Recognition and processing of the origin of transfer DNA by conjugative relaxase TrwC.
Nat Struct Biol
; 10(12): 1002-10, 2003 Dec.
Article
en En
| MEDLINE
| ID: mdl-14625590
ABSTRACT
Relaxases are DNA strand transferases that catalyze the initial and final stages of DNA processing during conjugative cell-to-cell DNA transfer. Upon binding to the origin of transfer (oriT) DNA, relaxase TrwC melts the double helix. The three-dimensional structure of the relaxase domain of TrwC in complex with its cognate DNA at oriT shows a fold built on a two-layer alpha/beta sandwich, with a deep narrow cleft that houses the active site. The DNA includes one arm of an extruded cruciform, an essential feature for specific recognition. This arm is firmly embraced by the protein through a beta-ribbon positioned in the DNA major groove and a loop occupying the minor groove. It is followed by a single-stranded DNA segment that enters the active site, after a sharp U-turn forming a hydrophobic cage that traps the N-terminal methionine. Structural analysis combined with site-directed mutagenesis defines the architecture of the active site.
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Banco de datos:
MEDLINE
Asunto principal:
ADN
/
ADN Nucleotidiltransferasas
/
Endodesoxirribonucleasas
Idioma:
En
Revista:
Nat Struct Biol
Asunto de la revista:
BIOLOGIA MOLECULAR
Año:
2003
Tipo del documento:
Article
País de afiliación:
España