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Modulación de la actividad de la policetida sintasa por proteínas accesorias durante la biosíntesis de lovastatina
J Kennedy1, K Auclair, S G Kendrew
1School of Pharmacy, Bacteriology Department, University of Wisconsin, Madison, WI 53706, USA.
Science (New York, N.Y.)
|May 21, 1999
Resumen
La biosíntesis de la lovastatina involucra enzimas complejas de la policetida sintasa. Una nueva investigación identifica proteínas clave como LovC y LovD, cruciales para ensamblar la molécula de lovastatina y su esqueleto no acetídeo.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología Molecular Biología Molecular
- Metabolismo microbiano El metabolismo microbiano.
Sus antecedentes:
- Las policetidas son diversos metabolitos secundarios microbianos con aplicaciones médicas.
- La lovastatina, un medicamento para reducir el colesterol, se deriva de la biosíntesis de la policetida.
- El grupo de genes de la lovastatina codifica las poliquetidas sintasas tipo I.
Objetivo del estudio:
- Para aclarar las funciones específicas de las proteínas involucradas en la biosíntesis de lovastatina.
- Comprender el mecanismo de la formación del esqueleto no acetídeo.
- Para identificar las enzimas responsables del ensamblaje de la estructura final de lovastatina.
Principales métodos:
- Investigó el clúster de genes de la biosíntesis de lovastatina.
- Caracterizó las funciones de la lovastatina nonaketida sintasa (LNKS) y las proteínas asociadas.
- Se analizaron las funciones de la lovastatina dicetida sintasa (LDKS) y la transesterasa (LovD).
Principales resultados:
- La lovastatina nonaketida sintasa (LNKS) y LovC son esenciales para el esqueleto de la nonaketida y la producción de dihidromonacolina L.
- La lovastatina dicetida sintasa (LDKS) sintetiza la unidad de inicio del 2-metilbutirato.
- LovD, una transesterasa, acopla los precursores de dicetida y no acetida para formar la lovastatina.
Conclusiones:
- La biosíntesis de la lovastatina requiere un complejo multienzimático que involucra LNKS, LovC, LDKS y LovD.
- Las interacciones específicas de proteínas y las actividades enzimáticas son críticas para el ensamblaje preciso de los policetidos.
- Este estudio aclara los mecanismos moleculares subyacentes a la producción de lovastatina en microorganismos.
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