Abstract
The small basic histone-like protein H-NS is known for bacteria to attenuate virulence of several animal pathogens. An hns homologue from E. amylovora was identified by complementing an E. coli hns-mutant strain with a cosmid library from E. amylovora. A 1.6 kb EcoRI-fragment complemented the mucoid phenotype and repressed the ß-glucosidase activity of E. coli PD32. The open reading frame encoding an H-NS-like protein of 134 amino acid was later shown to be located on plasmid pEA29 (McGhee and Jones 2000). A chromosomal hns gene was amplified with PCR consensus primers and localized near galU of E. amylovora. E. amylovora mutants were created by insertion of a resistance cassette, and the intact gene was inserted into a high copy number plasmid for constitutive expression. Purified chromosomal H-NS protein preferentially bound to a DNA fragment from the lsc region and bending was predicted for an adjacent fragment with the rlsB-promoter. Levan production was significantly increased by hns mutations. Synthesis of the capsular exopolysaccharide amylovoran and of levan were reduced, when hns from the E. amylovora plasmid was overexpressed. A mutation in chromosomal hns of E. amylovora increased amylovoran synthesis, and both mutations retarded symptom formation on immature pears.
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Afflerbach H, Schroder O, Wagner R (1999) Conformational changes of the upstream DNA mediated by H-NS and FIS regulate E. coli RrnB P1 promoter activity. J Mol Biol 286:339–353
Aldridge PD (1996) The environmental and genetic regulation of virulence mechanisms of Erwinia amylovora. Thesis, University of Leicester
Ali Azam T, Iwata A, Nishimura A, Ueda S, Ishihama A (1999) Growth phase-dependent variation in protein composition of the Escherichia coli nucleoid. J Bacteriol 181:6361–6370
Atlung T, Ingmer H (1997) H-NS: a modulator of environmentally regulated gene expression. Mol Microbiol 24:7–17
Bahloul A, Boubrik F, Rouviere-Yaniv J (2001) Roles of Escherichia coli histone-like protein HU in DNA replication: HU-beta suppresses the thermosensitivity of dnaA46ts. Biochimie 83:219–229
Barny MA, Guinebretiere MH, Marcais B, Coissac E, Paulin JP, Laurent J (1990) Cloning of a large gene cluster involved in Erwinia amylovora CFBP1430 virulence. Mol Microbiol 4:777–786
Bellemann P, Bereswill S, Berger S, Geider K (1994) Visualisation of capsule formation by Erwinia amylovora and assays to determine amylovoran synthesis. Internat J Biol Macromol 16:290–296
Beloin C, Deighan P, Doyle M, Dorman CJ (2003) Shigella flexneri 2a strain 2457T expresses three embers of the H-NS-like protein familiy: characterization of the Shf protein. Mol Gen Genomics 270:66–77
Bereswill S, Geider K (1997) Characteristion of the rcsB gene from Erwinia amylovora and its influence on exopolysaccharide synthesis and virulence of the fire blight pathogen. J Bacteriol 179:1354–1361
Bereswill S, Pahl A, Bellemann P, Zeller W, Geider K (1992) Sensitive and species-specific detection of Erwinia amylovora by polymerase chain reaction analysis. Appl Environ Microbiol 58:3522–3526
Bernhard F, Poetter K, Geider K, Coplin DL (1990) The rcsA gene from Erwinia amylovora: identification, nucleotide sequence and regulation of exopolysaccharide biosynthesis. Mol Plant Microbe Interact 3:429–437
Bertin P, Terao E, Lee EH, Lejeune P, Colson C, Danchin A, Collatz E (1994) The H-NS protein is involved in the biogenesis of flagella in Escherichia coli. J Bacteriol 176:5537–5540
Bogs J, Bruchmüller I, Erbar C, Geider K (1998) Colonization of host plants by the fire blight pathogen Erwinia amylovora marked with genes for bioluminescence and fluorescence. Phytopathology 88:416–421
Brunetti R, Prosseda G, Beghetto E, Colonna B, Micheli G (2001) The looped domain organization of the nucleoid in histone-like protein defective Escherichia coli strains. Biochimie 83:873–882
