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Metalloenzymes and iron-sulfur proteins
Research Guide
What is Metalloenzymes and iron-sulfur proteins?
Metalloenzymes and iron-sulfur proteins are enzymes containing metal centers, particularly iron-sulfur clusters, that catalyze biological processes such as hydrogen evolution, nitrogen fixation, and electron transfer in systems ranging from hydrogenases to mitochondrial biogenesis.
This field encompasses 35,176 works on the occurrence, classification, and function of hydrogenases and iron-sulfur clusters in processes like nitrogen fixation and molecular catalysis for hydrogen production. Iron-sulfur clusters, including Fe₂S₂, Fe₃S₄, and Fe₄S₄ types, serve modular roles in oxidation-reduction reactions and protein structure across all life forms, as detailed in 'Iron-Sulfur Clusters: Nature's Modular, Multipurpose Structures' (1997). Hydrogenases, key enzymes in this area, feature iron-only active sites whose structures enable efficient H₂ production and oxidation, exemplified by the 1.8 Å resolution X-ray structure in 'X-ray Crystal Structure of the Fe-Only Hydrogenase (CpI) from Clostridium pasteurianum to 1.8 Angstrom Resolution' (1998).
Topic Hierarchy
Research Sub-Topics
Fe-Only Hydrogenases
This sub-topic examines the structure, catalytic mechanisms, and electron transfer pathways of [FeFe]-hydrogenases found in anaerobic bacteria and algae. Researchers investigate X-ray crystallography, spectroscopic characterization, and synthetic mimics of their H-cluster active sites.
Iron-Sulfur Cluster Biosynthesis
This area focuses on the assembly machineries like ISC and SUF systems in mitochondria and bacteria, including scaffold proteins and trafficking mechanisms. Studies explore genetic regulation and implications for diseases linked to cluster defects.
NiFe Hydrogenases
Research covers the structural diversity, maturation processes involving nickel insertion, and oxygen tolerance of [NiFe]-hydrogenases in diverse microorganisms. Key efforts include redox-dependent activation and genetic engineering for biotechnological use.
Molybdenum Nitrogenase
This sub-topic investigates the FeMo-cofactor mechanism, substrate reduction pathways, and cryo-EM structures of nitrogenase enzymes responsible for biological N2 fixation. Researchers study P-cluster intermediates and alternative nitrogenases.
Biomimetic Iron-Sulfur Catalysts
Scientists develop synthetic models mimicking iron-sulfur clusters for electrocatalytic hydrogen evolution and multi-electron transfer reactions. Work includes ligand design, cluster stability, and integration into nanomaterials.
Why It Matters
Metalloenzymes and iron-sulfur proteins drive renewable energy applications through biomimetic catalysts that mimic natural hydrogen production. 'Biomimetic Hydrogen Evolution: MoS₂ Nanoparticles as Catalyst for Hydrogen Evolution' (2005) by Hinnemann et al. demonstrates MoS₂ nanoparticles achieving Pt-like efficiency for electrochemical hydrogen evolution, addressing the scarcity of platinum-group metals for H₂ as a future energy carrier. Hydrogenases enable molecular catalysis in photosynthetic systems and electrocatalytic H₂ production, with structures like the Fe-only hydrogenase from Clostridium pasteurianum revealing active sites for two-electron H₂ reduction, as solved by Peters (1998). Nitrogenase mechanisms involving iron-sulfur clusters and molybdenum cofactors support agricultural nitrogen fixation, detailed in 'Mechanism of Molybdenum Nitrogenase' (1996) by Burgess and Lowe, reducing reliance on synthetic fertilizers.
Reading Guide
Where to Start
'Iron-Sulfur Clusters: Nature's Modular, Multipurpose Structures' (1997) by Beinert, Holm, and Münck, as it provides a foundational overview of cluster types, functions, and ubiquity in biology with 1909 citations.
