Related Experiment Videos
Structural comparisons between mouse and human prealbumin
Abstract:
In an attempt to construct model systems for familial amyloidotic polyneuropathy, prealbumin cDNA was cloned from a mouse liver cDNA library, using previously cloned human prealbumin cDNA as a hybridization probe. The primary structure of mouse prealbumin deduced from the cDNA sequence shows that it consists of 147 amino acids, including a whole prealbumin sequence (127 amino acids) and a putative signal sequence (20 amino acids). These numbers are in complete agreement with those determined for the human prealbumin. Among the 127 amino acid residues of the mature human prealbumin, 25 are replaced by different amino acids in the mouse prealbumin. Interestingly, 24 out of the 25 substituted amino acids are located at the outer surface of the protein, and the regions corresponding to the core and central channel of the protein are almost completely conserved. The cloned cDNA provided essential information for manipulating amyloidosis in mice.
Insights
Researchers cloned mouse prealbumin cDNA to create models for familial amyloidotic polyneuropathy. This mouse prealbumin shares structural similarities with human prealbumin, aiding in amyloidosis research.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Familial amyloidotic polyneuropathy (FAP) is a debilitating disease.
- Mouse models are crucial for understanding and treating human diseases.
Purpose of the Study:
- To clone mouse prealbumin cDNA for developing FAP model systems.
- To analyze the structural differences between mouse and human prealbumin.
Main Methods:
- Cloning mouse prealbumin cDNA using human prealbumin cDNA as a probe.
- Deducing primary protein structure from cDNA sequence analysis.
Main Results:
- Mouse prealbumin consists of 147 amino acids (127 mature, 20 signal sequence), similar to human prealbumin.
- 25 amino acid substitutions were found in mouse prealbumin compared to human.
- Most substitutions are on the protein's surface, with conserved core and channel regions.
Conclusions:
- The cloned mouse prealbumin cDNA is valuable for creating FAP models.
- Structural conservation suggests functional similarities relevant to amyloidosis research.