A building blocks perspective on protein emergence and evolution.

Area of Science:

• Biochemistry
• Evolutionary Biology
• Molecular Biology

Background:

• Recent findings suggest proteins emerge from assembling short peptide "building blocks."
• Understanding the origin and evolution of these building blocks is crucial for deciphering protein emergence.
• The evolutionary trajectory from primordial peptides to modern proteins remains an active area of research.

Purpose of the Study:

• To review complementary approaches for investigating the origin and evolution of protein building blocks.
• To explore how these building blocks may have emerged and assembled into contemporary proteins.
• To shed light on the ancient molecules and evolutionary mechanisms involved in protein formation.

Main Methods:

• A bottom-up approach identifying putative primordial peptide components and their synthetic routes.
• Searches in protein space to identify shared building blocks across the contemporary protein repertoire.
• Comparative analysis of proteins, even distantly related ones, to find common ancestral parts.

Main Results:

• Identification of potential primordial peptide components and their formation pathways.
• Discovery of shared building blocks in non-homologous proteins, indicating common ancestry.
• Characterization of functions of these shared building blocks provides insights into early protein evolution.

Conclusions:

• Two complementary approaches, bottom-up and protein space analysis, offer insights into protein evolution.
• Shared building blocks suggest a common molecular ancestry for diverse proteins.
• Merging these approaches is key to a cohesive narrative of protein emergence and ongoing evolution.