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Related Concept Videos

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Defense Against Bacterial Pathogens

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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
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The human body carefully regulates the internal pH of different organs to maintain homeostasis. For example, while the blood plasma maintains a neutral pH of 7, the stomach lumen has an acidic pH of 1.5 - 3.5. The low pH of stomach lumen helps kill pathogens in the food and break down complex food molecules.
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In the complex environment of the gastric lumen, excessive acid secretion can lead to the formation or worsening of ulcers within the delicate mucosal layer. Antacids, such as sodium bicarbonate and calcium carbonate, provide relief by neutralizing this acid, transforming it into harmless salt and water. This neutralization process raises the gastric pH from a highly acidic level of 1 to a more basic 3-4, reducing the acidity within the stomach.
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Acids, Bases and Neutralization Reactions01:27

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Acids and bases play several important roles in biology. The pH of a biological system can significantly impact the function of biological molecules, including enzymes, proteins, and nucleic acids. For example, enzymes have optimal pH ranges for their activity, and changes in pH can denature or alter their structure, affecting their function. Acids and bases also play a crucial role in cellular signaling and communication. The pH of the extracellular fluid around cells can influence the...
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Defense Mechanism Against Infection01:26

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Natural flora, body system defenses, and inflammation are natural barriers of the body against infectious agents regardless of previous exposure. Normal floras of the human body refer to the microbial population that colonizes the skin and mucous membranes.
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Peptic ulcers, often induced by H. pylori infections or NSAID usage, arise from disruptions in the delicate balance of gastric acid production. Peptic ulcers stem from heightened gastric acid levels due to H. pylori infections or NSAID use. The protective mucus layer diminishes in the presence of these factors, allowing gastric acid to erode the stomach lining and form ulcers.
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Updated: Sep 3, 2025

Detection of the pH-dependent Activity of Escherichia coli Chaperone HdeB In Vitro and In Vivo
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Bacterial battle against acidity.

Julia Schwarz1, Kilian Schumacher1, Sophie Brameyer1

  • 1Faculty of Biology, Microbiology, Ludwig-Maximilians-University München, Großhaderner Str. 2-4, 82152 Martinsried, Germany.

FEMS Microbiology Reviews
|July 29, 2022
PubMed
Summary
This summary is machine-generated.

Acid-resistant Gram-negative bacteria survive low pH environments using defense mechanisms like proton consumption and cellular remodeling. These bacteria sense acidity via pH sensors and employ decarboxylase systems for population-level survival.

Keywords:
Gram-negative bacteriaglutamate acid-dependent acid resistancelysine-dependent acid resistancepH-sensorprotons

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Area of Science:

  • Microbiology and Environmental Science

Background:

  • Many environments on Earth, such as vertebrate gastrointestinal tracts and acidic soils, are characterized by low pH.
  • While most bacteria are neutralophiles, they possess mechanisms to survive fluctuations in pH.

Approach:

  • This review examines the adaptive strategies of acid-resistant Gram-negative bacteria, including Escherichia, Salmonella, Helicobacter, and Brucella.
  • It discusses constitutive and inducible defense mechanisms, such as proton consumption, ammonia production, cellular remodeling, and chemotaxis.
  • The review also explores how these bacteria sense environmental acidity using membrane-integrated and cytosolic pH sensors.

Key Points:

  • Gram-negative bacteria employ diverse strategies to adapt to acidic conditions.
  • Proton-consuming decarboxylase systems are highlighted as powerful survival mechanisms.
  • Understanding these adaptations is crucial for various fields, from medicine to environmental science.

Conclusions:

  • Gram-negative bacteria exhibit remarkable resilience in acidic environments through sophisticated defense and sensing mechanisms.
  • Decarboxylase systems play a significant role in the collective survival of bacterial populations under acid stress.