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Molecular and Cellular Biology, September 1998, p. 5371-5379, Vol. 18, No. 9
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Activation of Neu (ErbB-2) Mediated by Disulfide Bond-Induced
Dimerization Reveals a Receptor Tyrosine Kinase Dimer
Interface
Christine L.
Burke
and
David F.
Stern*
Department of Pathology, Yale University, New
Haven, Connecticut 06520-8023
Received 4 September 1997/Returned for modification 24 October
1997/Accepted 3 June 1998
Receptor dimerization is a crucial intermediate step in activation
of signaling by receptor tyrosine kinases (RTKs). However, dimerization
of the RTK Neu (also designated ErbB-2, HER-2, and p185neu), while necessary, is not sufficient
for signaling. Earlier work in our laboratory had shown that
introduction of an ectopic cysteine into the Neu juxtamembrane domain
induces Neu dimerization but not signaling. Since Neu signaling does
require dimerization, we hypothesized that there are additional
constraints that govern signaling ability. With the importance of the
interreceptor cross-phosphorylation reaction, a likely constraint was
the relative geometry of receptors within the dimer. We have tested
this possibility by constructing a consecutive series of cysteine
substitutions in the Neu juxtamembrane domain in order to force
dimerization along a series of interreceptor faces.
Within the group that dimerized constitutively, a subset had
transforming activity. The substitutions in this subset all mapped
to the same face of a predicted alpha helix, the most likely conformation for the intramembrane domain. Furthermore, this face of
interaction aligns with the projected Neu* V664E substitution and with
a predicted amphipathic interface in the Neu juxtamembrane domain. We
propose that these results identify an RTK dimer interface and that
dimerization of this RTK induces an extended contact between
juxtamembrane and intramembrane alpha helices.
*
Corresponding author. Mailing address: Dept. of
Pathology, Yale University, 310 Cedar St., Room BML 342, New Haven, CT
06520-8023. Phone: (203) 785-4832. Fax: (203) 785-7467. E-mail:
Stern{at}biomed.med.yale.edu.

Present address: Dept. of Lab Medicine, University of
California

San Francisco, San Francisco, CA 94143-0100.
Molecular and Cellular Biology, September 1998, p. 5371-5379, Vol. 18, No. 9
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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