Video Experimental Relacionado

Updated: Sep 9, 2025

Author Spotlight: AQRNA-seq Role in Mapping Small RNAs and Unraveling Protein Translation Mechanisms

Author Spotlight: AQRNA-seq Role in Mapping Small RNAs and Unraveling Protein Translation Mechanisms

Published on: February 2, 2024

Identificación de ALKBH6 como una desmetilasa de nucleótidos con una preferencia distinta por el sustrato

Susmita Das¹, Sourbh Rankawat¹, Unnikrishnan P Shaji¹

¹Department of Biotechnology, Indian Institute of Technology Hyderabad (IITH), Kandi 502284, Sanga Reddy, Telangana, INDIA.

The Journal of biological chemistry

|August 30, 2025

Resumen

Los investigadores identificaron los sustratos evasivos del homólogo de AlkB 6 (ALKBH6) como N-7-metil-guanosina monofosfato (7me-GMP) y N-1-metil-adenosina monofosfato (1me-AMP), que son cruciales para el saneamiento de los nucleótidos metilados.

Área de la Ciencia:

La bioquímica
Biología molecular
La genética

Sus antecedentes:

Se sabe que las enzimas homólogas de AlkB (ALKBH) eliminan grupos metilo del ADN, el ARN y las proteínas.
El genoma humano codifica ocho genes ALKBH (ALKBH1-8).
El sustrato específico para ALKBH6 no ha sido identificado.

Objetivo del estudio:

Para identificar el sustrato (s) de ALKBH6.
Caracterizar la actividad enzimática y la especificidad del sustrato de ALKBH6.
Para investigar los posibles inhibidores de ALKBH6.

Principales métodos:

Ensayos bioquímicos
Análisis por espectrometría de masas
Cinética de las enzimas
Microscopía de inmunofluorescencia
ELISA (en inglés)

Principales resultados:

ALKBH6 desmetila el monofosfato de N-7-metil-guanosina (7me-GMP) y el monofosfato de N-1-metil-adenosina (1me-AMP).
Un grupo fosfato es esencial para el reconocimiento del sustrato ALKBH6; no se observó actividad en bases metiladas o nucleósidos.
El succinato y el 2-hidroxiglutarato fueron identificados como inhibidores de ALKBH6.
Se confirmó que 7me-GMP y 1me-AMP son sustratos endógenos de ALKBH6.

Conclusiones:

Este estudio caracteriza funcionalmente ALKBH6, ampliando el rango de sustrato conocido de las proteínas de la familia ALKBH.
ALKBH6 juega un papel importante en el proceso celular de eliminación de nucleótidos N-metilados.
Los hallazgos proporcionan información sobre la regulación y la posible orientación terapéutica de ALKBH6.

Palabras clave:

Se incluyen los siguientes elementos:AlkB El ADN Desmetilación reparación directa Agentes de metilación el nucleótido

Más Videos Relacionados

Specificity Analysis of Protein Lysine Methyltransferases Using SPOT Peptide Arrays

Specificity Analysis of Protein Lysine Methyltransferases Using SPOT Peptide Arrays

Published on: November 29, 2014

Sequence-specific Labeling of Nucleic Acids and Proteins with Methyltransferases and Cofactor Analogues

Sequence-specific Labeling of Nucleic Acids and Proteins with Methyltransferases and Cofactor Analogues

Published on: November 22, 2014

Videos de Conceptos Relacionados

Factors Affecting α-Alkylation of Ketones: Choice of Base

Factors Affecting α-Alkylation of Ketones: Choice of Base

α-Alkylation of ketones is achieved in the presence of alkyl halides and a base. The reaction proceeds via the formation of an enolate ion followed by nucleophilic substitution. The choice of base employed is essential as it is the key factor in determining the reaction outcome.
The reaction involving bases like EtO− whose conjugate acid EtOH (pKa = 15.9) is stronger than the ketone (pKa = 19.2) results in an equilibrium mixture with higher ketone concentration. As a consequence,...

Nucleophilic Aromatic Substitution: Elimination–Addition

Nucleophilic Aromatic Substitution: Elimination–Addition

Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...

Predicting Products: Substitution vs. Elimination

Predicting Products: Substitution vs. Elimination

When a nucleophile and an alkyl halide react, nucleophilic substitution and β-elimination reactions compete to generate products.
The following factors can influence the mechanisms competing against each other:

α-Alkylation of Ketones via Enolate Ions

α-Alkylation of Ketones via Enolate Ions

Ketones with α protons are deprotonated by strong bases like lithium diisopropylamide (LDA) to form enolate ions. The anion is stabilized by resonance, and its hybrid structure exhibits negative charges on the carbonyl oxygen and the α carbon. This ambident nucleophile can attack an electrophile via two possible sites: the carbonyl oxygen, known as O-attack, or the α carbon, known as C-attack. The nucleophilic attack via the carbanionic site is preferred. This is due to the...

Nucleophiles

Nucleophiles

The word “nucleophile” has a Greek root and translates to nucleus-loving. Nucleophiles are either negatively charged or neutral species with a pair of electrons in a high-energy occupied molecular orbital (HOMO). As these species tend to donate electron pairs, nucleophiles are considered Lewis bases as well. Negatively charged species, like OH−, Cl−, or HS−, with one or several pairs of electrons, are typically nucleophiles. Similarly, neutral species such as...

Nucleophilic Substitution Reactions

Nucleophilic Substitution Reactions

Historical perspective
In 1896, the German chemist Paul Walden discovered that he could interconvert pure enantiomeric (+) and (-) malic acids through a series of reactions. This conversion suggested the involvement of optical inversion during the substitution reaction. Further, in 1930, Sir Christopher Ingold described for the first time two different forms of nucleophilic substitution reactions, which are known as SN1 (nucleophilic substitution unimolecular) and SN2 (nucleophilic substitution...