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The primary structure of mouse saposin.
1Department of Pediatrics, Nihon University, School of Medicine, Tokyo, Japan.
Biochemical and Biophysical Research Communications
|May 15, 1992
Summary
Researchers determined the primary structure of mouse sphingolipid activator protein (saposin) using cDNA sequencing. Mouse saposin shares high homology with human saposin, featuring four similar functional domains and mRNA heterogeneities.
Area of Science:
- Biochemistry
- Molecular Biology
- Genomics
Background:
- Sphingolipid activator proteins (saposins) are crucial for lysosomal lipid metabolism.
- Understanding saposin structure is key to elucidating sphingolipidosis pathogenesis.
Purpose of the Study:
- To determine the primary structure of mouse sphingolipid activator protein (saposin).
- To compare the structural features of mouse saposin with its human and rat counterparts.
Main Methods:
- cDNA sequencing was employed to determine the primary amino acid sequence of mouse saposin.
- Bioinformatic analysis was used for sequence comparison and domain identification.
Main Results:
- The predicted amino acid sequence of mouse saposin shows high homology to human saposin (~70% similarity) and rat sertoli cell glycoprotein.
- Mouse saposin possesses four structurally similar functional domains, each containing conserved cysteines, prolines, and potential glycosylation sites.
- Human saposin exhibits a deletion of thirty-one amino acids between domains C and D compared to mouse saposin.
- Messenger RNA (mRNA) heterogeneities were identified in both coding and noncoding regions of mouse saposin.
Conclusions:
- The structural and sequence similarities suggest conserved functions between mouse and human saposins.
- The identified domain structure and conserved residues provide insights into saposin's mechanism of action.
- mRNA heterogeneities may indicate post-transcriptional regulatory mechanisms affecting saposin expression.