2N3K

Human Brd4 ET domain in complex with MLV Integrase C-term

Summary for 2N3K

• Entry DOI: 10.2210/pdb2n3k/pdb
• NMR Information: BMRB: 25649
• Descriptor: Bromodomain-containing protein 4, MLV integrase (2 entities in total)
• Functional Keywords: brd4 et, mlv integrase, protein binding
• Biological source: Homo sapiens (human); More
• Cellular location: Nucleus: O60885
• Total number of polymer chains: 2
• Total formula weight: 12150.96

Authors

Crowe, B.L.,Foster, M.P. (deposition date: 2015-06-03, release date: 2016-03-02, Last modification date: 2024-05-15)

Primary citation

Crowe, B.L.,Larue, R.C.,Yuan, C.,Hess, S.,Kvaratskhelia, M.,Foster, M.P.
Structure of the Brd4 ET domain bound to a C-terminal motif from gamma-retroviral integrases reveals a conserved mechanism of interaction.
Proc.Natl.Acad.Sci.USA, 113:2086-2091, 2016

PubMed Abstract: The bromodomain and extraterminal domain (BET) protein family are promising therapeutic targets for a range of diseases linked to transcriptional activation, cancer, viral latency, and viral integration. Tandem bromodomains selectively tether BET proteins to chromatin by engaging cognate acetylated histone marks, and the extraterminal (ET) domain is the focal point for recruiting a range of cellular and viral proteins. BET proteins guide γ-retroviral integration to transcription start sites and enhancers through bimodal interaction with chromatin and the γ-retroviral integrase (IN). We report the NMR-derived solution structure of the Brd4 ET domain bound to a conserved peptide sequence from the C terminus of murine leukemia virus (MLV) IN. The complex reveals a protein-protein interaction governed by the binding-coupled folding of disordered regions in both interacting partners to form a well-structured intermolecular three-stranded β sheet. In addition, we show that a peptide comprising the ET binding motif (EBM) of MLV IN can disrupt the cognate interaction of Brd4 with NSD3, and that substitutions of Brd4 ET residues essential for binding MLV IN also impair interaction of Brd4 with a number of cellular partners involved in transcriptional regulation and chromatin remodeling. This suggests that γ-retroviruses have evolved the EBM to mimic a cognate interaction motif to achieve effective integration in host chromatin. Collectively, our findings identify key structural features of the ET domain of Brd4 that allow for interactions with both cellular and viral proteins.

PubMed: 26858406
DOI: 10.1073/pnas.1516813113

Experimental method

SOLUTION NMR