The Solution Structure of the N-Terminal Domain of E3L Shows a Tyrosine Conformation That May Explain Its Reduced Affinity to Z-DNA in vitro
The N-terminal domain of the vaccinia virus protein E3L ( ZαE3 L) is essential for full viral pathogenicity in mice. It has sequence similarity to the high-affinity human Z-DNA-binding domains ZαADAR1and ZαDLM1. Here, we report the solution structure of ZαE3 Land the chemical shift map of its intera...
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Published in | Proceedings of the National Academy of Sciences - PNAS Vol. 101; no. 9; pp. 2712 - 2717 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
National Academy of Sciences
02.03.2004
National Acad Sciences |
Subjects | |
Online Access | Get full text |
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Summary: | The N-terminal domain of the vaccinia virus protein E3L ( ZαE3 L) is essential for full viral pathogenicity in mice. It has sequence similarity to the high-affinity human Z-DNA-binding domains ZαADAR1and ZαDLM1. Here, we report the solution structure of ZαE3 Land the chemical shift map of its interaction surface with Z-DNA. The global structure and the Z-DNA interaction surface of ZαE3 Lare very similar to the high-affinity Z-DNA-binding domains ZαADAR1and ZαDLM1. However, the key Z-DNA contacting residue Y48 of ZαE3 Ladopts a different side chain conformation in unbound ZαE3 L, which requires rearrangement for binding to Z-DNA. This difference suggests a molecular basis for the significantly lower in vitro affinity of ZαE3 Lto Z-DNA compared with its homologues. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2 To whom correspondence may be addressed. Fax: 617-253-8699 (A.R.). E-mail: schade@combinature.com (M.S.). Data deposition: The atomic coordinates of the 20 lowest energy structures of a total of 450 have been deposited in the Protein Data Bank, www.pdb.org (PDB ID code 1OYI). Contributed by Alexander Rich, December 23, 2003 Abbreviations: Zα, Z-DNA-binding protein domain; HSQC, heteronuclear single quantum coherence; NOE, nuclear Overhauser enhancement. |
ISSN: | 0027-8424 1091-6490 |
DOI: | 10.1073/pnas.0308612100 |