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Related Experiment Videos

Structure and mobility of the PUT3 dimer

K J Walters1, K T Dayie, R J Reece

  • 1Committee on Higher Degrees in Biophysics, Harvard University, Cambridge, Massachusetts 02138, USA.

Nature Structural Biology
|September 26, 1997
PubMed
Summary
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The transcriptional activator PUT3 (31-100) protein

Area of Science:

  • Molecular biology
  • Structural biology
  • Biochemistry

Background:

  • PUT3 is a transcriptional activator involved in gene regulation.
  • PUT3 (31-100) comprises three domains: a cysteine zinc cluster, linker, and dimerization domain.

Purpose of the Study:

  • To characterize the solution structure and backbone dynamics of PUT3 (31-100).
  • To compare PUT3's structural features with related proteins like GAL4 and PPR1.
  • To develop a model for DNA binding specificity based on structural comparisons.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy was employed to determine the solution structure.
  • Backbone dynamics were analyzed using NMR data.
  • Structural comparisons were made with existing crystal structures of GAL4 and PPR1.

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Main Results:

  • The cysteine zinc cluster of PUT3 resembles GAL4's structure.
  • The dimerization domain forms a coiled-coil similar to GAL4 and PPR1, but with distinct N-terminal dynamics.
  • PUT3 exhibits diverse dynamics between its zinc cluster and dimerization domains.

Conclusions:

  • Structural similarities and differences provide insights into DNA binding specificity.
  • The distinct dynamics of PUT3's domains suggest functional specialization.
  • PUT3's zinc clusters show dynamics akin to small proteins, while the dimerization domain behaves like a large protein.