Proteolytic Dissection of Zab, the Z-DNA-binding Domain of Human ADAR1*

Zα is a peptide motif that binds to Z-DNA with high affinity. This motif binds to alternating dC-dG sequences stabilized in the Z-conformation by means of bromination or supercoiling, but not to B-DNA. Zα is part of the N-terminal region of double-stranded RNA adenosine deaminase (ADAR1) , a candidate enzyme for nuclear pre-mRNA editing in mammals. Zα is conserved in ADAR1 from many species; in each case, there is a second similar motif,Zβ, separated from Zα by a more divergent linker. To investigate the structure-function relationship ofZα, its domain structure was studied by limited proteolysis. Proteolytic profiles indicated that Zα is part of a domain, Zab, of 229 amino acids (residues 133–361 in human ADAR1). This domain contains both Zα and Zβas well as a tandem repeat of a 49-amino acid linker module. Prolonged proteolysis revealed a minimal core domain of 77 amino acids (positions 133–209), containing only Zα, which is sufficient to bind left-handed Z-DNA; however, the substrate binding is strikingly different from that of Zab. The second motif, Zβ, retains its structural integrity only in the context of Zab and does not bind Z-DNA as a separate entity. These results suggest that Zαand Zβ act as a single bipartite domain. In the presence of substrate DNA, Zab becomes more resistant to proteases, suggesting that it adopts a more rigid structure when bound to its substrate, possibly with conformational changes in parts of the protein.

• Publication year

  1999

• Venue

  Journal of Biological Chemistry

• Publication date

  1999-01-29

• Fields of study

  Biology, Medicine, Chemistry

• Identifiers
  DOI 10.1074/jbc.274.5.2899PMID 9915827
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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