title: BS69/ZMYND11 C-Terminal Domains Bind and Inhibit EBNA2.
abstract: Epstein-Barr virus (EBV) nuclear antigen 2 (EBNA2) plays an important role in driving immortalization of EBV-infected B cells through regulating the expression of many viral and cellular genes. We report a structural study of the tumor suppressor BS69/ZMYND11 C-terminal region, comprised of tandem coiled-coil-MYND domains (BS69CC-MYND), in complex with an EBNA2 peptide containing a PXLXP motif. The coiled-coil domain of BS69 self-associates to bring two separate MYND domains in close proximity, thereby enhancing the BS69 MYND-EBNA2 interaction. ITC analysis of BS69CC-MYND with a C-terminal fragment of EBNA2 further suggests that the BS69CC-MYND homodimer synergistically binds to the two EBNA2 PXLXP motifs that are respectively located in the conserved regions CR7 and CR8. Furthermore, we showed that EBNA2 interacts with BS69 and down-regulates its expression at both mRNA and protein levels in EBV-infected B cells. Ectopic BS69CC-MYND is recruited to viral target promoters through interactions with EBNA2, inhibits EBNA2-mediated transcription activation, and impairs proliferation of lymphoblastoid cell lines (LCLs). Substitution of critical residues in the MYND domain impairs the BS69-EBNA2 interaction and abolishes the BS69 inhibition of the EBNA2-mediated transactivation and LCL proliferation. This study identifies the BS69 C-terminal domains as an inhibitor of EBNA2, which may have important implications in development of novel therapeutic strategies against EBV infection.
authors: Department of Biochemistry, University of California, Riverside, Riverside, California, United States of America.
authors: Matthew R
authors: MR
authors: Harter
authors: Institute of Medical Sciences, Tzu Chi University, Hualien, Taiwan.
authors: Cheng-Der
authors: CD
authors: Liu
authors: Institute of Medical Sciences, Tzu Chi University, Hualien, Taiwan.
authors: Chih-Lung
authors: CL
authors: Shen
authors: Department of Biochemistry, University of California, Riverside, Riverside, California, United States of America.|MARC U-STAR Program, University of California, Riverside, Riverside, California, United States of America.
authors: Elsie
authors: E
authors: Gonzalez-Hurtado
authors: Department of Biochemistry, University of California, Riverside, Riverside, California, United States of America.
authors: Zhi-Min
authors: ZM
authors: Zhang
authors: Department of Biochemistry, University of California, Riverside, Riverside, California, United States of America.
authors: Muyu
authors: M
authors: Xu
authors: Department of Biochemistry, University of California, Riverside, Riverside, California, United States of America.|MARC U-STAR Program, University of California, Riverside, Riverside, California, United States of America.
authors: Ernest
authors: E
authors: Martinez
authors: Institute of Medical Sciences, Tzu Chi University, Hualien, Taiwan.
authors: Chih-Wen
authors: CW
authors: Peng
authors: Department of Biochemistry, University of California, Riverside, Riverside, California, United States of America.
authors: Jikui
authors: J
authors: Song
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001402:B-Lymphocytes / Q000821:virology; D002352:Carrier Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D018797:Cell Cycle Proteins; D002460:Cell Line; D056970:Co-Repressor Proteins; D003461:Crystallography; D004268:DNA-Binding Proteins; D020031:Epstein-Barr Virus Infections / Q000821:virology*; D019309:Epstein-Barr Virus Nuclear Antigens / Q000235:genetics / Q000378:metabolism; D004854:Herpesvirus 4, Human / Q000502:physiology*; D006801:Humans; D051379:Mice; D008969:Molecular Sequence Data; D011401:Promoter Regions, Genetic / Q000235:genetics; D011485:Protein Binding; D025941:Protein Interaction Mapping; D017434:Protein Structure, Tertiary; D016415:Sequence Alignment; D020080:Tandem Repeat Sequences; D015533:Transcriptional Activation; D014764:Viral Proteins / Q000037:antagonists & inhibitors* / Q000235:genetics / Q000378:metabolism
chemical_list: D002352:Carrier Proteins; D018797:Cell Cycle Proteins; D056970:Co-Repressor Proteins; D004268:DNA-Binding Proteins; C402641:EBNA-2 protein, Human herpesvirus 4; D019309:Epstein-Barr Virus Nuclear Antigens; D014764:Viral Proteins; C490622:Zmynd11 protein, mouse