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J. Biol. Chem., Vol. 262, Issue 36, 17443-17449, Dec, 1987
IR van Driel, JL Goldstein, TC Sudhof and MS Brown
The ligand binding domain of the low density lipoprotein receptor consists
of seven cysteine-rich repeats of approximately 40 amino acids each. These
repeats, which are located at the NH2 terminus of the protein, are
homologous to sequences in complement components C8 and C9. To determine
the role of the first repeat (amino acids 2-42), we prepared two plasmids
containing expressible low density lipoprotein receptor cDNAs. The first
plasmid, p delta R1, lacks only the nucleotides encoding the first repeat.
It produced a receptor that bound and internalized lipoproteins and
recycled to the cell surface with the same efficiency as the normal
receptor. This deleted receptor failed to bind two monoclonal antibodies,
IgG-C7 and IgG-15C8, which were shown previously to react with the
ligand-binding domain. The second plasmid, pR1, encodes a markedly
truncated protein whose extracellular domain consists of the first repeat
joined to the transmembrane and cytoplasmic domains. This protein bound the
two monoclonal antibodies with the same affinity as the normal receptor,
but failed to bind lipoproteins. Binding of IgG-15C8 to the normal receptor
and the pR1-encoded protein was Ca2+-dependent, indicating that the first
repeat binds Ca2+. We conclude that repeats 2-6 in the ligand-binding
domain are sufficient for binding lipoproteins and that the first repeat is
highly immunogenic, but is not required for lipoprotein binding.
First cysteine-rich repeat in ligand-binding domain of low density lipoprotein receptor binds Ca2+ and monoclonal antibodies, but not lipoproteins
Department of Molecular Genetics, University of Texas Health Science Center, Southwestern Medical School, Dallas 75235.
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