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The charged region of Hsp90 modulates the function of the N-terminal domain

Titelangaben

Scheibel, Thomas ; Siegmund, Heiko Ingo ; Jaenicke, Rainer ; Ganz, Peter ; Lilie, Hauke ; Buchner, Johannes:
The charged region of Hsp90 modulates the function of the N-terminal domain.
In: Proceedings of the National Academy of Sciences of the United States of America. Bd. 96 (Februar 1999) Heft 4 . - S. 1297-1302.
ISSN 1091-6490
DOI: https://doi.org/10.1073/pnas.96.4.1297

Abstract

Hsp90, an abundant heat shock protein that is highly expressed even under physiological conditions, is involved in the folding of key molecules of the cellular signal transduction system such as kinases and steroid receptors. It seems to contain two chaperone sites differing in substrate specificity. Binding of ATP or the antitumor drug geldanamycin alters the substrate affinity of the N-terminal chaperone site, whereas both substances show no influence on the C-terminal one. In wild-type Hsp90 the fragments containing the chaperone sites are connected by a highly charged linker of various lengths in different organisms. As this linker region represents the most striking difference between bacterial and eukaryotic Hsp90s, it may be involved in a gain of function of eukaryotic Hsp90s. Here, we have analyzed a fragment of yeast Hsp90 consisting of the N-terminal domain and the charged region (N272) in comparison with the isolated N-terminal domain (N210). We show that the charged region causes an increase in the affinity of the N-terminal domain for nonnative protein and establishes a crosstalk between peptide and ATP binding. Thus, the binding of peptide to N272 decreases its affinity for ATP and geldanamycin, whereas the ATP-binding properties of the monomeric N-terminal domain N210 are not influenced by peptide binding. We propose that the charged region connecting the two chaperone domains plays an important role in regulating chaperone function of Hsp90.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: heat shock Proteins; antitumor drugs; Peptide binding; Steroid receptors; Titration calorimetry
Institutionen der Universität: Fakultäten
Fakultäten > Fakultät für Ingenieurwissenschaften
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Biomaterialien
Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Biomaterialien > Lehrstuhl Biomaterialien - Univ.-Prof. Dr. Thomas Scheibel
Profilfelder > Advanced Fields > Neue Materialien
Profilfelder > Advanced Fields > Molekulare Biowissenschaften
Profilfelder > Advanced Fields > Polymer- und Kolloidforschung
Profilfelder > Emerging Fields > Lebensmittel- und Gesundheitswissenschaften
Profilfelder
Profilfelder > Advanced Fields
Profilfelder > Emerging Fields
Titel an der UBT entstanden: Nein
Themengebiete aus DDC: 600 Technik, Medizin, angewandte Wissenschaften
600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften
Eingestellt am: 01 Okt 2015 11:56
Letzte Änderung: 26 Nov 2015 10:51
URI: https://eref.uni-bayreuth.de/id/eprint/20051