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Related Experiment Videos

Charge changes in protein evolution.

E W Peetz1, G Thomson, P W Hedrick

  • 1Department of Genetics, University of California, Berkeley 94720.

Molecular Biology and Evolution
|January 1, 1986
PubMed
Summary
This summary is machine-generated.

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Protein evolution shows charge changes accumulate slower than random models predict for hemoglobin, myoglobin, and insulin. Cytochrome c and fibrinopeptides evolve at rates similar to random substitution.

Area of Science:

  • Molecular Evolution
  • Biochemistry
  • Genetics

Background:

  • Protein sequences evolve over time through genetic mutations.
  • Amino acid substitutions can alter protein properties, including charge.
  • Understanding evolutionary rates helps predict protein function and adaptation.

Purpose of the Study:

  • To investigate the rate of charge changes in protein evolution.
  • To compare observed charge change rates with predictions from random substitution models.
  • To identify proteins that deviate from neutral evolutionary processes.

Main Methods:

  • Analysis of seven protein sequences: cytochrome c, hemoglobin alpha, hemoglobin beta, myoglobin, insulin, and fibrinopeptides A and B.
  • Quantification of charge changes relative to total amino acid replacements.

Related Experiment Videos

  • Comparison with expected values under a random nucleotide substitution model.

    • Main Results:

    • Hemoglobin alpha, hemoglobin beta, myoglobin, and insulin accumulate charge changes at rates slower than predicted by random substitution.
    • Cytochrome c and fibrinopeptides A and B show charge change accumulation rates similar to random substitution predictions.
    • Deviations suggest selective pressures influencing charge evolution in certain proteins.

    Conclusions:

    • Certain proteins, like hemoglobin and insulin, exhibit non-random evolutionary patterns in charge accumulation.
    • The study highlights varying evolutionary constraints across different protein families.
    • Findings contribute to understanding the molecular basis of protein adaptation and evolution.