In <it>Helicobacter pylori </it>auto-inducer-2, but not LuxS/MccAB catalysed reverse transsulphuration, regulates motility through modulation of flagellar gene transcription
<p>Abstract</p> <p>Background</p> <p>LuxS may function as a metabolic enzyme or as the synthase of a quorum sensing signalling molecule, auto-inducer-2 (AI-2); hence, the mechanism underlying phenotypic changes upon <it>luxS </it>inactivation is not always c...
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doaj-baaf8c0f2caa4eb8a959694779c1b1a62020-11-24T23:18:31ZengBMCBMC Microbiology1471-21802010-08-0110121010.1186/1471-2180-10-210In <it>Helicobacter pylori </it>auto-inducer-2, but not LuxS/MccAB catalysed reverse transsulphuration, regulates motility through modulation of flagellar gene transcriptionDoherty NeilHobley LauraShen FeifeiLoh John TCover Timothy LSockett R ElizabethHardie Kim RAtherton John C<p>Abstract</p> <p>Background</p> <p>LuxS may function as a metabolic enzyme or as the synthase of a quorum sensing signalling molecule, auto-inducer-2 (AI-2); hence, the mechanism underlying phenotypic changes upon <it>luxS </it>inactivation is not always clear. In <it>Helicobacter pylori</it>, we have recently shown that, rather than functioning in recycling methionine as in most bacteria, LuxS (along with newly-characterised MccA and MccB), synthesises cysteine via reverse transsulphuration. In this study, we investigated whether and how LuxS controls motility of <it>H. pylori</it>, specifically if it has its effects via <it>luxS</it>-required cysteine metabolism or via AI-2 synthesis only.</p> <p>Results</p> <p>We report that disruption of <it>luxS </it>renders <it>H. pylori </it>non-motile in soft agar and by microscopy, whereas disruption of <it>mccA</it><sub>Hp </sub>or <it>mccB</it><sub>Hp </sub>(other genes in the cysteine provision pathway) does not, implying that the lost phenotype is not due to disrupted cysteine provision. The motility defect of the Δ<it>luxS</it><sub>Hp </sub>mutant was complemented genetically by <it>luxS</it><sub>Hp </sub>and also by addition of <it>in vitro </it>synthesised AI-2 or 4, 5-dihydroxy-2, 3-pentanedione (DPD, the precursor of AI-2). In contrast, exogenously added cysteine could not restore motility to the Δ<it>luxS</it><sub>Hp </sub>mutant, confirming that AI-2 synthesis, but not the metabolic effect of LuxS was important. Microscopy showed reduced number and length of flagella in the Δ<it>luxS</it><sub>Hp </sub>mutant. Immunoblotting identified decreased levels of FlaA and FlgE but not FlaB in the Δ<it>luxS</it><sub>Hp </sub>mutant, and RT-PCR showed that the expression of <it>flaA, flgE</it>, <it>motA</it>, <it>motB</it>, <it>flhA </it>and <it>fliI </it>but not <it>flaB </it>was reduced. Addition of DPD but not cysteine to the Δ<it>luxS</it><sub>Hp </sub>mutant restored flagellar gene transcription, and the number and length of flagella.</p> <p>Conclusions</p> <p>Our data show that as well as being a metabolic enzyme, <it>H. pylori </it>LuxS has an alternative role in regulation of motility by modulating flagellar transcripts and flagellar biosynthesis through production of the signalling molecule AI-2.</p> http://www.biomedcentral.com/1471-2180/10/210 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Doherty Neil Hobley Laura Shen Feifei Loh John T Cover Timothy L Sockett R Elizabeth Hardie Kim R Atherton John C |
spellingShingle |
Doherty Neil Hobley Laura Shen Feifei Loh John T Cover Timothy L Sockett R Elizabeth Hardie Kim R Atherton John C In <it>Helicobacter pylori </it>auto-inducer-2, but not LuxS/MccAB catalysed reverse transsulphuration, regulates motility through modulation of flagellar gene transcription BMC Microbiology |
author_facet |
