Functional Proteins from Short Peptides: Dayhoff's Hypothesis Turns 50

Area of Science:

• Biochemistry
• Molecular Biology
• Protein Science

Background:

• Margaret Dayhoff's 1966 hypothesis on protein origins is now an accepted model.
• This model explains the emergence of large, functional proteins from simpler peptides.
• However, the fundamental question of how the very first proteins arose is still unresolved.

Purpose of the Study:

• To explore the unresolved question of the initial emergence of proteins.
• To leverage historical hypotheses and modern data for new insights.
• To build upon Margaret Dayhoff's foundational work in protein science.

Main Methods:

• Utilizing tools and hypotheses pioneered by Margaret Dayhoff.
• Analyzing the current extensive databases of protein sequences (over 65 million).
• Examining the known protein structures (over 12,000) to infer evolutionary pathways.

Main Results:

• The accepted model addresses protein evolution from peptides, but not the origin of the first proteins.
• Extensive sequence and structure data provide a foundation for further research.
• Dayhoff's legacy enables current researchers to tackle the primordial protein emergence question.

Conclusions:

• While Dayhoff's model is validated for protein evolution, the origin of the first proteins requires further study.
• The vast amount of available protein data is crucial for future investigations.
• Contemporary research stands on the shoulders of pioneers like Dayhoff to address fundamental biological questions.