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Iron hydrogenases--ancient enzymes in modern eukaryotes
David S Horner1, Burkhard Heil, Thomas Happe
1Dipartimento di Fisiologia e Biochimica Generali, University of Milan, via Celoria 26, 20133, Milan, Italy.
Trends in Biochemical Sciences
|March 15, 2002
Summary
[Fe]-hydrogenases are widespread in eukaryotes, not just bacteria. Their functions and roles in eukaryotic cell evolution are now areas of intense scientific interest and investigation.
Area of Science:
- Biochemistry
- Molecular Biology
- Evolutionary Biology
Background:
- Historically, [Fe]-hydrogenase distribution was believed to be limited to specific bacteria and anaerobic eukaryotes.
- Recent genomic studies reveal a much broader presence of [Fe]-hydrogenase genes across diverse eukaryotic lineages.
Purpose of the Study:
- To summarize current knowledge on the distribution, evolution, and biochemistry of [Fe]-hydrogenases in eukaryotes.
- To highlight the emerging understanding of these enzymes beyond their known hydrogen production capabilities.
Main Methods:
- Genomic analysis to identify [Fe]-hydrogenase gene signatures across eukaryotic genomes.
- Comparative analysis of gene distribution and sequence homology.
- Review of existing literature on hydrogenase biochemistry and function.
Main Results:
- [Fe]-hydrogenase genes are present in a wider range of eukaryotes than previously recognized, including higher eukaryotes.
- The functions of many newly identified eukaryotic [Fe]-hydrogenases remain largely unknown.
- Hypotheses suggest a significant role for hydrogenases in early eukaryotic cell evolution.
Conclusions:
- The distribution and potential functions of [Fe]-hydrogenases in eukaryotes are significantly underestimated.
- These enzymes represent a key area for future research in eukaryotic biology and evolution.
- Further investigation is needed to elucidate the biochemical activities and evolutionary significance of these widespread enzymes.