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H-NS-dependent activation of pectate lyases synthesis in the phytopathogenic bacterium Erwinia chrysanthemi is mediated by the PecT repressor.
Mol Microbiol. 2002 Feb; 43(3):733-48.MM

Abstract

Production of the main virulence determinant pectate lyases (Pels) of the phytopathogenic bacterium Erwinia chrysanthemi is modulated by a complex regulatory network involving the repressor proteins KdgR, PecS and PecT and the activator systems Pir, ExpI-ExpR and CRP. Of these regulators, CRP and PecT are particularly important since the absence of CRP or a slight overproduction of PecT leads to a drastic reduction in synthesis of Pel species. Recently, it has been shown that production of Pel species is strongly reduced in an E. chrysanthemi hns mutant, suggesting an activator function of the nucleoid-associated protein H-NS in the expression of the pel genes. Here, we report that the reduced synthesis of Pel species in the hns mutant results from a negative control, exerted by H-NS, on the transcription of the regulatory gene pecT. This H-NS/PecT cascade regulation is one of the first elucidations of a positive effect of H-NS on target gene expression. Moreover, we found that H-NS also represses the expression of expI, expR and pel genes. H-NS control is the result of H-NS binding to extended regions within the pecT, expI, expR and pel genes. Investigation of the simultaneous binding of CRP, RNA polymerase (RNAP) and H-NS on the pelD gene revealed that these three proteins form a nucleoprotein com-plex. Together, these data indicate that, by exerting a negative control at multiple levels, H-NS plays a crucial role in the E. chrysanthemi pel regulatory network.

Authors+Show Affiliations

Unité de Microbiologie et Génétique, UMR-CNRS 5122, INSA, Batiment Louis Pasteur, 11 Avenue Jean Capelle, F-69621 Villeurbanne Cedex, France. nasser@insa.insa-lyon.frNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

11929528

Citation

Nasser, William, and Sylvie Reverchon. "H-NS-dependent Activation of Pectate Lyases Synthesis in the Phytopathogenic Bacterium Erwinia Chrysanthemi Is Mediated By the PecT Repressor." Molecular Microbiology, vol. 43, no. 3, 2002, pp. 733-48.
Nasser W, Reverchon S. H-NS-dependent activation of pectate lyases synthesis in the phytopathogenic bacterium Erwinia chrysanthemi is mediated by the PecT repressor. Mol Microbiol. 2002;43(3):733-48.
Nasser, W., & Reverchon, S. (2002). H-NS-dependent activation of pectate lyases synthesis in the phytopathogenic bacterium Erwinia chrysanthemi is mediated by the PecT repressor. Molecular Microbiology, 43(3), 733-48.
Nasser W, Reverchon S. H-NS-dependent Activation of Pectate Lyases Synthesis in the Phytopathogenic Bacterium Erwinia Chrysanthemi Is Mediated By the PecT Repressor. Mol Microbiol. 2002;43(3):733-48. PubMed PMID: 11929528.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - H-NS-dependent activation of pectate lyases synthesis in the phytopathogenic bacterium Erwinia chrysanthemi is mediated by the PecT repressor. AU - Nasser,William, AU - Reverchon,Sylvie, PY - 2002/4/4/pubmed PY - 2002/6/5/medline PY - 2002/4/4/entrez SP - 733 EP - 48 JF - Molecular microbiology JO - Mol Microbiol VL - 43 IS - 3 N2 - Production of the main virulence determinant pectate lyases (Pels) of the phytopathogenic bacterium Erwinia chrysanthemi is modulated by a complex regulatory network involving the repressor proteins KdgR, PecS and PecT and the activator systems Pir, ExpI-ExpR and CRP. Of these regulators, CRP and PecT are particularly important since the absence of CRP or a slight overproduction of PecT leads to a drastic reduction in synthesis of Pel species. Recently, it has been shown that production of Pel species is strongly reduced in an E. chrysanthemi hns mutant, suggesting an activator function of the nucleoid-associated protein H-NS in the expression of the pel genes. Here, we report that the reduced synthesis of Pel species in the hns mutant results from a negative control, exerted by H-NS, on the transcription of the regulatory gene pecT. This H-NS/PecT cascade regulation is one of the first elucidations of a positive effect of H-NS on target gene expression. Moreover, we found that H-NS also represses the expression of expI, expR and pel genes. H-NS control is the result of H-NS binding to extended regions within the pecT, expI, expR and pel genes. Investigation of the simultaneous binding of CRP, RNA polymerase (RNAP) and H-NS on the pelD gene revealed that these three proteins form a nucleoprotein com-plex. Together, these data indicate that, by exerting a negative control at multiple levels, H-NS plays a crucial role in the E. chrysanthemi pel regulatory network. SN - 0950-382X UR - https://www.unboundmedicine.com/medline/citation/11929528/H_NS_dependent_activation_of_pectate_lyases_synthesis_in_the_phytopathogenic_bacterium_Erwinia_chrysanthemi_is_mediated_by_the_PecT_repressor_ L2 - https://onlinelibrary.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=0950-382X&date=2002&volume=43&issue=3&spage=733 DB - PRIME DP - Unbound Medicine ER -