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Related Concept Videos

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Reporter genes are a type of protein-coding gene that are often tagged to a gene of interest. Once inside a target cell, reporter genes usually produce visually identifiable characteristics like fluorescence and luminescence when expressed along with the gene of interest. Thus, reporter genes “report” the presence or absence of genes of interest in an organism, determine the gene expression pattern, or track the physical location of a DNA segment or protein in the cell.
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Mapping Bacterial Functional Networks and Pathways in Escherichia Coli using Synthetic Genetic Arrays
14:06

Mapping Bacterial Functional Networks and Pathways in Escherichia Coli using Synthetic Genetic Arrays

Published on: November 12, 2012

Mapping the selection mechanisms by bacterial GEFs.

Zhiwei Huang1, Jijie Chai

  • 1National Institute of Biological Sciences, Beijing, China.

Virulence
|December 24, 2010
PubMed
Summary
This summary is machine-generated.

Bacterial pathogens like E. coli use effector proteins to mimic host enzymes. This study reveals that the E. coli Map protein and its relatives function as guanine nucleotide exchange factors (GEFs), manipulating host cell signaling.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Bacterial pathogens often mimic host enzymes to disrupt cellular signaling.
  • The E. coli type III effector protein Map is a virulence factor that activates host Rho GTPase signaling via an unknown mechanism.

Purpose of the Study:

  • To elucidate the molecular mechanism by which Map and related bacterial proteins manipulate host Rho GTPase signaling.
  • To determine if these bacterial proteins function as mimics of host signaling enzymes.

Main Methods:

  • Structural biology (X-ray crystallography)
  • Biochemical assays
  • Functional cellular assays

Main Results:

  • The study establishes that Map, IpgB1/2 (Shigella), and SifA/B (Salmonella) act as functional mimics of mammalian guanine nucleotide exchange factors (GEFs).
  • A conserved mechanism for GTPase isoform selection between bacterial GEF mimics and human Dbl GEFs was identified.

Conclusions:

  • Bacterial effector proteins like Map have evolved to functionally mimic host GEFs, representing a sophisticated strategy for host manipulation.
  • The findings reveal an evolutionary dynamic of protein mimicry and provide insights into host-pathogen interactions.