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Un mecanismo de acción bactericida alternativo para los péptidos lantibióticos dirigidos al lípido II
Hester E Hasper1, Naomi E Kramer, James L Smith
1Department of Biochemistry of Membranes, Bijvoet Center for Biomolecular Research, Institute of Biomembranes, Utrecht University, Padualaan 8, 3584 CH, Utrecht, Netherlands.
Science (New York, N.Y.)
|September 16, 2006
Resumen
Los antibióticos, una clase de péptidos antimicrobianos, matan a las bacterias al atacar la síntesis de la pared celular. Este estudio revela un nuevo mecanismo en el que algunos lantibióticos eliminan precursores clave de la pared celular, bloqueando el crecimiento bacteriano.
Área de la Ciencia:
- Microbiología Microbiología.
- La bioquímica es la bioquímica.
- Biología Molecular Biología Molecular
Sus antecedentes:
- Los antibióticos lantibióticos son péptidos modificados post-traducionalmente y sintetizados por ribosoma con propiedades antimicrobianas.
- Por lo general, se dirigen al lípido II, un precursor crucial de la pared celular en las bacterias Gram-positivas, formando poros para inducir la lisis celular.
- Algunos lantibióticos exhiben actividad antibacteriana a pesar de ser demasiado cortos para abarcar la bicapa lipídica.
Objetivo del estudio:
- Para aclarar el mecanismo de acción de los lantibióticos poros incompetentes.
- Investigar una vía antibacteriana alternativa para los miembros de la familia lantibiótica.
- Comprender cómo ciertos lantibióticos inhiben el crecimiento de bacterias Gram-positivas sin la formación de poros.
Principales métodos:
- Análisis comparativo de estructuras lantibióticas y mecanismos conocidos.
- Investigando la interacción de lantibióticos específicos con lípidos II y sitios de división celular bacteriana.
- Evaluar el impacto del tratamiento lantibiótico en la síntesis de la pared celular y la viabilidad bacteriana.
Principales resultados:
- Se demostró que ciertos lantibióticos no forman poros en la membrana bacteriana.
- Se identificó un nuevo mecanismo que implica el secuestro de lípido II desde el septo de división celular bacteriana.
- Se demostró que esta eliminación de lípidos II inhibe efectivamente la síntesis de la pared celular bacteriana y conduce a la muerte celular.
Conclusiones:
- Los antibióticos emplean diversas estrategias para eliminar las bacterias Gram-positivas.
- Un mecanismo alternativo de acción antibacteriana consiste en interrumpir la síntesis de la pared celular mediante el secuestro de lípidos II.
- Este hallazgo amplía nuestra comprensión de la matanza bacteriana mediada por lantibióticos y ofrece potencial para el desarrollo de nuevos antimicrobianos.
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