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Related Concept Videos

Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
Coordination of Gene Expression Processes in Bacteria01:29

Coordination of Gene Expression Processes in Bacteria

The DNA replication, transcription, and translation processes are intricately coupled in bacteria, allowing efficient gene expression and rapid protein synthesis. While this physical and functional coordination is advantageous, it introduces challenges that bacteria overcome through specific regulatory mechanisms.Coupling of Replication, Transcription, and TranslationThe coupling of replication, transcription, and translation is a hallmark of bacterial gene expression. As the replisome unwinds...
Types of RNA01:23

Types of RNA

Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
Evolution of Microbial Genome01:08

Evolution of Microbial Genome

Microbial genome evolution is a highly dynamic process shaped by continual gene gain and loss across species and strains. This genomic flexibility allows microorganisms to adapt rapidly to environmental pressures and interactions with other organisms. Central to understanding this diversity is the distinction between the core and pan genomes.The core genome comprises the genes shared by all sampled strains of a species, representing essential functions needed for fundamental cellular processes.
Translational Regulation01:29

Translational Regulation

Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
Bacterial Protein Maturation01:26

Bacterial Protein Maturation

Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...

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Related Experiment Video

Updated: May 17, 2026

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

Genome reduction promotes increase in protein functional complexity in bacteria.

Yogeshwar D Kelkar1, Howard Ochman

  • 1Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT 06520, USA.

Genetics
|November 2, 2012
PubMed
Summary

Bacteria with smaller genomes develop greater functional complexity by having proteins perform multiple roles to compensate for gene loss. This protein multitasking helps these organisms survive despite reduced genetic material.

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Last Updated: May 17, 2026

Mapping Bacterial Functional Networks and Pathways in Escherichia Coli using Synthetic Genetic Arrays
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Identification of Protein Complexes in Escherichia coli using Sequential Peptide Affinity Purification in Combination with Tandem Mass Spectrometry
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The Multifaceted Benefits of Protein Co-expression in Escherichia coli
12:48

The Multifaceted Benefits of Protein Co-expression in Escherichia coli

Published on: February 5, 2015

Area of Science:

  • Microbiology
  • Genomics
  • Evolutionary Biology

Background:

  • Obligate pathogenic and endosymbiotic bacteria undergo significant gene loss due to factors like functional redundancy, asexuality, and genetic drift.
  • This gene loss can impact the bacteria's ability to survive and thrive in their respective environments.

Purpose of the Study:

  • To investigate the hypothesis that reduced bacterial genomes increase functional complexity through protein multitasking.
  • To understand how surviving proteins in smaller genomes adapt to compensate for lost genes.

Main Methods:

  • Comparative analysis of interaction networks across six bacteria with varying genome sizes: Mycoplasma pneumoniae, Treponema pallidum, Helicobacter pylori, Campylobacter jejuni, Synechocystis sp., and Mycobacterium tuberculosis.
  • Examination of protein interaction breadth and functional diversity in relation to genome size.

Main Results:

  • Proteins within smaller bacterial genomes exhibit interactions with a broader spectrum of functions compared to their orthologs in larger genomes.
  • This indicates that surviving proteins in reduced genomes engage in more diverse functional relationships.

Conclusions:

  • Reduced bacterial genomes enhance functional complexity via protein multitasking, where individual proteins adopt multiple roles.
  • The observed complex functional relationships among proteins in small genomes serve as a compensatory mechanism for gene loss, facilitating bacterial survival.