A 60 kD heat-shock protein-like molecule interacts with the HIV transmembrane glycoprotein gp41

Cornelia Speth, Zoltán Prohászka, Mechthild Mair, Gabriele Stöckl, Xiaojie Zhu, Barbara Jöbstl, George Füst, Manfred P. Dierich

Research output: Article

18 Citations (Scopus)

Abstract

The heat-shock protein hsp60 is typically found in mitochondria, but, in smaller amounts, also in the cell cytoplasm and associated with the cell membrane. Since heat-shock proteins are known to interact with a variety of molecules and since purified HIV-1 particles were described to contain hsp60 molecules, we tested the possibility that a previously described putative receptor for HIV transmembrane protein gp41 is identical to hsp60. The gp41- binding human protein P62 was purified from H9 and Raji cell lysates by a gp41-coupled affinity column. We could show crossreactivity of both polyclonal and monoclonal anti-hsp60 antibodies with the purified P62. in addition we analyzed binding of P18, a soluble gp41 fragment harboring the extracellular domain (Env aa539-684), to recombinant hsp60. Hsp60 bound well to P18-coated ELISA plates whereas HIV-1 surface protein gp120 induced no binding of hsp60. Preincubation of hsp60 with gp41 abolished the binding. The possible role of this molecule as a cofactor in the pathogenesis of HIV disease is discussed.

Original languageEnglish
Pages (from-to)619-628
Number of pages10
JournalMolecular Immunology
Volume36
Issue number9
DOIs
Publication statusPublished - jún. 1999

ASJC Scopus subject areas

  • Immunology
  • Molecular Biology

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