Escherichia coli RclA and Staphylococcus aureus MerA are part of the Group I flavoprotein disulfide reductase (FDR) family
and have been implicated in the contribution to bacterial pathogenesis by defending against the host immune response.
Fusobacterium nucleatum is a pathogenic, anaerobic Gram-negative bacterial species commonly found in the human oral
cavity and gastrointestinal tract. In this study, we discovered that the F. nucleatum protein FN0820, belonging to the Group I
FDR family, exhibited a higher activity of a Cu2+-
dependent NADH oxidase than E. coli RclA. Moreover, FN0820 decreased
the dissolved oxygen level in the solution with higher NADH oxidase activity. We found that L-tryptophan and its analog
5-hydroxytryptophan inhibit the FN0820 activities of NADH oxidase and the concomitant reduction of oxygen. Our results
have implications for developing new treatment strategies against pathogens that defend the host immune response with
Group I FDRs.
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Michael J. Gray, Laurie E. Comstock Journal of Bacteriology.2024;[Epub] CrossRef
A Gram-stain-negative, strictly aerobic, short-rod-shaped,
and non-motile bacterial strain designated HSLHS9T was
isolated from surface seawater collected from the South China
Sea. Strain HSLHS9T could grow at 15–41°C (optimum 28°C),
at pH 5.0–9.0 (optimum 6.0–7.0), and in 0–7% (w/v) NaCl
(optimum 2–3%). Phylogenetic analysis based on 16S rRNA
gene sequences indicated that strain HSLHS9T shared high
identities with the closely related Parahaliea aestuarii S2-26T
(98.6%) and Parahaliea mediterranea 7SM29T (97.8%) and
formed a distinct lineage within the genus Parahaliea. Wholegenome
sequencing of strain HSLHS9T revealed the size of 4.8
Mbp and DNA G + C content of 61.8 mol%. Strain HSLHS9T
shared the digital DNA-DNA hybridization values of 22.4%
and 23.0%, and the average nucleotide identities of 79.7%
and 79.9%, respectively, with the two type strains above. The
predominant cellular fatty acids of the strain were summed
feature 8 (C18:1 ω6c and/or C18:1 ω7c), summed feature 3 (C16:1
ω7c and/or C16:1 ω6c), C17:1 ω8c, and C16:0. The sole isoprenoid
quinone was identified as Q-8. The polar lipids were phosphatidylglycerol,
diphosphatidylglycerol, phosphatidylethanolamine,
aminolipid, and two glycolipids. Based on taxonomic
data obtained in this study, it is suggested that strain
HSLHS9T represents a novel species of the genus Parahaliea,
for which the name Parahaliea maris sp. nov. is proposed.
The type strain is HSLHS9T (= MCCC 1A06717T = KCTC
52307T). An emended description of the genus Parahaliea
is also provided.
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