Doherty Neil Hobley Laura Shen Feifei Loh John T Cover Timothy L Sockett R Elizabeth Hardie Kim R Atherton John C |
author_sort |
Doherty Neil |
title |
In <it>Helicobacter pylori </it>auto-inducer-2, but not LuxS/MccAB catalysed reverse transsulphuration, regulates motility through modulation of flagellar gene transcription |
title_short |
In <it>Helicobacter pylori </it>auto-inducer-2, but not LuxS/MccAB catalysed reverse transsulphuration, regulates motility through modulation of flagellar gene transcription |
title_full |
In <it>Helicobacter pylori </it>auto-inducer-2, but not LuxS/MccAB catalysed reverse transsulphuration, regulates motility through modulation of flagellar gene transcription |
title_fullStr |
In <it>Helicobacter pylori </it>auto-inducer-2, but not LuxS/MccAB catalysed reverse transsulphuration, regulates motility through modulation of flagellar gene transcription |
title_full_unstemmed |
In <it>Helicobacter pylori </it>auto-inducer-2, but not LuxS/MccAB catalysed reverse transsulphuration, regulates motility through modulation of flagellar gene transcription |
title_sort |
in <it>helicobacter pylori </it>auto-inducer-2, but not luxs/mccab catalysed reverse transsulphuration, regulates motility through modulation of flagellar gene transcription |
publisher |
BMC |
series |
BMC Microbiology |
issn |
1471-2180 |
publishDate |
2010-08-01 |
description |
<p>Abstract</p> <p>Background</p> <p>LuxS may function as a metabolic enzyme or as the synthase of a quorum sensing signalling molecule, auto-inducer-2 (AI-2); hence, the mechanism underlying phenotypic changes upon <it>luxS </it>inactivation is not always clear. In <it>Helicobacter pylori</it>, we have recently shown that, rather than functioning in recycling methionine as in most bacteria, LuxS (along with newly-characterised MccA and MccB), synthesises cysteine via reverse transsulphuration. In this study, we investigated whether and how LuxS controls motility of <it>H. pylori</it>, specifically if it has its effects via <it>luxS</it>-required cysteine metabolism or via AI-2 synthesis only.</p> <p>Results</p> <p>We report that disruption of <it>luxS </it>renders <it>H. pylori </it>non-motile in soft agar and by microscopy, whereas disruption of <it>mccA</it><sub>Hp </sub>or <it>mccB</it><sub>Hp </sub>(other genes in the cysteine provision pathway) does not, implying that the lost phenotype is not due to disrupted cysteine provision. The motility defect of the Δ<it>luxS</it><sub>Hp </sub>mutant was complemented genetically by <it>luxS</it><sub>Hp </sub>and also by addition of <it>in vitro </it>synthesised AI-2 or 4, 5-dihydroxy-2, 3-pentanedione (DPD, the precursor of AI-2). In contrast, exogenously added cysteine could not restore motility to the Δ<it>luxS</it><sub>Hp </sub>mutant, confirming that AI-2 synthesis, but not the metabolic effect of LuxS was important. Microscopy showed reduced number and length of flagella in the Δ<it>luxS</it><sub>Hp </sub>mutant. Immunoblotting identified decreased levels of FlaA and FlgE but not FlaB in the Δ<it>luxS</it><sub>Hp </sub>mutant, and RT-PCR showed that the expression of <it>flaA, flgE</it>, <it>motA</it>, <it>motB</it>, <it>flhA </it>and <it>fliI </it>but not <it>flaB </it>was reduced. Addition of DPD but not cysteine to the Δ<it>luxS</it><sub>Hp </sub>mutant restored flagellar gene transcription, and the number and length of flagella.</p> <p>Conclusions</p> <p>Our data show that as well as being a metabolic enzyme, <it>H. pylori </it>LuxS has an alternative role in regulation of motility by modulating flagellar transcripts and flagellar biosynthesis through production of the signalling molecule AI-2.</p> |
url |
http://www.biomedcentral.com/1471-2180/10/210 |
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