Helicobacter spp.

  • Douglas I. Johnson
Chapter

Abstract

  • Genomics:
    • Helicobacter pylori chromosome: 1,667,867 bp; 1,590 predicted ORFs (Tomb et al. 1997)

  • Cell morphology:
    • Small, helical or curved, rod-shaped cells (Fig. 18.1)

    • Flagella: four to six lophotrichous flagella
      • Motility is essential for virulence (see below).

      • Two copolymerized flagellin proteins: FlaA and FlaB.

    • LPS: has fucose-containing O-antigens
      • Mimics Lewis b-like blood group antigens

      • Plays a role in cell adherence (see below)

      • Can undergo phase variation to elude immune system (Salaun et al. 2004)

  • Gram stain:
    • Gram negative

  • Growth:
    • Microaerophilic; oxidase positive, catalase positive, urease positive (see below)

    • Normal reservoir: stomach and upper gastrointestinal tract

    • Biofilm formation: can form on abiotic surfaces and on gastric epithelial cells; under the regulation of the ArsR–ArsS TCS (Servetas et al. 2016; Stark et al. 1999)

    • ~23 species – classified as either gastric species or enterohepatic species:
      • Helicobacter pylori is the primary human pathogen.

      • Highly heterogeneous bacteria; probably due to coevolution with humans, its only ecological niche, and horizontal gene transfer events.

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Copyright information

© Springer International Publishing AG 2018

Authors and Affiliations

  • Douglas I. Johnson
    • 1
  1. 1.Department of Microbiology & Molecular GeneticsUniversity of VermontBurlingtonUSA

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