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Conservation of Protein Domains Over Different Proteins

Conservation of Protein Domains Over Different Proteins

Protein domains are small structurally independent units that are part of a single amino acid chain. Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to...

Protein Organization

Protein Organization

Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence....

Protein Families

Protein Families

Protein families are groups of homologous proteins; that is, they have similarities in amino acid sequences and three-dimensional structures. Protein families usually occur because of gene duplication, where an additional copy of a gene is inserted into the genome of an organism. Mutations that change the amino acids but still allow the protein to be properly synthesized, will lead to new protein family members. If these new proteins contain similar amino acids in key...

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Conservation of Protein Domains

Conservation of Protein Domains

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Related Experiment Video

Updated: May 29, 2025

Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web

Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web

Published on: July 16, 2017

A building blocks perspective on protein emergence and evolution.

Yishi Ezerzer¹, Moran Frenkel-Pinter², Rachel Kolodny³

¹Institute of Chemistry, The Hebrew University of Jerusalem, 9190401, Israel.

Current Opinion in Structural Biology

|February 7, 2025

Summary

Proteins likely evolved from short peptide building blocks. Researchers explore their origins and evolution using bottom-up and protein space analyses to understand ancient molecular structures and evolutionary mechanisms.

Keywords:

Ancestral peptides Origin of life Prebiotic chemistry Primordial peptides Protein domains Protein space

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Protein WISDOM: A Workbench for In silico De novo Design of BioMolecules

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Published on: July 25, 2013

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Last Updated: May 29, 2025

Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web

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Published on: July 16, 2017

Optimization of Synthetic Proteins: Identification of Interpositional Dependencies Indicating Structurally and/or Functionally Linked Residues

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Published on: July 14, 2015

Protein WISDOM: A Workbench for In silico De novo Design of BioMolecules

Protein WISDOM: A Workbench for In silico De novo Design of BioMolecules

Published on: July 25, 2013

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.