabolomic profiling and cheminformatics analysis.

Main Results:

• Essentiality of metabolite repair systems confirmed in a minimal genome.
• Identified 5-formyltetrahydrofolate cycloligase, CoA disulfide reductase, and hydrolases as key repair enzymes.
• Discovered a novel proofreading function for a YqeK hydrolase domain fused to NadD, acting as a nucleotide pool sanitizing enzyme.
• Extended the metabolic map, revealing uncharacterized damage control systems like methylglyoxal repair.

Conclusions:

• Metabolite damage and repair are fundamental, inseparable processes of life.
• Minimal genomes retain essential damage control systems, highlighting their universal importance.
• A complex network of metabolite damage and control reactions exists, with many systems yet to be fully characterized.