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DNA recognition by GAL4: structure of a protein-DNA complex.

A specific DNA complex of the 65-residue, N-terminal fragment of the yeast transcriptional activator, GAL4, has been analysed at 2.7 A resolution by X-ray crystallography. The protein binds as a dimer to a symmetrical 17-base-pair sequence. A small, Zn(2+)-containing domain recognizes a conserved CCG triplet at each end of the site through direct contacts with the major groove. A short coiled-coil dimerization element imposes 2-fold symmetry. A segment of extended polypeptide chain links the metal-binding module to the dimerization element and specifies the length of the site. The relatively open structure of the complex would allow another protein to bind coordinately with GAL4.

Pubmed ID: 1557122

Authors

  • Marmorstein R
  • Carey M
  • Ptashne M
  • Harrison SC

Journal

Nature

Publication Data

April 2, 1992

Associated Grants

None

Mesh Terms

  • Amino Acid Sequence
  • Base Sequence
  • Binding Sites
  • Computer Graphics
  • DNA
  • DNA-Binding Proteins
  • Fungal Proteins
  • Models, Molecular
  • Molecular Sequence Data
  • Oligodeoxyribonucleotides
  • Saccharomyces cerevisiae Proteins
  • Transcription Factors