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Related Experiment Videos

Human and yeast Hsp110 chaperones exhibit functional differences.

Holger Raviol1, Bernd Bukau, Matthias P Mayer

  • 1Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), Im Neuenheimer Feld 282, Heidelberg, Germany.

FEBS Letters
|December 21, 2005
PubMed
Summary
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Hsp110 proteins, like Sse1 and Apg-2, show distinct biochemical properties and ATPase activities. These differences in molecular chaperones may explain their varied roles in cellular functions.

Area of Science:

  • Molecular biology
  • Biochemistry
  • Cell biology

Background:

  • Hsp110 proteins are abundant cytosolic molecular chaperones in eukaryotes, related to Hsp70 proteins.
  • They function as holdases, preventing protein aggregation and aiding refolding of denatured substrates with Hsp70 co-chaperones.

Purpose of the Study:

  • To compare the structural and functional properties of two Hsp110 homologues, S. cerevisiae Sse1 and H. sapiens Apg-2, in vitro.
  • To elucidate the mode of action and biochemical differences within the Hsp110 protein family.

Main Methods:

  • In vitro biochemical assays comparing Sse1 and Apg-2.
  • Analysis of intrinsic ATPase activities and stimulation by Hsp40 co-chaperones (Sis1).
  • Detection of conformational rearrangements via tryptophan fluorescence and proteolytic digestion patterns upon nucleotide binding.

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Main Results:

  • Both Sse1 and Apg-2 exhibit intrinsic ATPase activity, unlike previous reports.
  • Only Sse1's ATPase activity is stimulated by the Hsp40 co-chaperone Sis1.
  • ATP binding and hydrolysis induce conformational changes in both proteins, but nucleotide-induced proteolytic pattern changes are specific to Sse1.

Conclusions:

  • Sse1 and Apg-2 display significant biochemical differences in their ATPase activity and conformational dynamics.
  • These distinct properties suggest specialized functional roles for different Hsp110 subtypes in vivo.