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CDNA for an immune response gene encoding low molecular weight polypeptide from flounder, Paralichthys olivaceus

J J Cho1, B K Sung, J H Lee

  • 1Department of Microbiology, Pukyong National University, Pusan, Korea.

Molecules and Cells
|May 18, 2001
PubMed

Insights

Researchers cloned and sequenced the low molecular weight polypeptide 7 (LMP7) immune gene from flounder. This fish LMP7 gene is conserved across species and expressed in key immune tissues.

Area of Science:

  • Immunology
  • Molecular Biology
  • Marine Biology

Background:

  • The immune system relies on specific genes to respond to pathogens.
  • Low Molecular Weight Polypeptide 7 (LMP7) is a crucial component of the proteasome, involved in antigen processing.

Purpose of the Study:

  • To clone and characterize the cDNA of the LMP7 gene in flounder (Paralichthys olivaceus).
  • To analyze the evolutionary conservation and tissue-specific expression of flounder LMP7.

Main Methods:

  • cDNA library construction and sequencing.
  • Bioinformatic analysis including ScanProsite and phylogenetic tree construction.
  • Reverse transcription-polymerase chain reaction (RT-PCR) for gene expression analysis.

Main Results:

  • A 1,160 bp cDNA clone encoding flounder LMP7 was successfully sequenced, revealing an 822 bp open reading frame for a 273-amino acid protein (30.5 kDa).
  • Sequence analysis confirmed the presence of a conserved proteasome beta-type subunit signature.
  • Flounder LMP7 showed significant sequence identity with homologous genes in zebrafish (66%) and Xenopus laevis (57%).
  • RT-PCR detected LMP7 expression in flounder liver, kidney, leukocytes, and spleen.

Conclusions:

  • The flounder LMP7 gene is structurally similar to mammalian counterparts and evolutionarily conserved.
  • LMP7 is expressed in various immune-related tissues in flounder, suggesting its role in the fish immune response.

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