Biotin carboxylase comes into the fold

Area of Science:

• Biochemistry and structural biology
• Enzymology
• Evolutionary biology

Background:

• Biotin carboxylase (BC) and ADP-forming peptide synthetases (PSs) are crucial enzymes in distinct metabolic pathways.
• While functionally diverse, their structural and mechanistic relationships have not been fully elucidated.
• Understanding these relationships can provide insights into enzyme evolution and function.

Discussion:

• Extensive three-dimensional structural resemblances were identified between biotin carboxylase and representative ADP-forming peptide synthetases, including glutathione synthetase and D-Ala:D-Ala ligase.
• These structural parallels suggest a shared evolutionary origin for these enzyme superfamilies.
• The findings challenge previous classifications and highlight an unsuspected evolutionary relationship.

Key Insights:

• A conserved structural architecture exists between biotin carboxylase and ADP-forming peptide synthetases.
• This structural homology indicates a common ancestor, linking previously disparate enzyme families.
• The study reveals a previously unrecognized evolutionary connection within the broader class of ATP-dependent ligases.

Outlook:

• Further structural and functional studies can refine our understanding of the evolutionary trajectory of these ligases.
• Investigating other members of these enzyme families may reveal additional evolutionary links.
• This discovery opens new avenues for enzyme engineering and drug development targeting these pathways.