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			<gallery>
			File:ActiveSitesCorrected.png\|Active sites of hydrogenase enzymes
			File:NiFe_Hydrogenase.png\|Structure of NiFe hydrogenase
			File:FeFe_Hydrogenase.png\|Structure of FeFe hydrogenase
			File:Fe_Hydrogenase.png\|Structure of Fe hydrogenase
			</gallery>

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'''Hydrogenase''' is an [[enzyme]] that catalyzes the reversible oxidation of [[hydrogen]] ([[H2]]), playing a critical role in microbial [[metabolism]] by facilitating the uptake and release of H2. There are two main classes of hydrogenases, distinguished by the metal content of their active sites: [[nickel-iron hydrogenases]] (NiFe-hydrogenases) and [[iron-iron hydrogenases]] (FeFe-hydrogenases). A third, less common class, is the [[iron hydrogenase]] (Fe-hydrogenase), which contains only iron at its active site.

==Classification and Structure==
Hydrogenases are classified based on the metal content of their active site. The NiFe-hydrogenases and FeFe-hydrogenases are the most studied, with the former being more prevalent in nature. NiFe-hydrogenases typically oxidize H2 into protons and electrons, while FeFe-hydrogenases can both evolve and uptake H2, making them versatile in hydrogen metabolism.

===Nickel-Iron Hydrogenases===
[[Nickel-iron hydrogenases]] contain a nickel and an iron atom in their active site. They are involved in a wide range of biological processes, including [[anaerobic respiration]], [[photosynthesis]], and [[nitrogen fixation]]. These enzymes are characterized by their ability to reversibly oxidize hydrogen gas.

===Iron-Iron Hydrogenases===
[[Iron-iron hydrogenases]] have an active site that consists solely of iron atoms. They are known for their high efficiency in hydrogen gas production and uptake, playing a significant role in the metabolic processes of some [[microorganisms]]. FeFe-hydrogenases are particularly interesting for [[biohydrogen production]] due to their efficiency.

==Function and Mechanism==
Hydrogenases catalyze the reversible oxidation of hydrogen gas, a process that involves the transfer of electrons. The enzyme facilitates the conversion of molecular hydrogen into protons and electrons, which can then be used in various cellular processes. The mechanism of action involves the active site metal ions, which undergo oxidation-reduction reactions during the catalytic cycle.

==Biotechnological Applications==
Due to their ability to catalyze the reversible oxidation of hydrogen, hydrogenases have potential applications in [[renewable energy]] technologies, such as biohydrogen production and fuel cells. Their efficiency and specificity for hydrogen gas make them attractive targets for the development of biological hydrogen sensors and [[green chemistry]] processes.

==Research and Challenges==
Research on hydrogenases focuses on understanding their catalytic mechanisms, structure-function relationships, and potential applications in biotechnology. However, the sensitivity of hydrogenases to oxygen and the difficulty in heterologous expression pose challenges for their practical application. Efforts are underway to engineer more robust enzymes and to develop methods for their incorporation into synthetic systems.

[[Category:Enzymes]]
[[Category:Biochemistry]]
[[Category:Renewable energy]]

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Hydrogenase - Revision history

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