1BSX

STRUCTURE AND SPECIFICITY OF NUCLEAR RECEPTOR-COACTIVATOR INTERACTIONS

Summary for 1BSX

• Entry DOI: 10.2210/pdb1bsx/pdb
• Descriptor: PROTEIN (THYROID HORMONE RECEPTOR BETA), PROTEIN (GRIP1), 3,5,3'TRIIODOTHYRONINE (3 entities in total)
• Functional Keywords: nuclear receptors, coactivators, grip1, specificity interaction site, hormone-growth factor complex, hormone/growth factor
• Biological source: Homo sapiens (human)
• Cellular location: Nucleus: P10828
• Total number of polymer chains: 4
• Total formula weight: 63139.41

Authors

Wagner, R.L.,Darimont, B.D.,Apriletti, J.W.,Stallcup, M.R.,Kushner, P.J.,Baxter, J.D.,Fletterick, R.J.,Yamamoto, K.R. (deposition date: 1998-08-31, release date: 1999-08-26, Last modification date: 2024-04-03)

Primary citation

Darimont, B.D.,Wagner, R.L.,Apriletti, J.W.,Stallcup, M.R.,Kushner, P.J.,Baxter, J.D.,Fletterick, R.J.,Yamamoto, K.R.
Structure and specificity of nuclear receptor-coactivator interactions.
Genes Dev., 12:3343-3356, 1998

PubMed Abstract: Combinatorial regulation of transcription implies flexible yet precise assembly of multiprotein regulatory complexes in response to signals. Biochemical and crystallographic analyses revealed that hormone binding leads to the formation of a hydrophobic groove within the ligand binding domain (LBD) of the thyroid hormone receptor that interacts with an LxxLL motif-containing alpha-helix from GRIP1, a coactivator. Residues immediately adjacent to the motif modulate the affinity of the interaction; the motif and the adjacent sequences are employed to different extents in binding to different receptors. Such interactions of amphipathic alpha-helices with hydrophobic grooves define protein interfaces in other regulatory complexes as well. We suggest that these common structural elements impart flexibility to combinatorial regulation, whereas side chains at the interface impart specificity.

PubMed: 9808622

Experimental method

X-RAY DIFFRACTION (3.7 Å)