Bugert P, Geider K (1995) Molecular analysis of the ams operon required for exopolysaccharide synthesis of Erwinia amylovora. Mol Microbiol 15:917–933
Claret L, Rouviére-Yaniv (1997) Variation in HU composition during growth of Escherichia coli: the heteroduplex is required for long term survival. J Mol Biol 273:93–104
Csonka LN, Hanson AD (1991) Prokaryotic osmoregulation: genetics and physiology. Annu Rev Microbiol 45:569–606
Dame RT, Wyman C, Wurm R, Wagner R, Goosen N (2002) Structural basis for H-NS-mediated trapping of RNA polymerase in the open initiation complex at the rrnB P1. J Biol Chem 277:2146–2150
Dame RT, Goosen N (2002) HU: promoting or counteracting DNA compaction? FEBS Lett 529:151–156
Dersch P, Schmidt K, Bremer E (1993) Synthesis of the Escherichia coli K-12 nucleoid-associated DNA-binding protein H-NS is subjected to growth-phase control and autoregulation. Mol Microbiol 8:875–889
Dole S, Nagarajavel V, Schnetz K (2004) The histone-like nucleoid structuring protein H-NS represses the Escherichia coli bgl operon downstream of the promoter. Mol Microbiol 52:589–600
Dorman CJ (2004) H-NS: a universal regulator for a dynamic genome. Nat Rev Microbiol 2:391–400
Dorman CJ, Deighan P (2003) Regulation of gene expression by histone-like proteins in bacteria. Curr Opin Genet Dev 13:179–184
Dorman CJ, Hinton JCD, Free A (1999) Domain organization and oligomerization among H-NS-like nucleoid-associated proteins in bacteria. Trends Microbiol 7:124–128
Du Z, Geider K (2002) Characterization of an activator gene upstream of lsc, involved in levan synthesis of Erwinia amylovora. Physiol Mol Plant Pathol 60:9–17
Eastgate JA, Taylor N, Coleman MJ, Healy B, Thompson L, Roberts IS (1995) Cloning, expression and characterisation of the lon gene of Erwinia amylovora: Evidence for a heat-shock response. J Bacteriol 177:932–937
Falkenstein H, Bellemann P, Walter S, Zeller W, Geider K (1988) Identification of the fire blight pathogen Erwinia amylovora, by colony hybridization with DNA from plasmid pEA29. Appl Environ Microbiol 54:2798–2802
Falkenstein H, Zeller W, Geider K (1989) The 29 kb plasmid, common in strains of Erwinia amylovora, modulates development of fire blight symptoms. J Gen Microbiol 135:2643–2650
Geider K, Baldes R, Bellemann P, Metzger M, Schwartz T (1995) Mutual adaptation of bacteriophage fd, pfd plasmids and their host strains. Microbiol Res 150:337–346
Geider K, Hohmeyer C, Haas R, Meyer TF (1985) A plasmid cloning system utilising replication and packaging functions of the filamentous bacteriophage fd. Gene 33:341–349
Geier G, Geider K (1993) Characterization and influence on virulence of the levansucrase gene from the fire blight pathogen Erwinia amylovora. Physiol Mol Plant Pathol 42:387–404
Gottesman S (1995) Regulation of capsule synthesis: modification of the two-component paradigm by an accessory unstable regulator. In: Hoch JA, Silhavy TJ (eds) Two-component signal transduction. ASM Press, Washington, pp 253–262
Higgins CF, Hinton JC, Hulton CS, Owen-Hughes T, Pavitt GD, Seirafi A (1990) Protein H1: a role for chromatin structure in the regulation of bacterial gene expression and virulence? Mol Microbiol 4:2007–2012
Hommais F, Krin E, Laurent-Winter C, Soutourina O, Malpertuy A, Le Caer J P, Danchin A, Bertin P (2001) Large-scale monitoring of pleiotropic regulation of gene expression by the prokaryotic nucleoid-associated protein, H-NS. Mol Microbiol 40:20–36
Jaquet M, Cukier-Kahn R, Pla J, Gros F (1971) A thermostable protein factor acting on in vitro DNA transcription. Biochem Biophys Res Commun 45:1597–1607
Johansson J, Uhlin BE (1999) Differential protease-mediated turnover of H-NS and StpA revealed by a mutation altering protein stability and stationary phase suvival of Escherichia coli. Proc Natl Acad Sci USA 96:10776–10781
