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Isolation and characterization of human Nramp cDNA
1Department of Pediatrics, Yamaguchi University School of Medicine, Japan.
Biochemical and Biophysical Research Communications
|November 15, 1994
Summary
Researchers identified the human natural resistance-associated macrophage protein gene (Nramp). This gene is crucial for macrophage function and shows high homology to its mouse counterpart, aiding in understanding immune responses.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- The Lsh/Ity/Bcg gene locus in mice regulates macrophage activation against intracellular pathogens.
- A mouse gene, Nramp, encodes a membrane protein homologous to transport systems, implicated in this regulation.
Purpose of the Study:
- To isolate and characterize the human Nramp gene and its encoded protein.
- To investigate the structural and genomic properties of human Nramp.
Main Methods:
- Screening of a human monocyte cDNA library to isolate human Nramp cDNA.
- Sequence analysis to determine protein characteristics and homology.
- Southern and Northern blot analyses to assess gene copy number and mRNA expression.
Main Results:
- Isolation of a 2245 bp human Nramp cDNA encoding a 483 amino acid protein (52.8 kDa).
- The deduced human Nramp amino acid sequence exhibits 89% homology to mouse Nramp.
- Genomic analysis revealed a single human Nramp gene and a single mRNA transcript of approximately 2.5 kb.
Conclusions:
- The human Nramp gene has been successfully isolated and characterized.
- Human Nramp shares significant structural and genomic similarities with its mouse ortholog.
- These findings provide a basis for further research into Nramp's role in human immunity and disease.