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The PUF RNA-binding protein, FBF-2, maintains stem cells without binding to RNA.

Brian H Carrick1, Sarah L Crittenden2, MaryGrace Linsley2

  • 1Department of Biochemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA bcarrick@mrc-lmb.cam.ac.uk jekimble@wisc.edu.

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Even without binding RNA, the FBF-2 protein remains active and sustains stem cells. Protein interactions can compensate for lost RNA binding, challenging established RBP activity models.

Keywords:
C. elegansPUF RNA-binding proteinPUF partnershipsgermline stem cellssperm/oocyte cell fate decision

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Area of Science:

  • Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • Canonical PUF proteins, including Caenorhabditis elegans FBF-2, bind specific RNAs through tripartite recognition motifs.
  • RNA-binding proteins (RBPs) are generally believed to require RNA binding for biological activity.

Purpose of the Study:

  • To investigate the biological activity of an FBF-2 mutant protein lacking RNA-binding capacity.
  • To determine the role of protein-protein interactions in FBF-2 function.
  • To challenge the conventional understanding of RBP activity mechanisms.

Main Methods:

  • Generation of an FBF-2 mutant protein defective in RNA binding.
  • Assessment of the biological activity of the mutant protein in maintaining stem cells.
  • Analysis of FBF-2 interactions with partner proteins.

Main Results:

  • An FBF-2 mutant unable to bind RNA was found to be biologically active and capable of maintaining stem cells.
  • Protein-protein interactions were shown to compensate for the loss of RNA-binding ability.
  • FBF-2 lost biological activity only when both RNA-binding and partner interactions were compromised.

Conclusions:

  • RNA binding is not strictly required for the biological activity of all RBPs, including FBF-2.
  • Protein-partner interactions play a crucial, compensatory role in RBP function.
  • The activity of RBPs arises from a combination of RNA-binding and protein-interaction mechanisms.