Radical AdoMet enzymes in complex metal cluster biosynthesis

Area of Science:

• Biochemistry
• Enzymology
• Bioinorganic Chemistry

Background:

• Radical S-adenosylmethionine (AdoMet) enzymes are a large protein superfamily.
• They generate a 5'-deoxyadenosyl radical intermediate for biochemical transformations.
• Recent studies highlight their role in synthesizing unique iron-sulfur (FeS) cofactors.

Purpose of the Study:

• To explore the novel roles of radical AdoMet enzymes in the biosynthesis of complex inorganic cofactors.
• To investigate how these enzymes modify FeS precursors into unique clusters.
• To understand the evolutionary implications of radical AdoMet enzymes in creating bioinorganic catalysts.

Main Methods:

• Investigating the biosynthesis pathways of FeS cofactors like H-cluster, FeMo-co, and FeGP.
• Analyzing the mechanisms of radical AdoMet enzymes in conjunction with scaffold proteins.
• Studying amino acid decomposition and sulfur insertion reactions involved in cofactor modification.

Main Results:

• Radical AdoMet enzymes are implicated in the biosynthesis of unique FeS-containing cofactors.
• These enzymes, with scaffold proteins, modify common FeS precursors into unique clusters.
• Novel amino acid decomposition and sulfur insertion reactions are employed in this process.

Conclusions:

• Radical AdoMet enzymes play a significant role in generating complex inorganic cofactors.
• Their ability to modify metal centers provides insights into the evolution of bioinorganic catalysts.
• This research contributes to the understanding of radical enzymology and radical SAM enzymes.