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Originally published In Press as doi:10.1074/jbc.M210476200 on February 28, 2003
J. Biol. Chem., Vol. 278, Issue 18, 15595-15600, May 2, 2003
A Soluble Form of the First Extracellular Domain of
Mouse Type 2 Corticotropin-releasing Factor Receptor Reveals
Differential Ligand Specificity*
Marilyn H.
Perrin ,
Michael R.
DiGruccio,
Steven C.
Koerber,
Jean E.
Rivier§,
Koichi
S.
Kunitake,
Deborah L.
Bain,
Wolfgang H.
Fischer, and
Wylie W.
Vale¶
From The Clayton Foundation Laboratories for Peptide Biology, The
Salk Institute, La Jolla, California 92037
The heptahelical receptors for
corticotropin-releasing factor (CRF), CRFR1 and CRFR2, display
different specificities for CRF family ligands: CRF and urocortin I
bind to CRFR1 with high affinity, whereas urocortin II and III bind to
this receptor with very low affinities. In contrast, all the urocortins
bind with high affinities, and CRF binds with lower affinity to CRFR2.
The first extracellular domain (ECD1) of CRFR1 is important for
ligand recognition. Here, we characterize a bacterially
expressed soluble protein, ECD1-CRFR2 , corresponding to the ECD1
of mouse CRFR2 . The Ki values for binding to
ECD1-CRFR2 are: astressin = 10.7 (5.4-21.1) nM,
urocortin I = 6.4 (4.7-8.7) nM, urocortin II = 6.9 (5.8-8.3) nM, CRF = 97 (22-430) nM,
urocortin III = sauvagine >200 nM. These affinities
are similar to those for binding to a chimeric receptor in which the
ECD1 of CRFR2 replaces the ECD of the type 1B activin receptor
(ALK4). The ECD1-CRFR2 possesses a disulfide arrangement identical
to that of the ECD1 of CRFR1, namely
Cys45-Cys70,
Cys60-Cys103, and
Cys84-Cys118. As determined by circular
dichroism, ECD1-CRFR2 undergoes conformational changes upon binding
astressin. These data reinforce the importance of the ECD1 of CRF
receptors for ligand recognition and raise the interesting possibility
that different ligands having similar affinity for the full-length
receptor may, nevertheless, have different affinities for
microdomains of the receptor.
*
This work was supported in part by National Institutes of
Health Grant NIDDK 26741, the Foundation for Research.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.
To whom correspondence should be addressed: The Clayton Foundation
Laboratories for Peptide Biology, The Salk Institute, 10010 North
Torrey Pines Rd., La Jolla, CA 92037; Tel.: 858-453-4100; Fax:
858-558-8763; E-mail: perrin@salk.edu.
§
The Dr. Frederik Paulsen Chair in Neurosciences Professor.
¶
A Senior Foundation for Research Investigator.
Copyright © 2003 by The American Society for Biochemistry and Molecular Biology, Inc.

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Copyright © 2003 by the American Society for Biochemistry and Molecular Biology.
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