Chemically modified tandem repeats in proteins: natural combinatorial peptide libraries

Area of Science:

• Molecular Biology
• Biochemistry
• Genetics

Background:

• Proteins with tandem repeats are frequently modified by post-translational modifications (PTMs).
• The number of tandem repeats in proteins can vary due to DNA sequence instability.
• These observations suggest a link between PTMs, repeat number variability, and protein function regulation.

Purpose of the Study:

• To review how protein modifications and tandem repeats contribute to functional diversity.
• To explore the hypothesis that cells combine PTMs and repeat number variability to mediate protein function.
• To speculate on novel peptide-based biomolecules using modified repetitive sequences.

Main Methods:

• Literature review of studies on protein tandem repeats and PTMs.
• Analysis of examples demonstrating co-regulation of cellular functions by these mechanisms.
• Synthesis of findings to propose a common regulatory mechanism.

Main Results:

• Protein modifications and variable tandem repeat numbers are widespread mechanisms for imparting functional diversity.
• Evidence suggests these processes are co-regulated across diverse cellular functions in all organisms.
• A common, though poorly understood, mechanism for protein regulation and diversification is indicated.

Conclusions:

• Post-translational modifications and tandem repeat variability are key strategies for protein functional diversification.
• These mechanisms represent a fundamental biological process conserved across species.
• Future research may leverage these principles for designing novel peptide-based biomolecules.