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Self from nonself discrimination in single-celled eukaryotes.

P Luporini1, C Miceli, S Raffioni

  • 1Department of Cell Biology, University of Camerino, Italy.

Parassitologia
|August 1, 1986
PubMed
Summary
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Marine ciliates like Euplotes raikovi use mating pheromones for self-recognition. These small, acidic proteins, active at extremely low concentrations, play a key role in controlling mating type interactions.

Area of Science:

  • * Marine biology
  • * Molecular genetics
  • * Cell biology

Background:

  • * Mating type interactions in the marine ciliate Euplotes raikovi are controlled by a self-recognition mechanism.
  • * This mechanism involves mating pheromones inherited via high-multiple alleles, codominant at the Mendelian locus mat.

Purpose of the Study:

  • * To isolate, purify, and characterize the mating pheromones involved in Euplotes raikovi mating interactions.
  • * To investigate the biochemical properties and structural features of these pheromones.

Main Methods:

  • * Isolation and purification of mating pheromones.
  • * Protein characterization including molecular weight (Mr) and isoelectric point (pI) determination.
  • * Preliminary amino acid sequencing.

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Main Results:

  • * Four mating pheromones were isolated and purified.
  • * Pheromones are small, acidic proteins (Mr, 11,000-12,000; pI, 3.7-4.0).
  • * High activity was observed at concentrations as low as 10(-12) molar.
  • * Preliminary sequencing revealed extensive structural homologies and aspartic acid at the amino terminus.

Conclusions:

  • * Mating pheromones are crucial molecules in Euplotes raikovi mating recognition.
  • * The identified pheromones possess unique biochemical properties and structural characteristics.
  • * Further research into amino acid sequences will elucidate detailed structural homologies and their role in mating specificity.