Related Experiment Video
Updated: May 19, 2026
10:59
Enrichment of Bacterial Lipoproteins and Preparation of N-terminal Lipopeptides for Structural Determination by Mass Spectrometry
Published on: May 21, 2018
The iron-regulated staphylococcal lipoproteins.
Jessica R Sheldon1, David E Heinrichs
1Department of Microbiology and Immunology, Western University, London ON, Canada.
Frontiers in Cellular and Infection Microbiology
|August 25, 2012
Summary
Iron-regulated lipoproteins in staphylococci are crucial for nutrient acquisition and virulence. These lipoproteins also trigger immune responses via Toll-like receptor-2 (TLR2), particularly during iron starvation.
Area of Science:
- Microbiology
- Immunology
- Biochemistry
Background:
- Lipoproteins are essential bacterial proteins involved in nutrient uptake, adhesion, and virulence.
- In staphylococci, specific lipoproteins are regulated by iron availability and play a key role in iron acquisition.
- These iron-regulated lipoproteins are also potent activators of the host innate immune system.
Purpose of the Study:
- To review the biogenesis and function of iron-regulated staphylococcal lipoproteins.
- To examine the substrate specificity of these lipoproteins in nutrient acquisition.
- To discuss the impact of iron-regulated lipoproteins on the host innate immune response.
Main Methods:
- Literature review focusing on staphylococcal lipoproteins.
- Analysis of studies on lipoprotein biogenesis and function.
- Examination of research on lipoprotein-mediated immune activation.
Main Results:
- Iron-regulated lipoproteins in staphylococci are upregulated during iron starvation.
- These lipoproteins function as substrate-binding proteins (SBPs) for ABC transporters, facilitating iron uptake.
- Iron-regulated lipoproteins are highly immunogenic and activate Toll-like receptor-2 (TLR2)-mediated immune responses.
Conclusions:
- Iron-regulated staphylococcal lipoproteins are critical for bacterial survival under iron-limiting conditions.
- Their role in iron acquisition contributes to staphylococcal pathogenesis and virulence.
- These lipoproteins represent significant targets for modulating host immune responses and understanding bacterial infections.
Related Concept Videos
01:19Formation of Lipopolysaccharides
Lipopolysaccharides (LPS) are crucial components of the outer membrane of Gram-negative bacteria, serving both structural and functional roles. It contributes to membrane stability and protects bacteria from host immune responses. LPS is composed of three major regions—lipid A, a core oligosaccharide, and an O antigen. The biosynthesis and assembly of LPS involve a highly coordinated set of enzymatic reactions and transport mechanisms. Additionally, LPS is recognized as an endotoxin, triggering...
01:23Antimicrobial Proteins
Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...
01:29Staphylococcal Skin Infections
Staphylococcus aureus is a Gram-positive coccus that resides harmlessly on the skin and mucous membranes of healthy individuals. When the skin barrier is breached, it can shift from a commensal to an opportunistic pathogen. This transition is facilitated by surface adhesins, such as clumping factor B and S. aureus surface protein G (SasG), which bind to structural proteins, including loricrin and cytokeratin, in the damaged epidermis. Protein A, another key factor, binds the Fc region of...
01:38Receptor-mediated Endocytosis
Overview
01:29Biosynthesis of Lipids
Microbial membranes exhibit remarkable diversity in lipid composition, reflecting evolutionary adaptations to various environmental conditions. The three domains of life—Bacteria, Archaea, and Eukarya—synthesize membrane lipids through distinct biosynthetic pathways, leading to fundamental structural differences that impact membrane stability, function, and adaptability.Fatty Acid-Based Lipids in Bacteria and EukaryaBacteria and eukaryotes share a common fatty acid biosynthesis pathway, which...
01:45Regulation of Nuclear Protein Sorting
Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...