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J. Biol. Chem., Vol. 276, Issue 22, 19640-19647, June 1, 2001
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From the We recently reported the identification of a RING
finger-containing protein, HHARI (human
homologue of Drosophila ariadne), which binds to the human ubiquitin-conjugating enzyme UbcH7 in vitro. We now demonstrate that HHARI interacts and co-localizes with UbcH7 in mammalian cells, particularly in the perinuclear region.
We have further defined a minimal interaction region of HHARI
comprising residues 186-254, identified individual amino acid residues
essential for the interaction, and determined that the distance between
the RING1 finger and IBR (in between
RING fingers) domains is critical to maintaining binding.
We have also established that the RING1 finger of HHARI cannot be
substituted for by the highly homologous RING finger domains of either
of the ubiquitin-protein ligase components c-CBL or Parkin, despite their similarity in structure and their independent capabilities to
bind UbcH7. Furthermore, mutation of the RING1 finger domain of HHARI
from a RING-HC to a RING-H2 type abolishes interaction with UbcH7.
These studies demonstrate that very subtle changes to the domains that
regulate recognition between highly conserved components of the
ubiquitin pathway can dramatically affect their ability to interact.
Features of the Parkin/Ariadne-like Ubiquitin Ligase, HHARI,
That Regulate Its Interaction with the Ubiquitin-conjugating Enzyme,
UbcH7*
§,
,
,
, and
¶
Molecular Medicine Unit and the ¶ Leeds
Dental Institute, University of Leeds, Clinical Sciences Building,
St. James's University Hospital, Leeds LS9 7TF, United Kingdom
*
This work was supported by the Wellcome Trust, the Royal
Society, Yorkshire Cancer Research, and a Lloyds of London Tercentenary Foundation Fellowship (to H. C. A.).The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
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