The designed protein M(II)-Gly-Lys-His-Fos(138-211) specifically cleaves the AP-1 binding site containing DNA

Biochemistry
C HarfordB Sarkar

Abstract

A new specific DNA cleavage protein, Gly-Lys-His-Fos(138-211), was designed, expressed, and characterized. The DNA-binding component of the design uses the basic and leucine zipper regions of the leucine zipper Fos, which are represented by Fos(138-211). The DNA cleavage moiety was provided by the design of the amino-terminal Cu(II)-, Ni(II)-binding site GKH at the amino terminus of Fos(138-211). Binding of Cu(II) or Ni(II) by the protein activates its cleavage ability. The GKH motif was predicted to form a specific amino-terminal Cu(II)-, Ni(II)-binding motif as previously defined [Predki, P. F., Harford, C., Brar, P., & Sarkar, B. (1992) Biochem. J. 287, 211 -215]. This prediction was verified as the tripeptide, GKH, and the expressed protein, GKH-Fos(138-211), were both shown to be capable of binding Cu(II) and Ni(II). The designed protein upon heterodimerization with Jun(248-334) was shown to bind to and cleave several forms of DNA which contained an AP-1 binding site. The cleavage was shown to be specific. This design demonstrates the versatility of the amino-terminal Cu(II)-, Ni(II)-binding motif and the variety of motifs which can be generated. The site of cleavage by GKH-Fos(138-211) on DNA provides further information ...Continue Reading

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