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J. Biol. Chem., Vol. 277, Issue 20, 17381-17384, May 17, 2002
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,
, and
From the Joslin Diabetes Center & Department of Medicine,
Harvard Medical School, Boston, Massachusetts 02215
The nuclear lamins form a two-dimensional
matrix that provides integrity to the cell nucleus and participates in
nuclear activities. Mutations in the region of human LMNA
encoding the carboxyl-terminal tail Lamin A/C are associated with
forms of muscular dystrophy and familial partial lipodystrophy
(FPLD). To help discriminate tissue-specific phenotypes, we
have solved at 1.4-Å resolution the three-dimensional crystal
structure of the lamin A/C globular tail. The domain adopts a novel,
all
immunoglobulin-like fold. FPLD-associated mutations cluster
within a small surface, whereas muscular dystrophy-associated mutations
are distributed throughout the protein core and on its surface. These
findings distinguish myopathy- and lipodystrophy-associated mutations
and provide a structural framework for further testing hypotheses
concerning lamin function.
The atomic coordinates and the structure factors (code 1IFR) have been deposited in the Protein Data Bank, Research Collaboratory for Structural Bioinformatics, Rutgers University, New Brunswick, NJ (http://www.rcsb.org/).
Both authors supported by Mary K. Iacocca Fellowships.
§
Supported by National Institutes of Health Fellowship DK09393.
¶
To whom correspondence should be addressed: Joslin
Diabetes Center, One Joslin Place, Boston, MA 02215. E-mail:
Steven. Shoelson@joslin.harvard.edu.
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