Related Experiment Videos
[Structural and function of the human macrophage scavenger receptor]
H Asaoka1, A Matsumoto, H Itakura
1Third Department of Internal Medicine, University of Tokyo.
Nihon Rinsho. Japanese Journal of Clinical Medicine
|June 1, 1993
Summary
Macrophage scavenger receptors (MSR) bind and internalize macromolecules. Their gene structure, with exons encoding functional domains, influences ligand recognition and receptor type.
Area of Science:
- Molecular Biology
- Immunology
- Genetics
Context:
- Macrophage scavenger receptors (MSR) are crucial for cellular uptake of negatively charged macromolecules.
- These receptors are trimers composed of subunits with distinct functional domains.
Purpose:
- To elucidate the structural organization of the human MSR gene.
- To understand how alternative splicing and exon arrangement contribute to MSR functional diversity.
Summary:
- The human MSR gene comprises 11 exons, encoding six functional domains: cytoplasmic, transmembrane, spacer, alpha-helical coiled-coil, collagen-like, and a type-specific domain.
- Alternative splicing of exon 8 generates two mRNA types (I and II), influencing MSR structure and function.
- The collagen-like domain's C-terminal region is critical for MSR ligand recognition, with its structure dictated by exon arrangement.
Impact:
- Provides insights into the genetic basis of MSR diversity and function.
- Highlights the role of alternative splicing in generating distinct receptor isoforms.
- Contributes to understanding the molecular mechanisms of innate immunity and lipoprotein metabolism.