Mutations and structural domains of hsp90. (A) The
location of two highly charged regions (A, 206–287 and B, 548–563), a
potential leucine zipper region (Z, 378–429), and the conserved MEEVD
at the C terminus of hsp90. Regions that bind ATP/geldanamycin (GA)
(12–14) or co-chaperones (8–11) plus two domains that have been
proposed for substrate binding (29, 30) are also indicated.
(B) The hsp90 constructs used in this study are
illustrated plus a summary of their activities for binding p23, Hop,
and, ATP or for chaperoning PR as active (+), not active (−) or not
tested (NT).