Estamos realizando la búsqueda. Por favor, espere...

Functional interactions of VirB11 traffic ATPases with VirB4 and VirD4 molecular motors in Type IV secretion systems

Abstract: Pilus biogenesis and substrate transport by type IV secretion systems require energy, which is provided by three molecular motors localized at the base of the secretion channel. One of these motors, VirB11, belongs to the superfamily of traffic ATPases, which includes members of the type II secretion system and the type IV pilus and archaeal flagellar assembly apparatus. Here, we report the functional interactions between TrwD, the VirB11 homolog of the conjugative plasmid R388, and TrwK and TrwB, the motors involved in pilus biogenesis and DNA transport, respectively. Although these interactions remained standing upon replacement of the traffic ATPase by a homolog from a phylogenetically related conjugative system, namely, TraG of plasmid pKM101, this homolog could not replace the TrwD function for DNA transfer. This result suggests that VirB11 works as a switch between pilus biogenesis and DNA transport and reinforces a mechanistic model in which VirB11 proteins act as traffic ATPases by regulating both events in type IV secretion systems.

 Autoría: Ripoll-Rozada J., Zunzunegui S., de la Cruz F., Arechaga I., Cabezón E.,

 Fuente: Journal of Bacteriology, 2013, 195(18), 4195-201

 Editorial: American Society for Microbiology

 Año de publicación: 2013

 Tipo de publicación: Artículo de Revista

 DOI: 10.1128/JB.00437-13

 ISSN: 0021-9193,1098-5530

 Proyecto español: BFU2011-22874

 Url de la publicación: https://www.doi.org/10.1128/JB.00437-13