Related Experiment Video

Updated: Aug 12, 2026

The MUB40 Peptide for Use in Detecting Neutrophil-Mediated Inflammation Events
06:48

The MUB40 Peptide for Use in Detecting Neutrophil-Mediated Inflammation Events

Published on: January 7, 2019

Mammalian peptidoglycan recognition protein binds peptidoglycan with high affinity, is expressed in neutrophils, and

C Liu1, E Gelius, G Liu

  • 1Northwest Center for Medical Education, Indiana University School of Medicine, Gary, Indiana 46408, USA.

The Journal of Biological Chemistry
|May 29, 2000
PubMed

Insights

Mammalian Peptidoglycan Recognition Protein (PGRP) binds bacterial peptidoglycan with high affinity. This protein, found in neutrophils, inhibits Gram-positive bacterial growth and modulates immune responses.

Area of Science:

  • Immunology
  • Microbiology
  • Biochemistry

Background:

  • Peptidoglycan Recognition Proteins (PGRPs) are conserved immune molecules.
  • In insects, PGRPs activate antimicrobial defense pathways.
  • The function of mammalian PGRPs remains largely unknown.

Purpose of the Study:

  • To elucidate the function of mammalian Peptidoglycan Recognition Protein (PGRP).
  • To investigate the binding characteristics and immune modulatory roles of mouse PGRP.

Main Methods:

  • Binding assays to determine affinity and specificity for peptidoglycan (PGN).
  • Expression analysis of PGRP mRNA and protein in various immune cells.
  • Functional assays assessing PGRP's effects on bacterial growth, phagocytosis, oxidative burst, and cytokine production.

Main Results:

  • Mouse PGRP exhibits high-affinity, specific binding to polymeric PGN and Gram-positive bacteria.
  • PGRP is expressed in neutrophils and bone marrow cells.
  • PGRP inhibits Gram-positive bacterial growth, macrophage phagocytosis, neutrophil oxidative burst, and PGN-induced cytokine production.

Conclusions:

  • Mammalian PGRP specifically binds PGN and Gram-positive bacteria.
  • PGRP plays a role in innate immunity by modulating bacterial interactions and immune cell responses.
  • PGRP is expressed in neutrophils and inhibits bacterial growth, suggesting a direct role in host defense.

More Related Videos

Semi-Quantitative Analysis of Peptidoglycan by Liquid Chromatography Mass Spectrometry and Bioinformatics09:09

Semi-Quantitative Analysis of Peptidoglycan by Liquid Chromatography Mass Spectrometry and Bioinformatics

Published on: October 13, 2020

Synthesis of Masarimycin, a Small Molecule Inhibitor of Gram-Positive Bacterial Growth09:10

Synthesis of Masarimycin, a Small Molecule Inhibitor of Gram-Positive Bacterial Growth

Published on: January 7, 2022

Related Concept Videos

Cytoskeletal Proteins in Bacteria01:29

Cytoskeletal Proteins in Bacteria

Bacterial cells were initially considered simple, randomly organized structures lacking a cytoskeleton. However, the discovery of cytoskeleton homologs in bacteria led to the change of this opinion. Bacterial cytoskeletal filaments regulate the cell shape, cell polarity, cell division, and partitioning of plasmids during cell division. It was later discovered that bacterial cytoskeletal proteins, mainly actin and tubulin homologs, are diverse compared to their eukaryotic counterparts. On the...
Antimicrobial Proteins01:23

Antimicrobial 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...
Bacterial Cell Wall01:22

Bacterial Cell Wall

The bacterial cell wall is an essential structural component that encases the plasma membrane, preserving cellular integrity, determining shape, and protecting against osmotic stress. This rigid yet flexible structure primarily comprises peptidoglycan, a polymer that forms a mesh-like matrix conferring mechanical strength and flexibility.Peptidoglycan Composition and StructurePeptidoglycan, the core of the bacterial cell wall, comprises alternating units of N-acetylglucosamine (NAG) and...
Peptidoglycan Synthesis01:28

Peptidoglycan Synthesis

Structure of PeptidoglycanPeptidoglycan is a vital structural component of the bacterial cell wall, providing mechanical strength and shape to the cell. It consists of repeating units of two sugars—N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM)—linked by β-1,4 glycosidic bonds. These sugar chains are cross-linked by short peptide chains, forming a mesh-like polymer that surrounds the bacterial plasma membrane.Cytoplasmic Phase – Precursor SynthesisPeptidoglycan biosynthesis begins in...
Stringent Response in E. coli01:23

Stringent Response in E. coli

Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
Inhibitors of Gram-positive Cell Wall Synthesis01:23

Inhibitors of Gram-positive Cell Wall Synthesis

Bacterial cell walls are typically rigid structures composed mainly of peptidoglycan, a mesh-like polymer that provides mechanical strength and maintains cell shape. The synthesis of peptidoglycan is a crucial process in bacterial growth and serves as a primary target for many antibiotics.Mechanism of Action of Beta-Lactam AntibioticsBeta-lactam antibiotics, such as penicillin, inhibit peptidoglycan synthesis in actively growing cells. These antibiotics share a characteristic four-membered...