Kim JF, Beer SV (2000) hrp genes and harpins of Erwinia amylovora: a decade of discovery. In: Vanneste J (ed) Fire blight: the disease and its causative agent Erwinia amylovora. CABI Publishing, Wallingford, pp 117–140
Lucht JM, Dersch P, Kempf B, Bremer E (1994) Interactions of the nucleoid-associated DNA-binding protein H-NS with the regulatory region of the osmotically controlled proU operon of Escherichia coli. J Biol Chem 269:6578–6578
Maxson-Stein K, McGhee GC, Smith JJ, Jones AL, Sundin GW (2003) Genetic analysis of a pathogenic Erwinia sp. isolated from pear in Japan. Phytopathology 93:1393–1399
McGhee GC, Jones AL (2000) Complete nucleotide sequence of ubiquitous plasmid pEA29 from Erwinia amylovora strain Ea88: Gene organization and intraspecies variation. Appl Environ Microbiol 66:4897–4907
Mojica FJ, Higgins CF (1997) In vivo supercoiling of plasmid and chromosomal DNA in an Escherichia coli hns mutant. J Bacteriol 179:3528–3533
Owen-Hughes TA, Pavitt GD, Santos DS, Sidebotham JM, Hulton CS, Hinton JC, Higgins CF (1992) The chromatin-associated protein H-NS interacts with curved DNA to influence DNA topology and gene expression. Cell 71:255–265
Rimsky S, Zuber F, Buckle M, Buc H (2001) A molecular mechanism for the repression of transcription by the H-NS protein. Mol Microbiol 42:1311–1323
Sambrook J, Rusell W (2001) Molecular cloning: a laboratory manual, 3rd edn. Cold Spring Harbor Laboratory Press, Cold Spring Harbor
Shpigelman ES, Trifonov EN, Bolshoy A (1993) Curvature—software for the analysis of curved DNA. Comput Appl Biosci 9:435–440
Sonnenfield JM, Burns CM, Higgins CF, Hinton JCD (2001) The nucleoid-assiciated protein StpA binds curved DNA, has a greater DNA-binding affinity than H-NS and is present in significant levels in hns mutants. Biochimie 83:243–249
Spratt BG, Hedge PJ, te Heesen S, Edelman A, Broome-Smith JK (1986) Kanamycin-resistant vectors that are analogues of plasmids pUC8, pUC9, pEMBL8 and pEMBL9. Gene 41:337–342
Tupper AE, Owen-Hughes TA, Ussery DW, Santos DS, Ferguson DJ, Sidebotham J, Hinton JC, Higgins CF (1994) The chromatin-associated protein H-NS alters DNA topology in vitro. EMBO J 13:258–268
Vanneste JL (2000) Fire blight: the disease and its causative agent Erwinia amylovora. CABI Publishing, Wallingford
Varshavsky AJ, Nedospasov SA, Bakayev VV, Bakayeva TG, Georgiev GP (1977) Histone-like proteins in the purified Escherichia coli deoxyribonucleoprotein. Nucleic Acids Res 4:2725–2745
Wang RF, Kushner SR (1991) Construction of versatile low-copy-number vectors for cloning, sequencing and gene expression in Escherichia coli. Gene 100:195–199
Wei ZM, Sneath BJ, Beer SV (1992) Expression of Erwinia amylovora hrp genes in response to environmental stimuli. J Bacteriol 174:1875–1882
Westermark M, Oscarsson J, Mizunoe Y, Urbonaviciene J, Uhlin BE (2000) Silencing and activation of ClyA cytotoxin expression in Escherichia coli. J Bacteriol 182:6347–6357
Yang J, Tauschek M, Strugnell R, Robins-Browne RM (2005) The H-NS protein represses transcription of the eltAB operon, which encodes heat-labile enterotoxin in enterotoxigenic Escherichia coli, by binding to regions downstream of the promoter. Microbiology 151:1199–1208
Acknowledgements
We thank S. Jock for a series of experiments to cure cells from pEA29 and B. Schneider for comments on the manuscript.
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Communicated by A. Kondorosi
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Hildebrand, M., Aldridge, P. & Geider, K. Characterization of hns genes from Erwinia amylovora . Mol Genet Genomics 275, 310–319 (2006). https://doi.org/10.1007/s00438-005-0085-5
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DOI: https://doi.org/10.1007/s00438-005-0085-5