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Related Concept Videos

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Related Experiment Video

Updated: Jun 29, 2025

Identification of Protein Complexes in Escherichia coli using Sequential Peptide Affinity Purification in Combination with Tandem Mass Spectrometry
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DnaK duplication and specialization in bacteria correlates with increased proteome complexity.

Zhuo Pan1, Li Zhuo1,2, Tian-Yu Wan1

  • 1State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, China.

Msystems
|March 26, 2024
PubMed
Summary

Bacterial DnaK (70 kDa heat shock protein) duplication correlates with proteomic complexity. Two DnaK paralogs in Myxococcus xanthus evolved distinct functions, binding different proteins, driven by domain evolution to manage complex proteomes.

Keywords:
DnaKMyxococcus xanthus DK1622duplicationinter-swappingprokaryotesproteomic complexitysubstrate spectrum

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Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Microbiology

Background:

  • The 70 kDa heat shock protein (Hsp70) family, including bacterial DnaK, is crucial for maintaining proteostasis across all life forms.
  • While Hsp70 mechanisms are understood, the functional diversification and evolutionary paths of Hsp70 paralogs, especially in bacteria, remain less explored.
  • DnaK is a highly conserved Hsp70 in bacteria, with some species possessing multiple paralogs.

Purpose of the Study:

  • To investigate the correlation between DnaK gene duplication and proteomic complexity in bacteria.
  • To characterize the distinct functions and substrate specificities of DnaK paralogs in *Myxococcus xanthus*.
  • To identify the protein domains responsible for functional divergence between DnaK paralogs.

Main Methods:

  • Bioinformatic analysis of bacterial genomes to assess DnaK presence and duplication frequency.
  • Proteomic analysis to identify and compare the interactomes of *Myxococcus xanthus* DnaK paralogs (MxDnaKs) and *Escherichia coli* DnaK.
  • Domain-swapping experiments to determine the role of specific DnaK domains in substrate binding and functional divergence.

Main Results:

  • DnaK is present in 98.9% of bacterial genomes, with 6.4% having multiple paralogs, positively correlating with proteomic complexity.
  • The two MxDnaKs exhibit largely non-overlapping substrate preferences, with MxDnaK1 (upregulated by heat shock) binding cytosolic proteins and MxDnaK2 (downregulated by heat shock) associated with membrane proteins.
  • Domain swapping revealed that the nucleotide-binding domain and the β substrate-binding domain are critical for the functional divergence and differential substrate specificity of MxDnaKs.

Conclusions:

  • Bacterial DnaK duplication is an evolutionary strategy to cope with increasing proteomic complexity.
  • DnaK paralogs can evolve distinct substrate specificities and functions, mediated by specific protein domains.
  • This study provides direct evidence for regional evolution driving functional diversification within bacterial Hsp70 paralogs.