Video Experimental Relacionado

Updated: Jun 24, 2025

Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase

Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase

Published on: December 4, 2017

Las hidrogenasas mínimas e híbridas están activas en las arqueas

Chris Greening¹, Princess R Cabotaje², Luis E Valentin Alvarado³

¹Department of Microbiology, Biomedicine Discovery Institute, Monash University, Clayton, VIC, Australia; SAEF: Securing Antarctica's Environmental Future, Monash University, Clayton, VIC, Australia.

|June 12, 2024

Resumen

Las arqueas anaerobias poseen diversas hidrogenasas [FeFe], que anteriormente se pensaba que estaban ausentes en las arqueas. Este estudio revela nuevas adaptaciones de la hidrogenasa y vínculos evolutivos en el metabolismo arqueal.

Área de la Ciencia:

Microbiología
La bioquímica
Biología evolutiva

Sus antecedentes:

El ciclo del hidrógeno microbiano es crucial para los ecosistemas anóxicos.
Históricamente se creía que las hidrogenasas [FeFe] eran exclusivas de las bacterias y los eucariotas.

Objetivo del estudio:

Investigar la presencia y función de las hidrogenasas [FeFe] en las arqueas anaerobias.
Caracterizar los nuevos sistemas de hidrogenasa arqueal y su importancia evolutiva.

Principales métodos:

Análisis genómico de genomas arqueológicos existentes y nuevos.
Experimentos bioquímicos para confirmar la actividad de las enzimas.
Análisis filogenético y modelado estructural.

Principales resultados:

Las hidrogenasas [FeFe] están presentes en nueve filos arqueales y son expresadas por las arqueas de Asgard.
Se identificó una hidrogenasa ultraminimal en las arqueas DPANN.
Se descubrieron complejos de hidrogenasa híbridos [FeFe] y [NiFe] en diez órdenes arqueológicas.

Conclusiones:

Las arqueas anaerobias poseen linajes de hidrogenasa [FeFe] diversos y antiguos.
Se revelaron nuevas adaptaciones metabólicas y catalizadores H2 en las arqueas.
Se aclaró una profunda historia evolutiva y una evolución entrelazada entre las hidrogenasas [FeFe] y [NiFe].

Palabras clave:

de origen vegetal las arqueas eucariogénesis el hidrógeno hidrogenasa

Más Videos Relacionados

Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions

Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions

Published on: October 5, 2019

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

Published on: December 6, 2021

Videos de Conceptos Relacionados

Reduction of Alkenes: Catalytic Hydrogenation

Reduction of Alkenes: Catalytic Hydrogenation

Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.

Hybridization of Atomic Orbitals II

Hybridization of Atomic Orbitals II

sp3d and sp3d 2 Hybridization

Acid Halides to Carboxylic Acids: Hydrolysis

Acid Halides to Carboxylic Acids: Hydrolysis

Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic...

Radical Formation: Abstraction

Radical Formation: Abstraction

The electron of an atom can be abstracted from a compound by a relatively unstable radical to generate a new radical of relatively greater stability. For example, an initiator which forms radicals by homolysis can abstract a suitable species like a hydrogen atom or a halogen atom from a compound to generate a new radical. This ability of radicals to propagate by abstraction is a crucial feature of radical chain reactions.
Even though homolysis produces radicals, it is different from radical...