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Updated: Jun 16, 2026

High Resolution Electron Microscopy of the Helicobacter pylori Cag Type IV Secretion System Pili Produced in Varying Conditions of Iron Availability
09:05

High Resolution Electron Microscopy of the Helicobacter pylori Cag Type IV Secretion System Pili Produced in Varying Conditions of Iron Availability

Published on: November 21, 2014

Unique host iron utilization mechanisms of Helicobacter pylori revealed with iron-deficient chemically defined media

Olga Senkovich1, Shantelle Ceaser, David J McGee

  • 1Louisiana State University Health Sciences Center-Shreveport, Department of Microbiology & Immunology, 1501 Kings Highway, Shreveport, LA 71130, USA.

Infection and Immunity
|February 24, 2010
PubMed

Insights

Helicobacter pylori can utilize iron from hemoglobin, transferrin, and lactoferrin. This bacterium has a unique strategy for iron acquisition, potentially aiding its chronic gastric colonization.

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Gastroenterology

Background:

  • Helicobacter pylori is a bacterium that chronically infects the stomach lining.
  • Iron is essential for H. pylori growth, but its in vivo sources remain unclear.
  • Previous research was limited by the inability to culture H. pylori without serum.

Purpose of the Study:

  • To investigate the iron sources utilized by H. pylori in vitro.
  • To determine if H. pylori can extract iron from specific host proteins.

Main Methods:

  • Culturing H. pylori in iron-deficient, chemically defined medium.
  • Assessing H. pylori's ability to bind and extract iron from hemoglobin, transferrin, and lactoferrin.

Main Results:

  • H. pylori successfully bound and extracted iron from hemoglobin, transferrin, and lactoferrin.
  • Both human and bovine forms of transferrin and lactoferrin were utilized.
  • H. pylori preferentially binds iron-free transferrin and lactoferrin, unlike other pathogens.

Conclusions:

  • H. pylori can acquire iron from multiple host proteins.
  • This unique iron-binding strategy may facilitate persistent gastric colonization.
  • The mechanism may prevent excessive host injury and iron depletion during infection.

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