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Related Experiment Videos

The complex between phage 434 repressor DNA-binding domain and operator site OR3: structural differences between

D W Rodgers1, S C Harrison

  • 1Howard Hughes Medical Institute, Harvard University, Cambridge, MA 02138.

Structure (London, England : 1993)
|December 15, 1993
PubMed
Summary

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The phage 434 repressor’s DNA binding structure reveals how a single base pair change in operator sites dictates regulatory switches. This structural insight explains differential specificity in gene regulation.

Area of Science:

  • Molecular Biology
  • Structural Biology
  • Genetics

Background:

  • The phage 434 repressor functions as a homodimer, binding operator sites to control lysogenic or lytic growth.
  • Phage 434 operator sites are 14 base pairs with conserved 5'-ACAA sequences, except for OR3, which has a non-consensus G.C base pair.

Purpose of the Study:

  • To analyze differential specificity in repressor-DNA interactions.
  • To understand the structural basis for the regulatory switch influenced by operator site variations.

Main Methods:

  • Determined the 2.5 Å resolution structure of the R1-69 repressor DNA-binding domain complexed with the OR3 operator site.
  • Compared this structure with previously solved complexes of R1-69 bound to OR1 and OR2.

Main Results:

Related Experiment Videos

  • Observed significant structural differences between consensus and non-consensus half-sites of OR3.
  • Identified a DNA backbone shift and monomer rotation in R1-69 upon binding the non-consensus OR3 site.

Conclusions:

  • Recognition of the critical G.C base pair involves multiple amino acid residues, not just directly interacting ones.
  • The repressor induces an altered DNA conformation in the non-consensus half-site, impacting regulatory control.