Homologous pairing of DNA molecules by Ustilago rec1 protein is promoted by sequences of Z-DNA. Academic Article uri icon

Overview

abstract

  • Plasmids containing Z-DNA stretches can be paired and linked by combined action of Ustilago rec1 protein and topoisomerase. The product formed is a hemicatenated dimer in which two DNA rings are topologically intertwined at a region of homology. Superhelicity governs the reaction. Formation of linked product is coupled with formation of Z-DNA in the plasmid, a process dependent on the superhelix density. Pairing appears to initiate within the Z-DNA sequence, not at the unwound B-Z junction. The reaction can be blocked by a Z-DNA-specific binding protein, namely Z-DNA antibody. Plasmids with alternating Z-DNA dG-dC sequences at different sites on otherwise homologous molecules can be linked at the dG-dC sequences. However, a plasmid with a (dG-dC)n.(dG-dC)n Z-DNA stretch cannot be linked with a plasmid containing a (dG-dT)n.(dC-dA)n Z-DNA stretch.

publication date

  • February 28, 1986

Research

keywords

  • DNA, Superhelical
  • Fungal Proteins
  • Recombination, Genetic

Identity

Scopus Document Identifier

  • 0023058297

Digital Object Identifier (DOI)

  • 10.1016/0092-8674(86)90264-3

PubMed ID

  • 3948243

Additional Document Info

volume

  • 44

issue

  • 4