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A rainbow trout lectin with multimeric structure

L E Jensen1, S Thiel, T E Petersen

  • 1Department of Medical Microbiology and Immunology, University of Aarhus, Denmark.

Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
|April 1, 1997
PubMed
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Researchers discovered a novel rainbow trout serum lectin, named "ladderlectin," which binds to Sepharose in a calcium-dependent way and exhibits a unique banded pattern on SDS-PAGE.

Area of Science:

  • Biochemistry
  • Immunology
  • Proteomics

Background:

  • Lectins are proteins with carbohydrate-binding domains.
  • Rainbow trout (Oncorhynchus mykiss) possess a complex immune system with various lectins.
  • Characterization of novel lectins aids in understanding immune responses and molecular interactions.

Purpose of the Study:

  • To identify and characterize a novel lectin from rainbow trout serum and plasma.
  • To determine the carbohydrate-binding specificity and structural properties of the identified lectin.
  • To propose a name for the novel protein based on its characteristics.

Main Methods:

  • Calcium-dependent binding assays with Sepharose.
  • Inhibition studies using various carbohydrates.

Related Experiment Videos

  • Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) under reducing and non-reducing conditions.
  • Size-exclusion chromatography.
  • NH2-terminal amino acid sequencing.

    • Main Results:

    • A novel lectin was identified in rainbow trout serum and plasma.
    • The lectin exhibits calcium-dependent binding to Sepharose, inhibited by glucose, N-acetyl-glucosamine, mannose, and other related sugars.
    • SDS-PAGE revealed a characteristic ladder of bands under non-reducing conditions, resolving to a 16-kDa band upon reduction.
    • Size-exclusion chromatography indicated a large molecular size (2000 kDa to <200 kDa).
    • NH2-terminal sequencing showed no significant homology to known proteins.

    Conclusions:

    • The novel rainbow trout lectin, named "ladderlectin," possesses unique structural and binding properties.
    • Its characteristic SDS-PAGE pattern and carbohydrate specificity suggest a distinct functional role.
    • Further research into ladderlectin could elucidate its specific functions in the rainbow trout immune system.