1ji4

Structural highlights

Function

[DPS_HELPY] Protects DNA from oxidative damage by sequestering intracellular Fe(2+) ion and storing it in the form of Fe(3+) oxyhydroxide mineral. One hydrogen peroxide oxidizes two Fe(2+) ions, which prevents hydroxyl radical production by the Fenton reaction (By similarity). Required for the survival in the presence of oxidative stress. Dps is also a virulence factor that activates neutrophils, mast cells and monocytes. It binds to neutrophil-glycosphingolipids and to sulfated carbohydrates on mucin. It might have a role in the accumulation of neutrophils and monocytes at the site of infection. Induces superoxide anion generation, adhesion and chemotaxis of neutrophils, through a pertussis toxin-sensitive pathway involving MAP kinases.^{[1] [2] [3] [4] [5] [6]}

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

See Also

• Ferritin

References

1. ↑ Leakey A, La Brooy J, Hirst R. The ability of Helicobacter pylori to activate neutrophils is determined by factors other than H. pylori neutrophil-activating protein. J Infect Dis. 2000 Dec;182(6):1749-55. Epub 2000 Oct 26. PMID:11069248 doi:http://dx.doi.org/JID000555
2. ↑ Evans DJ Jr, Evans DG, Takemura T, Nakano H, Lampert HC, Graham DY, Granger DN, Kvietys PR. Characterization of a Helicobacter pylori neutrophil-activating protein. Infect Immun. 1995 Jun;63(6):2213-20. PMID:7768601
3. ↑ Satin B, Del Giudice G, Della Bianca V, Dusi S, Laudanna C, Tonello F, Kelleher D, Rappuoli R, Montecucco C, Rossi F. The neutrophil-activating protein (HP-NAP) of Helicobacter pylori is a protective antigen and a major virulence factor. J Exp Med. 2000 May 1;191(9):1467-76. PMID:10790422
4. ↑ Montemurro P, Nishioka H, Dundon WG, de Bernard M, Del Giudice G, Rappuoli R, Montecucco C. The neutrophil-activating protein (HP-NAP) of Helicobacter pylori is a potent stimulant of mast cells. Eur J Immunol. 2002 Mar;32(3):671-6. PMID:11857341 doi:http://dx.doi.org/10.1002/1521-4141(200203)32:3<671::AID-IMMU671>3.0.CO;2-5
5. ↑ Nishioka H, Baesso I, Semenzato G, Trentin L, Rappuoli R, Del Giudice G, Montecucco C. The neutrophil-activating protein of Helicobacter pylori (HP-NAP) activates the MAPK pathway in human neutrophils. Eur J Immunol. 2003 Apr;33(4):840-9. PMID:12672049 doi:http://dx.doi.org/10.1002/eji.200323726
6. ↑ Cooksley C, Jenks PJ, Green A, Cockayne A, Logan RP, Hardie KR. NapA protects Helicobacter pylori from oxidative stress damage, and its production is influenced by the ferric uptake regulator. J Med Microbiol. 2003 Jun;52(Pt 6):461-9. PMID:12748264
7. ↑ Zanotti G, Papinutto E, Dundon W, Battistutta R, Seveso M, Giudice G, Rappuoli R, Montecucco C. Structure of the neutrophil-activating protein from Helicobacter pylori. J Mol Biol. 2002 Oct 11;323(1):125-30. PMID:12368104