Video Experimental Relacionado
Updated: Jun 18, 2026
11:56
Antimicrobial Peptides Produced by Selective Pressure Incorporation of Non-canonical Amino Acids
Published on: May 4, 2018
Generación de variantes de tiocilina por sustitución de genes prepeptídicos y procesamiento in vivo por Bacillus
Michael G Acker1, Albert A Bowers, Christopher T Walsh
1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts 02115, USA.
Journal of the American Chemical Society
|November 17, 2009
Resumen
Los investigadores diseñaron nuevas variantes de tiocilina modificando el gen del péptido precursor. Esta exploración de las relaciones estructura-actividad tiene como objetivo superar las limitaciones farmacocinéticas de estos potentes antibióticos de productos naturales.
Área de la Ciencia:
- Química de los productos naturales.
- Microbiología Microbiología.
- Química medicinal es la química de los medicamentos.
Sus antecedentes:
- Las tiocilinas son potentes antibióticos de productos naturales derivados de péptidos sintetizados por ribosoma.
- Se requieren extensas modificaciones postraslacionales para formar el compuesto macrocíclico maduro.
- Las pobres propiedades farmacocinéticas han obstaculizado la aplicación clínica de las tiocilinas.
Objetivo del estudio:
- Para generar nuevas variantes de tiocilina con propiedades mejoradas.
- Investigar las relaciones estructura-actividad que rigen la maduración del péptido precursor de la tiocilina.
- Explorar las relaciones estructura-actividad relacionadas con la actividad de los antibióticos.
Principales métodos:
- Manipulación in vivo del gen que codifica el péptido precursor de la tiocilina.
- Generación de 65 nuevas variantes de tiocilina.
- Análisis de las relaciones estructura-actividad.
Principales resultados:
- Generó con éxito 65 nuevas variantes de tiocilina.
- Estableció una plataforma para explorar las relaciones estructura-actividad en la producción y función de la tiocilina.
- Estableció las bases para el desarrollo de tiocilinas con perfiles farmacocinéticos mejorados.
Conclusiones:
- La ingeniería del gen del péptido precursor de la tiocilina es una estrategia viable para crear diversas variantes.
- Comprender las relaciones estructura-actividad es crucial para superar las limitaciones farmacocinéticas.
- Este enfoque es prometedor para el futuro desarrollo de terapias basadas en tiocilina.
Videos de Conceptos Relacionados
01:30Production of Pharmaceuticals
Industrial insulin production uses genetically engineered E. coli expressing a proinsulin gene controlled by a tryptophan promoter and containing a methionine linker for later cleavage. The cells also carry ampicillin resistance for selective growth. Seed cultures are stored at −80 °C and production begins by thawing a small amount to inoculate starter cultures, which are progressively scaled to a 50,000-L bioreactor. In the bioreactor, E. coli grow in nutrient-rich media under sterile, tightly...
01:29Coordination of Gene Expression Processes in Bacteria
The DNA replication, transcription, and translation processes are intricately coupled in bacteria, allowing efficient gene expression and rapid protein synthesis. While this physical and functional coordination is advantageous, it introduces challenges that bacteria overcome through specific regulatory mechanisms.Coupling of Replication, Transcription, and TranslationThe coupling of replication, transcription, and translation is a hallmark of bacterial gene expression. As the replisome unwinds...
01:17Gram-negative Bacterial Protein Secretion Systems
Gram-negative bacteria utilize sophisticated protein secretion systems to transport proteins across their double-membrane envelope into the extracellular environment or host cells. Based on their mechanism of action, these systems are classified into one-step and two-step pathways.One-Step Secretion Systems (Types I, III, IV, and VI)One-step secretion systems bypass the periplasm entirely, forming a continuous channel that spans both the inner and outer membranes:Type I Secretion System (T1SS):...
02:50Transgenic Plants
Recombinant DNA technology called transgenesis is often used to add a foreign gene or remove a detrimental gene from an organism. Such genetically modified organisms are called transgenic organisms.
The first-ever transgenic plant was a tobacco plant developed in 1983 that showed resistance against the tobacco mosaic virus. Since then, many transgenic plants have been developed and commercialized for improving the agricultural, ornamental, and horticultural value of a crop plant. Transgenic...
The first-ever transgenic plant was a tobacco plant developed in 1983 that showed resistance against the tobacco mosaic virus. Since then, many transgenic plants have been developed and commercialized for improving the agricultural, ornamental, and horticultural value of a crop plant. Transgenic...
02:53CRISPR and crRNAs
Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
The CRISPR-Cas system stores a copy of foreign DNA in the host genome and uses it to identify the foreign DNA upon reinfection. CRISPR-Cas has three different...
01:27Production of Antibiotics
Penicillin, one of the earliest and most widely used antibiotics, is produced industrially by the filamentous fungus Penicillium chrysogenum. Large stirred-tank bioreactors ranging from tens to hundreds of thousands of liters maintain tightly controlled temperature, pH, and dissolved oxygen conditions to support fungal metabolism and maximize antibiotic yield. Penicillin is a secondary metabolite, synthesized primarily during the stationary growth phase, which requires a carefully managed...