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Operons02:09

Operons

Prokaryotes can control gene expression through operons—DNA sequences consisting of regulatory elements and clustered, functionally related protein-coding genes. Operons use a single promoter sequence to initiate transcription of a gene cluster (i.e., a group of structural genes) into a single mRNA molecule. The terminator sequence ends transcription. An operator sequence, located between the promoter and structural genes, prohibits the operon’s transcriptional activity if bound by a repressor...
Prokaryotic Transcriptional Activators and Repressors01:58

Prokaryotic Transcriptional Activators and Repressors

The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...
Operons02:09

Operons

Prokaryotes can control gene expression through operons—DNA sequences consisting of regulatory elements and clustered, functionally related protein-coding genes. Operons use a single promoter sequence to initiate transcription of a gene cluster (i.e., a group of structural genes) into a single mRNA molecule. The terminator sequence ends transcription. An operator sequence, located between the promoter and structural genes, prohibits the operon’s transcriptional activity if bound by a repressor...
Prokaryotic Transcriptional Activators and Repressors01:58

Prokaryotic Transcriptional Activators and Repressors

The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...
Operon Model01:23

Operon Model

The operon model represents a fundamental mechanism of gene regulation in prokaryotes, enabling coordinated expression of genes involved in related metabolic or functional pathways. Operons consist of structural genes, a promoter, and an operator, with transcription regulated by repressors, activators, and small effector molecules.Structure and Function of OperonsAn operon is a cluster of structural genes transcribed together under the control of a single promoter. The promoter region...
Inducible Operons: lac Operon01:25

Inducible Operons: lac Operon

The lac operon in Escherichia coli is a model for understanding inducible gene regulation and metabolic flexibility. It integrates local control by lactose and global regulation through catabolite repression, enabling E. coli to preferentially metabolize glucose when available and switch to lactose utilization when glucose is scarce.Structure and Function of the lac OperonThe lac operon contains three structural genes: lacZ (β-galactosidase), lacY (lactose permease), and lacA (thiogalactoside...

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Video Experimental Relacionado

Updated: Jun 1, 2026

Localization of Odorant Receptor Genes in Locust Antennae by RNA In Situ Hybridization
09:30

Localization of Odorant Receptor Genes in Locust Antennae by RNA In Situ Hybridization

Published on: July 13, 2017

Cómo lambda repressor y lambda Cro distinguen entre OR1 y OR3

A Hochschild, J Douhan, M Ptashne

    Cell
    |December 5, 1986
    PubMed
    Resumen
    Este resumen es generado por máquina.

    El represor lambda de los bacteriófagos y las proteínas Cro distinguen entre secuencias de operador de ADN. Los aminoácidos específicos en las proteínas y los pares de bases en los operadores determinan estas preferencias de reconocimiento.

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    Localization of Odorant Receptor Genes in Locust Antennae by RNA In Situ Hybridization
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    Published on: July 17, 2018

    Área de la Ciencia:

    • Biología Molecular Biología Molecular
    • Genética La genética.
    • Interacciones entre proteínas y ADN.

    Sus antecedentes:

    • Las proteínas lambda repressor y lambda Cro se unen a sitios operarios compartidos en el cromosoma del fago.
    • Estas proteínas exhiben preferencias de unión distintas para secuencias operadoras específicas (OR1 y OR3).

    Objetivo del estudio:

    • Investigar la base molecular de las especificidades de unión diferencial de las proteínas lambda repressor y Cro.
    • Para identificar los principales residuos de aminoácidos y pares de bases de ADN responsables de la discriminación entre las secuencias de operadores.

    Principales métodos:

    • Se empleó mutagénesis dirigida al sitio para alterar los pares de bases dentro de las secuencias del operador.
    • Se introdujeron sustituciones de aminoácidos en las hélices de reconocimiento y los brazos amino-terminales del represor y las proteínas Cro.
    • Se analizaron las afinidades de unión para determinar el impacto de estas modificaciones en las interacciones proteína-ADN.

    Principales resultados:

    • Las preferencias de proteínas están dictadas por los residuos 5 y 6 de las hélices de reconocimiento y el brazo amino-terminal (para el represor).
    • Las posiciones clave del operador de ADN para la discriminación son la posición 3 (para Cro) y las posiciones 5 y 8 (para el represor).
    • Las interacciones específicas aminoácido-proteína y pares de bases sustentan las distintas capacidades de reconocimiento del represor y Cro.

    Conclusiones:

    • El estudio aclara los mecanismos moleculares por los cuales el represor lambda y Cro logran la unión de ADN específica de la secuencia.
    • Estos hallazgos contribuyen a una comprensión más profunda de cómo las proteínas relacionadas pueden evolucionar perfiles de reconocimiento de ADN distintos.
    • Los residuos y pares de bases identificados son determinantes críticos de la discriminación de los operadores.