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Related Experiment Videos

Human and mouse LSP1 genes code for highly conserved phosphoproteins.

J Jongstra-Bilen1, A J Young, R Chong

  • 1Department of Immunology, University of Toronto, Ontario, Canada.

Journal of Immunology (Baltimore, Md. : 1950)
|February 1, 1990
PubMed
Summary

Researchers identified a human LSP1 gene homologue, revealing conserved protein domains and phosphorylation sites crucial for function. Human LSP1 is a phosphoprotein, with potential functional conservation despite sequence variations in calcium-binding sites.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Protein Biochemistry

Background:

  • The Lymphocyte Specific Protein 1 (LSP1) gene plays a role in cellular functions.
  • Understanding the human homologue of LSP1 is essential for comparative genomics and functional studies.

Purpose of the Study:

  • To isolate and characterize the human homologue of the mouse LSP1 gene.
  • To compare the structural and functional features of human and mouse LSP1 proteins.
  • To investigate the genomic organization and expression patterns of the human LSP1 gene.

Main Methods:

  • Isolation of human LSP1 cDNA from a human CTL cDNA library.
  • Sequence comparison between human and mouse LSP1 proteins.
  • Immunoprecipitation assays to detect protein phosphorylation.

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  • Southern blot analysis of human genomic DNA.

    • Main Results:

    • Human LSP1 protein shares conserved C-terminal domains and phosphorylation sites with mouse LSP1.
    • Both human and mouse LSP1 proteins are phosphoproteins.
    • While Ca2(+)-binding sites differ, functional conservation is suggested.
    • Human genome contains multiple LSP1-related genes, unlike the mouse genome.

    Conclusions:

    • Human LSP1 protein exhibits significant homology to its mouse counterpart, particularly in the C-terminal domain.
    • LSP1 proteins are post-translationally modified via phosphorylation.
    • The human genome harbors a family of LSP1-related genes, indicating evolutionary expansion.