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Molecular cloning and characterization of a cDNA encoding the Paracoccidioides brasiliensis 135 ribosomal protein

Rosália S A Jesuino1, Maristela Pereira, M Sueli S Felipe

  • 1Laboratório de Biologia Molecular, Universidade Federal de Goiás, Goiânia, Goiás, Brazil.

Medical Mycology
|July 31, 2004
PubMed

Insights

Researchers identified and cloned the Pbl35 gene, encoding a ribosomal protein in Paracoccidioides brasiliensis. This marks the first description of a ribosomal protein in this fungus, crucial for understanding its cellular machinery.

Area of Science:

  • Molecular Biology
  • Mycology
  • Biochemistry

Background:

  • Paracoccidioides brasiliensis is a significant fungal pathogen.
  • Ribosomal proteins are essential components of the cellular machinery responsible for protein synthesis.
  • Understanding fungal ribosomal proteins aids in developing targeted therapies.

Purpose of the Study:

  • To clone and characterize a ribosomal protein (L35) from Paracoccidioides brasiliensis.
  • To analyze the sequence and potential function of the identified protein.
  • To establish a molecular basis for ribosomal protein research in P. brasiliensis.

Main Methods:

  • Cloning of a 630 bp cDNA encoding Pbl35 from a yeast expression library.
  • Bioinformatic analysis of the deduced amino acid sequence.
  • Assessment of mRNA expression levels.

Main Results:

  • The Pbl35 gene encodes a 125-amino acid polypeptide with a molecular mass of 14.5 kDa and a pI of 11.0.
  • The deduced PbL35 protein shows high conservation with other eukaryotic and prokaryotic L35 ribosomal proteins.
  • A bipartite nuclear localization signal (NLS) was identified, suggesting nucleolar localization for ribosome assembly.
  • PbL35 mRNA is highly expressed in P. brasiliensis.

Conclusions:

  • This study presents the first characterization of a ribosomal protein, Pbl35, in Paracoccidioides brasiliensis.
  • The findings provide a foundation for further research into the fungal ribosome structure and function.
  • The conserved nature and NLS motif of PbL35 suggest its critical role in ribosomal biogenesis.

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