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Mol. Cell. Biol., 02 1997, 594-603, Vol 17, No. 2
SC Nair, RA Rimerman, EJ Toran, S Chen, V Prapapanich, RN Butts and DF Smith
A cDNA for human FKBP51 has been cloned and sequenced, and protein products
have been expressed in both in vitro and bacterial systems. The deduced
amino acid sequence for human FKBP51 is 90% identical to sequences of
recently described murine proteins and is 55% identical to the sequence of
human FKBP52. Human FKBP51 mRNA is expressed in a wide range of tissues,
and the protein has peptidylprolyl isomerase activity that is inhibited by
FK506 but not cyclosporine. FKBP51 is the same as a previously described
progesterone receptor-associated immunophilin that, similar to FKBP52 and
cyclophilin 40, is an Hsp90-binding protein and appears in functionally
mature steroid receptor complexes along with Hsp90 and p23. Each of the
three receptor-associated immunophilins displays interactions with
progesterone receptor that are more dynamic than Hsp90-receptor
interactions. Whereas FKBP52 and FKBP51 compete about equally well for
binding to Hsp90 in a purified system, FKBP51 accumulates preferentially in
progesterone receptor complexes assembled in a cell-free system. This
observation provides a precedent for differential interactions between
Hsp90-associated immunophilins and target proteins such as steroid
receptors.
Copyright © 1997, American Society for Microbiology
Molecular cloning of human FKBP51 and comparisons of immunophilin interactions with Hsp90 and progesterone receptor
Department of Pharmacology, University of Nebraska Medical Center, Omaha 68198-6260, USA.
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