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Síntesis inversa dependiente de transcriptasa de un compuesto de ADN-ARN ramificado y vinculado covalentemente en E.

D Lim¹, W K Maas

¹Department of Microbiology, New York University Medical Center, New York 10016.

|March 10, 1989

Resumen

Los investigadores descubrieron un nuevo compuesto ramificado de ADN-ARN en E. coli B, distinto de las mixobacterias. Un segmento de gen de E. coli B clonado permitió su producción en E. coli K12, revelando una transcriptasa inversa.

Área de la Ciencia:

Biología Molecular Biología Molecular
Microbiología Microbiología.
Genética La genética.

Sus antecedentes:

Los compuestos ramificados de ADN-ARN se han identificado previamente en mixobacterias.
Estos compuestos exhiben estructuras secundarias similares, pero difieren en sus secuencias de nucleótidos.
La formación y la base genética de tales compuestos en E. coli eran previamente desconocidas.

Objetivo del estudio:

Identificar y caracterizar un nuevo compuesto ramificado de ADN-ARN en E. coli B.
Para dilucidar los determinantes genéticos responsables de la formación de este compuesto.
Para investigar el papel de la transcriptasa inversa en la biosíntesis del compuesto ADN-ARN.

Principales métodos:

Aislamiento y secuenciación de nucleótidos del compuesto ramificado ADN-ARN de E. coli B.
Clonado de un segmento de 3,5 kb de ADN cromosómico de E. coli B.
Análisis funcional del segmento clonado en E. coli K12, incluyendo ensayos in vivo e in vitro.
Identificación y secuenciación de genes que codifican los componentes de ADN y ARN y una transcriptasa inversa.

Principales resultados:

Se identificó un nuevo compuesto ramificado de ADN-ARN en E. coli B, que difiere en secuencia de sus análogos mixobacterianos.
Se confirmó la producción del compuesto en E. coli K12 tras la transferencia de un fragmento específico de 3,5 kb de ADN de E. coli B.
El fragmento de ADN secuenciado contiene genes para los componentes de ADN y ARN y una transcriptasa inversa esencial para la formación de compuestos.

Conclusiones:

Un único compuesto ramificado de ADN-ARN se forma en E. coli B, dependiente de un conjunto específico de genes.
La transcriptasa inversa identificada juega un papel crucial en la formación in vivo e in vitro de este compuesto ADN-ARN.
Este descubrimiento amplía los mecanismos conocidos de la formación de compuestos de ADN-ARN en bacterias.

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