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Related Concept Videos

Factors Affecting Activity Coefficient01:17

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The extended Debye-Hückel equation indicates that the activity coefficient of an ion in an aqueous solution at 25°C depends on three partially interdependent properties: the ionic strength of the solution, the charge of the ion, and the ion size. 
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In Situ Monitoring of Transiently Formed Molecular Chaperone Assemblies in Bacteria, Yeast, and Human Cells
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ClpL is a chaperone without auxiliary factors.

Sang-Sang Park1, Hyog-Young Kwon, Thao Dang-Hien Tran

  • 1School of Pharmacy, Sungkyunkwan University, Suwon, Korea.

The FEBS Journal
|February 10, 2015
PubMed
Summary

Streptococcus pneumoniae ClpL, a heat shock protein (Hsp)100 member, functions as a manganese-dependent chaperone. This unique protein exhibits chaperone activity independently of co-chaperones.

Keywords:
ClpLHsp 100 familyNTPase activityStreptococcus pneumoniaechaperone

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Microbiology

Background:

  • Caseinolytic protease L (ClpL) is a significant heat shock protein (HSP) in Gram-positive bacteria, particularly Streptococcus pneumoniae.
  • HSP100 family proteins are crucial for cellular protein homeostasis, often requiring co-chaperones for their function.

Discussion:

  • This study details the in vitro biochemical characterization of recombinant ClpL from Streptococcus pneumoniae.
  • ClpL demonstrates nucleotide hydrolase, refolding, holdase, and disaggregation activities, functioning with either Mg(2+) or Mn(2+), and notably, without the DnaK system.
  • Distinctive features include Mn(2+)-enhanced hydrolase and chaperone activities, and intrinsic NTPase activity, differentiating it from other HSP100 members.

Key Insights:

  • ClpL forms a hexamer in the presence of nucleotides (ADP, ATP, ATP-γ-S).
  • Mutational analysis of Walker A motifs confirms their essential role in chaperone activity, ATP hydrolysis, and hexamerization.
  • Pneumococcal ClpL is a unique Mn(2+)-dependent HSP100 protein capable of chaperone activity without co-chaperone assistance.

Outlook:

  • Further investigation into the structural basis of Mn(2+) dependence and its implications for bacterial protein quality control.
  • Exploring the therapeutic potential of targeting ClpL in Streptococcus pneumoniae infections.
  • Comparative studies with other bacterial HSP100 proteins to elucidate conserved and unique mechanisms.