Importance of fumarate and nitrate reduction regulatory protein for intestinal proliferation of Vibrio vulnificus.

Abstract:

:The sepsis caused by Vibrio vulnificus is characterized by an average incubation period of 26 h and a high mortality rate exceeding 50%. The fast growth and dissemination of V. vulnificus in vivo lead to poor clinical outcomes in patients. Therefore, elucidation of the proliferation mechanisms of this organism in vivo may lead to the development of an effective therapeutic strategy. In this study, we focused on the low oxygen concentration in the intestinal milieu because of its drastic difference from that in air. Fumarate and nitrate reduction regulatory protein (FNR) is known to be a global transcriptional regulator for adaptation to anaerobic conditions in various bacteria. We generated a strain of V. vulnificus in which the fnr gene was replaced with an erythromycin resistance gene (fnr::erm mutant). When the fnr::erm mutant was tested in a growth competition assay against the wild-type (WT) in vivo, the competitive index of fnr::erm mutant to WT in the intestinal loop and liver was 0.378 ± 0.192 (mean ± SD) and 0.243 ± 0.123, respectively. These data suggested that FNR is important for the proliferation of V. vulnificus in the intestine to achieve a critical mass to be able to invade the systemic circulation.

journal_name

FEMS Microbiol Lett

authors

Kado T,Kashimoto T,Yamazaki K,Ueno S

doi

10.1093/femsle/fnw274

subject

Has Abstract

pub_date

2017-01-01 00:00:00

issue

1

eissn

0378-1097

issn

1574-6968

pii

fnw274

journal_volume

364

pub_type

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