Precise assembly of complex beta sheet topologies from de novo designed building blocks.
Elife
; 42015 Dec 09.
Article
en En
| MEDLINE
| ID: mdl-26650357
ABSTRACT
Design of complex alpha-beta protein topologies poses a challenge because of the large number of alternative packing arrangements. A similar challenge presumably limited the emergence of large and complex protein topologies in evolution. Here, we demonstrate that protein topologies with six and seven-stranded beta sheets can be designed by insertion of one de novo designed beta sheet containing protein into another such that the two beta sheets are merged to form a single extended sheet, followed by amino acid sequence optimization at the newly formed strand-strand, strand-helix, and helix-helix interfaces. Crystal structures of two such designs closely match the computational design models. Searches for similar structures in the SCOP protein domain database yield only weak matches with different beta sheet connectivities. A similar beta sheet fusion mechanism may have contributed to the emergence of complex beta sheets during natural protein evolution.
Palabras clave
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Proteínas Recombinantes de Fusión
/
Ingeniería de Proteínas
/
Estructura Secundaria de Proteína
Idioma:
En
Revista:
Elife
Año:
2015
Tipo del documento:
Article
País de afiliación:
Estados Unidos