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Título: | The Structure of Phage ϕ29 Transcription Regulator p4-DNA Complex Reveals an N-Hook Motif for DNA Binding |
Autor: | Badia-Martínez, Daniel; Camacho, Ana CSIC; Pérez-Lago, Laura; Escandón, Cristina; Salas, Margarita CSIC ORCID ; Coll, Miquel CSIC ORCID | Palabras clave: | DNA PROTEINS MICROBIO |
Fecha de publicación: | 7-abr-2006 | Editor: | Cell Press | Citación: | Molecular Cell 22(1): 73-81 (2006) | Resumen: | Protein p4 affects the transcriptional switch that divides bacteriophage f29 infection in early and late phases. The synthesis of DNA replication proteins and p4 takes place in the early phase, while structural, morphogenesis, and lysis proteins are synthesized in the late phase. Transcriptional switch by p4 is achieved by activating the late promoter A3 and repressing the early promoters A2b and A2c. The crystal structure of p4 alone and in complex with a 41 bp DNA, including the A3 promoter binding site, helps us to understand how the phage cycle is controlled. Protein p4 has a unique a/b fold that includes a DNA recognition motif consisting of two N-terminal b turn substructures, or N-hooks, located at the tips of an elongated protein homodimer. The two N-hooks enter the major groove of the double helix, establishing base-specific contacts. AhighDNAcurvature allows p4 N-hooks to reach two major groove areas three helical turns apart, like a bow and its string | Versión del editor: | http://dx.doi.org/10.1016/j.molcel.2006.02.019 | URI: | http://hdl.handle.net/10261/109015 | DOI: | 10.1016/j.molcel.2006.02.019 | Identificadores: | doi: 10.1016/j.molcel.2006.02.019 issn: 1097-2765 |
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