Amino acid code of protein secondary structure

Area of Science:

• Biochemistry and Structural Biology
• Computational Biology and Bioinformatics

Background:

• Predicting protein three-dimensional structure from amino acid sequences remains a fundamental challenge.
• Protein secondary structure is stabilized by short- and middle-range interactions.

Purpose of the Study:

• To present the principles of a code theory for protein secondary structure.
• To introduce the amino acid code of protein secondary structure.
• To propose a method for calculating secondary structure from amino acid sequences.

Main Methods:

• Definition of secondary structure segments (alpha-helices, beta-strands, coils) based on residue interactions.
• Encoding of secondary structure elements using specific amino acid residue pairs (codons).
• Classification of codons into 21 types based on strength and hierarchical selection to avoid structural overlaps.

Main Results:

• Development of a theory for protein secondary structure based on residue pair codons.
• Generation of six variants of the amino acid code for protein secondary structure.
• Identification of codons as elementary structural elements (structurons).

Conclusions:

• The code theory provides a partial solution for calculating protein secondary structure from amino acid sequences.
• The theory can inform simulations of protein folding and tertiary structure formation.
• Codons can be viewed as foundational elements in the language of protein three-dimensional structure.