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Related Experiment Videos

Can an arbitrary sequence evolve towards acquiring a biological function?

Yuuki Hayashi1, Hiroshi Sakata, Yoshihide Makino

  • 1Department of Biotechnology, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, 565-0871, Suita City, Osaka, Japan.

Journal of Molecular Evolution
|February 8, 2003
PubMed
Summary
This summary is machine-generated.

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This study demonstrates that random polypeptide sequences can evolve to gain function. Experimental evolution improved a defective phage

Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Protein Engineering

Background:

  • The origin of functional proteins from arbitrary sequences is a key question in molecular evolution.
  • Bacteriophage fd serves as a model system for studying protein function and evolution.

Purpose of the Study:

  • To investigate if an arbitrary polypeptide sequence can evolve a functional role when integrated with existing protein modules.
  • To explore the evolvability of a random polypeptide sequence within a phage genome.

Main Methods:

  • Replaced the D2 domain of the fd-tet phage genome with a soluble random polypeptide (RP3-42).
  • Subjected the resulting defective phage (fd-RP) to iterative rounds of mutation and selection for infectivity.
  • Analyzed the evolved phage (fd-7) for changes in infectivity and molecular properties.

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Main Results:

  • The initial replacement resulted in a phage with significantly reduced infectivity (six orders of magnitude lower).
  • Experimental evolution led to a 240-fold increase in infectivity for the evolved clone fd-7 compared to its origin.
  • A 37-fold increase in infectivity was attributed to alterations in the molecular properties of the inserted random polypeptide.

Conclusions:

  • Arbitrary polypeptide sequences can evolve to acquire functional roles when fused with pre-existing protein modules.
  • This study provides an experimental example of de novo functional evolution from random sequences.
  • The findings offer new perspectives on the role of primordial polypeptides in early molecular evolution.