Localization and characterization of the dimerization domain of holliday structure resolving endonuclease VII of phage T4

Journal of Molecular Biology
R P Birkenbihl, B Kemper

Abstract

Endonuclease VII (Endo VII) is a Holliday structure resolving enzyme of bacteriophage T4. Its nucleolytic activity depends on subactivities, which in order of execution are: (i) dimerization, (ii) binding to DNA, (iii) and cleavage of DNA. In an effort to assign these subfunctions to the primary sequence of the protein, a series of spontaneous point mutations deficient in DNA cleavage was isolated. Some of these mutations affected the dimerization of Endo VII. Compared with wild-type protein, which dimerizes completely in solution, more than 95% of one of the mutant proteins (W87R) remained in the monomeric state. Only the dimeric fraction of this protein bound to DNA. The dimerization domain of Endo VII was mapped by truncating the gene from both ends and analysing the dimerization ability of the purified peptides by crosslinking with glutaraldehyde. The dimerization domain was thus determined to reside between amino acid residues 55 and 105. Computer analyses predicted two alpha-helices (H2 and H3) in this section of the protein. As demonstrated by heterodimer formation, two copies of helix H3, but only one copy of helix H2, are required for dimerization. Helical wheel analyses revealed that both helices expose a hydrophobic ...Continue Reading

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Citations

Jun 5, 2001·Nature Reviews. Molecular Cell Biology·D M Lilley, M F White
May 23, 2002·The Journal of Biological Chemistry·Ayna AlfadhliEric Barklis
Nov 21, 1998·The Journal of Biological Chemistry·C KupferB Kemper
Nov 7, 2002·Journal of Molecular Biology·Ulrich Rass, Börries Kemper

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