Key Papers Explained
'Iron-Sulfur Clusters: Nature's Modular, Multipurpose Structures' (1997) by Beinert et al. establishes core properties of Fe-S clusters, which 'X-ray Crystal Structure of the Fe-Only Hydrogenase (CpI) from Clostridium pasteurianum to 1.8 Angstrom Resolution' (1998) by Peters applies to reveal the H-cluster in a specific hydrogenase. Lubitz et al. (2014) in 'Hydrogenases' integrate these with spectroscopic insights into mechanism, while Hinnemann et al. (2005) in 'Biomimetic Hydrogen Evolution: MoS₂ Nanoparticles as Catalyst for Hydrogen Evolution' extend to synthetic catalysts inspired by cluster edges. Burgess and Lowe (1996) in 'Mechanism of Molybdenum Nitrogenase' connects clusters to nitrogenase electron transfer.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Research focuses on structure-function of hydrogenases and nitrogenases, with 'Hydrogenases' (2014) by Lubitz et al. synthesizing mechanisms, but no recent preprints available to indicate shifts beyond established electrocatalytic H₂ production and mitochondrial biogenesis studies.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | Biomimetic Hydrogen Evolution: MoS<sub>2</sub>Nanoparticles a... | 2005 | Journal of the America... | 3.9K | ✕ |
| 2 | Photoinduced electron transfer in supramolecular systems for a... | 1992 | Chemical Reviews | 3.0K | ✕ |
| 3 | Comparison of Experimental Binding Data and Theoretical Models... | 1966 | Biochemistry | 3.0K | ✕ |
| 4 | FLS2 | 2000 | Molecular Cell | 2.2K | ✓ |
| 5 | Notch3 mutations in CADASIL, a hereditary adult-onset conditio... | 1996 | Nature | 2.0K | ✕ |
| 6 | Hydrogenases | 2014 | Chemical Reviews | 1.9K | ✓ |
| 7 | Iron-Sulfur Clusters: Nature's Modular, Multipurpose Structures | 1997 | Science | 1.9K | ✕ |
| 8 | X-ray Crystal Structure of the Fe-Only Hydrogenase (CpI) from ... | 1998 | — | 1.9K | ✕ |
| 9 | Natural engineering principles of electron tunnelling in biolo... | 1999 | Nature | 1.8K | ✕ |
| 10 | Mechanism of Molybdenum Nitrogenase | 1996 | Chemical Reviews | 1.8K | ✕ |
Frequently Asked Questions
What are iron-sulfur clusters?
Iron-sulfur clusters are modular structures like Fe₂S₂, Fe₃S₄, and Fe₄S₄ found in proteins across all life forms. They undergo oxidation-reduction reactions, can be inserted or removed from proteins, and influence structure via side chain ligation. Beinert et al. (1997) in 'Iron-Sulfur Clusters: Nature's Modular, Multipurpose Structures' describe their multipurpose roles.
How do hydrogenases function?
Hydrogenases catalyze H₂ production and oxidation using metal centers, including iron-only active sites. The 1.8 Å X-ray structure of CpI from Clostridium pasteurianum reveals a di-iron site with CO and CN⁻ ligands enabling two-electron reduction of protons to H₂. Peters (1998) in 'X-ray Crystal Structure of the Fe-Only Hydrogenase (CpI) from Clostridium pasteurianum to 1.8 Angstrom Resolution' provides this atomic detail.
What is the role of iron-sulfur clusters in nitrogen fixation?
Iron-sulfur clusters in nitrogenase facilitate electron transfer and substrate reduction in molybdenum nitrogenase. They form part of the Fe protein and P-cluster for N₂ reduction to ammonia. Burgess and Lowe (1996) in 'Mechanism of Molybdenum Nitrogenase' outline this multi-electron process.
What are biomimetic models for hydrogen evolution?
Biomimetic models replicate enzyme active sites for electrocatalytic H₂ production, such as MoS₂ nanoparticles mimicking edge sites in hydrogenases. Hinnemann et al. (2005) in 'Biomimetic Hydrogen Evolution: MoS₂ Nanoparticles as Catalyst for Hydrogen Evolution' show these achieve high turnover frequencies comparable to platinum.
What is the structure of [FeFe]-hydrogenases?
[FeFe]-hydrogenases contain a di-iron active site bridged by sulfur and ligated by CO, CN⁻, and a dithiomethylamine group. Lubitz et al. (2014) in 'Hydrogenases' review spectroscopic and structural data confirming this H-cluster configuration for reversible H₂ activation.
Open Research Questions
- ? How do iron-sulfur clusters dynamically assemble and disassemble in mitochondrial biogenesis?
- ? What precise electronic structures enable ultra-efficient proton-to-hydrogen conversion in [FeFe]-hydrogenases?
- ? Can biomimetic iron-sulfur catalysts achieve turnover rates matching natural nitrogenases under ambient conditions?
- ? How do protein subunit interactions modulate iron-sulfur cluster redox potentials in multi-subunit enzymes?
- ? What are the rate-limiting steps in electron tunneling through iron-sulfur chains during biological oxidation-reduction?
Recent Trends
The field includes 35,176 works with sustained interest in hydrogenases and iron-sulfur clusters for energy applications, as evidenced by high citations for 'Hydrogenases' by Lubitz et al. (1949 citations) and 'Biomimetic Hydrogen Evolution: MoS₂ Nanoparticles as Catalyst for Hydrogen Evolution' (2005) by Hinnemann et al. (3932 citations), though growth rate over 5 years is not available and no preprints or news from the last 12 months signal new directions.
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