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Functionally acceptable substitutions in two alpha-helical regions of lambda repressor.

J F Reidhaar-Olson1, R T Sauer

  • 1Department of Biology, Massachusetts Institute of Technology, Cambridge 02139.

Proteins
|January 1, 1990
PubMed
Summary
This summary is machine-generated.

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Investigating lambda repressor protein sequences revealed that amino acid substitutions are highly tolerated at surface positions but restricted at buried sites, highlighting degeneracy in protein fold information.

Area of Science:

  • Protein engineering and structural biology
  • Molecular genetics and bioinformatics
  • Biochemistry and biophysics

Background:

  • The N-terminal domain of lambda repressor contains critical alpha-helical regions that dictate protein function.
  • Understanding the sequence-structure-function relationship is crucial for protein design and engineering.

Purpose of the Study:

  • To investigate the informational content and tolerance to amino acid substitutions at specific residue positions within the lambda repressor N-terminal domain.
  • To determine how structural context (buried vs. surface) influences amino acid variability.

Main Methods:

  • Targeted random mutagenesis was employed to generate sequence variations.
  • Analysis of functionally allowed sequences to assess residue tolerance at 25 key positions in two alpha-helical regions.

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Main Results:

  • Significant variability in amino acid substitution tolerance was observed across different positions.
  • Buried positions exhibited severe limitations on residue type and number, while most surface positions showed high tolerance.
  • Specific surface positions demonstrated a preference for hydrophilic amino acids, with one position absolutely conserving proline.

Conclusions:

  • The study reveals a high degree of degeneracy in the sequence information specifying a protein fold.
  • Structural constraints significantly impact the permissible amino acid repertoire, with surface residues offering more flexibility but also specific preferences.