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Mol. Cell. Biol., Dec 1997, 7126-7131, Vol 17, No. 12
W Seol, M Chung and DD Moore
SHP (short heterodimer partner) is a novel orphan receptor that lacks a
conventional DNA binding domain and interacts with other members of the
nuclear hormone receptor superfamily. We have characterized the SHP
sequences required for interaction with other superfamily members, and have
defined an SHP repressor domain. In the mammalian two-hybrid system, a
fusion of full-length SHP to the GAL4 DNA binding domain shows
9-cis-retinoic acid-dependent interaction with a VP16-retinoid X receptor
alpha (RXR alpha) fusion. By deletion analysis, sequences required for this
RXR interaction map to the central portion of SHP (amino acids 92 to 148).
The same region is required for interaction with RXR in vitro and in the
yeast two-hybrid system, and results from the yeast system suggest that the
same SHP sequences are required for interaction with other members of the
nuclear hormone receptor superfamily such as thyroid hormone receptor and
retinoic acid receptor. In mammalian cells, a GAL4-SHP fusion protein shows
about 10- fold-decreased transcriptional activation relative to GAL4 alone,
and fusion of SHP to the C terminus of a GAL4-VP16 fusion to generate a
triple chimera also results in a strong decrease in transactivation
activity. Sequences required for this repressor function were mapped to the
C terminus of SHP. This region is distinct from that required for
corepressor interaction by other members of the nuclear hormone receptor
superfamily, and SHP did not interact with N-CoR in either the yeast or
mammalian two-hybrid system. Together, these results identify novel
receptor interaction and repressor domains in SHP and suggest two distinct
mechanisms for inhibition of receptor signaling pathways by SHP.
Copyright © 1997, American Society for Microbiology
Novel receptor interaction and repression domains in the orphan receptor SHP
Department of Molecular Biology, Massachusetts General Hospital, Boston 02114, USA.
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