And then there were two.

Area of Science:

• Biochemistry
• Molecular Biology
• Enzymology

Background:

• Lysine acetylation is a crucial post-translational modification regulating protein function in various organisms.
• While several lysine deacetylases are known, the enzymatic landscape in bacteria like E. coli remains incompletely characterized.

Purpose of the Study:

• To identify and characterize novel enzymes involved in lysine deacetylation in Escherichia coli (E. coli).
• To establish the enzymatic activity and evolutionary significance of the newly discovered enzyme.

Main Methods:

• Proteomic analysis to identify potential deacetylation targets.
• Enzyme assays to confirm catalytic activity on acetylated lysine residues.
• Bioinformatic analysis to determine evolutionary relationships and family classification.

Main Results:

• Discovery of a novel enzyme catalyzing the removal of acetyl groups from lysine residues in E. coli.
• This enzyme is identified as the first member of a previously unrecognized enzyme family.
• The enzyme exhibits specific activity towards acetylated lysine, suggesting a regulatory role in bacterial physiology.

Conclusions:

• The identification of this new enzyme expands the known repertoire of lysine deacetylation mechanisms in bacteria.
• This discovery opens new avenues for research into the regulation of protein function via acetylation/deacetylation in E. coli and related species.
• The establishment of a new enzyme family highlights the unexplored enzymatic diversity within microbial proteomes.