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Of palindromes and peptides.

S Ohno1

  • 1Beckman Research Institute of the City of Hope, Duarte, CA 91010-0269.

Human Genetics
|December 1, 1992
PubMed
Summary

Proteins frequently contain peptidic palindromes, with DNA-binding proteins showing higher percentages. Analysis reveals palindromes up to 14 residues, suggesting longer ones exist in unstudied proteins.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Bioinformatics

Background:

  • Peptidic palindromes are sequence repeats within proteins.
  • Their prevalence and functional significance are not fully understood.

Purpose of the Study:

  • To quantify the occurrence of peptidic palindromes in proteins.
  • To investigate potential correlations between palindrome frequency and protein function.

Main Methods:

  • Bioinformatic analysis of protein sequence databases.
  • Identification and characterization of palindromic sequences.

Main Results:

  • On average, 30% of protein residues belong to peptidic palindromes (tripeptide length or longer).
  • DNA-binding proteins, such as histones, exhibit higher palindrome content, reaching up to 50%.
  • The longest identified palindrome was 14 residues long.

Conclusions:

  • Peptidic palindromes are a common structural motif in proteins.
  • Their increased frequency in DNA-binding proteins suggests a role in protein-DNA interactions.
  • Further research is warranted to explore longer palindromes and their functional implications.

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