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J Biol Chem, Vol. 275, Issue 2, 1089-1094, January 14, 2000
From the Department of Biochemistry and Molecular Biology, College
of Medicine, University of Illinois at Chicago,
Chicago, Illinois 60612-4316
Human
The atomic coordinates and structure factors (code 1BV8) have
been deposited in the Protein Data Bank, Research Collaboratory for
Structural Bioinformatics, Rutgers University, New Brunswick, NJ
(http://www.rcsb.org/).
NMR Solution Structure of the Receptor Binding Domain of Human
2-Macroglobulin*
,
2-macroglobulin-proteinase complexes bind to their
receptor, the low density lipoprotein receptor-related protein (LRP), through a discrete 138-residue C-terminal receptor binding domain (RBD), which also binds to the
-amyloid peptide. We have used NMR
spectroscopy on recombinantly expressed uniformly
13C/15N-labeled human RBD to determine its
three-dimensional structure in solution. Human RBD is a sandwich of two
antiparallel
-sheets, one four-strand and one five-strand, and also
contains one
-helix of 2.5 turns and an additional 1-turn helical
region. The principal
-helix contains two lysine residues on the
outer face that are known to be essential for receptor binding. A
calcium binding site (Kd ~ 11 mM) is
present in the loop region at one end of the
-sandwich. Calcium
binding principally affects this loop region and does not significantly
perturb the stable core structure of the domain. The structure and NMR
assignments will enable us to examine in solution specific binding of
RBD to domains of the receptor and to
-amyloid peptide.
*
This work was supported by Grant GM54414 from the National
Institutes of Health (to P. G. W. G.).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.
Supported by a postdoctoral fellowship from the Danish Natural
Science Research Council.
§
Recipient of a Junior Faculty Award from the American Cancer Society.
¶
To whom correspondence should be addressed. Tel.:
312 996 5534; Fax: 312 413 0364; E-mail:
pgettins@tigger.uic.edu.
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