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Structure of the murine gene encoding apolipoprotein A-I
1Upjohn Laboratories, Kalamazoo, MI 49007.
Gene
|August 15, 1992
Summary
Researchers cloned and sequenced the mouse apolipoprotein A-I gene. This study reveals its structure and compares it to rat and human apolipoprotein A-I, finding conserved structural features despite moderate sequence identity.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Apolipoprotein A-I (ApoA-I) is crucial for high-density lipoprotein (HDL) metabolism.
- Understanding ApoA-I gene structure and function across species aids in comprehending lipid disorders.
Purpose of the Study:
- To clone and sequence the gene encoding mouse apolipoprotein A-I (ApoA-I).
- To analyze the structural and compositional characteristics of mouse ApoA-I.
- To compare mouse ApoA-I with its rat and human counterparts.
Main Methods:
- DNA fragment cloning and sequencing (1.6-kb).
- Gene structure analysis (exons and introns).
- Amino acid sequence and composition analysis.
- Protein structure prediction (Kyte-Doolittle analysis).
Main Results:
- The mouse ApoA-I gene contains three exons and two introns.
- It encodes a 262 amino acid (aa) precursor, yielding a mature protein of 238 aa.
- Mouse ApoA-I shares 71% and 66% identity with rat and human ApoA-I, respectively.
- All three proteins exhibit identical isoelectric points (pIs) of 5.4 and similar structures.
Conclusions:
- The mouse ApoA-I gene structure is conserved.
- Structural similarities suggest conserved function across mammalian species.
- This provides a basis for further studies on ApoA-I in mouse models.