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(Received for publication, July 16, 1997, and in revised form, August 27, 1997)
From the Department of Medicine and Children's Service, Endocrine
Unit, Massachusetts General Hospital and Harvard Medical School,
Boston, Massachusetts 02114
The parathyroid hormone (PTH)-2 receptor
displays strong ligand selectivity in that it responds fully to PTH but
not at all to PTH-related peptide (PTHrP). In contrast, the PTH-1
receptor (PTH/PTHrP receptor) responds fully to both ligands.
Previously it was shown that two divergent residues in PTH and PTHrP
account for PTH-2 receptor selectivity; position 23 (Trp in PTH and Phe in PTHrP) determines binding selectivity and position 5 (Ile in PTH and
His in PTHrP) determines signaling selectivity. To identify sites in
the PTH-2 receptor involved in discriminating between His5 and Ile5, we constructed PTH-2
receptor/PTH-1 receptor chimeras, expressed them in COS-7 cells, and
tested for cAMP responsiveness to
[Trp23] PTHrP-(1-36), and to the nondiscriminating
peptide [Ile5,Trp23]PTHrP-(1-36) (the
Phe23
Volume 272, Number 46,
Issue of November 14, 1997
pp. 28861-28868
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.
Residues in the Membrane-spanning and Extracellular Loop Regions
of the Parathyroid Hormone (PTH)-2 Receptor Determine Signaling
Selectivity for PTH and PTH-related Peptide
Trp modification enabled high affinity binding of
each ligand to the PTH-2 receptor). The chimeras revealed that the
membrane-spanning/loop region of the receptor determined
His5/Ile5 signaling selectivity. Subsequent
analysis of smaller cassette substitutions and then individual point
mutations led to the identification of two single residues that
function as major determinants of residue 5 signaling selectivity.
These residues, Ile244 at the extracellular end of
transmembrane helix 3, and Tyr318 at the COOH-terminal
portion of extracellular loop 2, are replaced by Leu and Ile in the
PTH-1 receptor, respectively. The results thus indicate a functional
interaction between two residues in the core region of the PTH-2
receptor and residue 5 of the ligand.
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