Identification of the YfgF MASE1 domain as a modulator of bacterial responses to aspartate

LACEY, M., AGASING, A., LOWRY, R. and GREEN, J. (2013). Identification of the YfgF MASE1 domain as a modulator of bacterial responses to aspartate. Open Biology, 3 (6), p. 130046.

Lacey_identification_of_the_YfgF.pdf - Published Version
Available under License Creative Commons Attribution.

Download (855kB) | Preview
Official URL:
Link to published version:: 10.1098/rsob.130046


Complex 3'-5'-cyclic diguanylic acid (c-di-GMP) responsive regulatory networks that are modulated by the action of multiple diguanylate cyclases (DGC; GGDEF domain proteins) and phosphodiesterases (PDE; EAL domain proteins) have evolved in many bacteria. YfgF proteins possess a membrane-anchoring domain (MASE1), a catalytically inactive GGDEF domain and a catalytically active EAL domain. Here, sustained expression of the Salmonella enterica spp. Enterica ser. Enteritidis YfgF protein is shown to mediate inhibition of the formation of the aspartate chemotactic ring on motility agar under aerobic conditions. This phenomenon was c-di-GMP-independent because it occurred in a Salmonella strain that lacked the ability to synthesize c-di-GMP and also when PDE activity was abolished by site-directed mutagenesis of the EAL domain. YfgF-mediated inhibition of aspartate chemotactic ring formation was impaired in the altered redox environment generated by exogenous p-benzoquinone. This ability of YfgF to inhibit the response to aspartate required a motif, (213)Lys-Lys-Glu(215), in the predicted cytoplasmic loop between trans-membrane regions 5 and 6 of the MASE1 domain. Thus, for the first time the function of a MASE1 domain as a redox-responsive regulator of bacterial responses to aspartate has been shown.

Item Type: Article
Research Institute, Centre or Group: Biomolecular Sciences Research Centre
Identification Number: 10.1098/rsob.130046
Depositing User: Marguerite Lyons
Date Deposited: 19 Aug 2013 09:26
Last Modified: 20 Aug 2015 05:46

Actions (login required)

View Item View Item


Downloads per month over past year

View more statistics