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Related Concept Videos

Protein Folding01:25

Protein Folding

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Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
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Proteins: From Genes to Degradation02:11

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Within a biological system, the DNA encodes the RNA, and the nucleotide sequence in the RNA further defines the amino acid sequence in the protein. This is referred to as “The Central Dogma of Molecular Biology” - a term coined by Francis Crick.  Central dogma is a firm principle in biology that defines the flow of genetic information within any life form. The two fundamental steps in central dogma are - transcription and translation.
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Mitochondrial Precursor Proteins01:39

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Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
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Conservation of Protein Domains Over Different Proteins02:26

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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.
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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
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Related Experiment Video

Updated: Feb 17, 2026

Application of I TASSER, trRosetta, UCSF Chimera, HADDOCK server, and HEX loria for De Novo and In Silico Design of Proteins
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Application of I TASSER, trRosetta, UCSF Chimera, HADDOCK server, and HEX loria for De Novo and In Silico Design of Proteins

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From ancestral peptides to designed proteins.

Vikram Alva1, Andrei N Lupas1

  • 1Department of Protein Evolution, Max Planck Institute for Developmental Biology, 72076 Tübingen, Germany.

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PubMed
Summary

The origin of protein folding prototypes is explained by their evolution from ancestral peptides involved in RNA replication. This peptide-based origin inspires new protein engineering strategies for novel functions.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Modern protein diversity stems from shuffling and differentiating folding domain prototypes.
  • The evolutionary origin of these fundamental protein prototypes remains largely unknown.

Purpose of the Study:

  • To explore the proposed origin of protein folding prototypes from ancestral peptides.
  • To highlight the role of these peptides in early RNA-based replication and catalysis.
  • To showcase how this evolutionary understanding informs modern protein engineering.

Main Methods:

  • Systematic identification of ancestral peptides.
  • Experimental recapitulation of peptide-to-protein folding mechanisms.

Main Results:

  • Evidence supports the hypothesis that protein prototypes evolved from ancestral peptides.
  • These ancestral peptides likely functioned as cofactors in RNA-based systems.
  • Mechanisms for generating the first folded proteins from peptides have been experimentally demonstrated.

Conclusions:

  • The evolutionary pathway from ancestral peptides to protein folding prototypes is increasingly understood.
  • This peptide-centric view provides a foundation for designing novel proteins with tailored functions and topologies.