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Cell-free translation of human renin mRNA
Abstract:
The molecular weight of human renin precursor (preprorenin) was determined to be 43,000 by cell-free translation of its mRNA. Poly(A)+-containing RNA from human infarcted kidney was translated in a cell-free reticulocyte lysate system containing [35S] methionine. Immunoprecipitation with anti-renin antibody gave one major band with an apparent Mr = 43,000, as determined by sodium dodecyl sulfate (SDS)-polyacrylamide gel electrophoresis and fluorography. The specific band, which represents the prepro-form of human renal renin, was very similar to mouse submandibular gland preprorenin in its electrophoretic mobility.
Insights
Researchers determined the molecular weight of human renin precursor (preprorenin) to be 43,000 Daltons using cell-free translation. This finding aids in understanding the initial form of this important kidney enzyme.
Area of Science:
- Biochemistry
- Molecular Biology
- Renal Physiology
Background:
- Human renin is a key enzyme in the renin-angiotensin-aldosterone system, regulating blood pressure.
- Understanding the precursor form (preprorenin) is crucial for studying renin synthesis and regulation.
- Previous studies have not precisely determined the molecular weight of human preprorenin.
Purpose of the Study:
- To determine the molecular weight of human preprorenin.
- To characterize the prepro-form of human renal renin using molecular biology techniques.
Main Methods:
- Cell-free translation of messenger RNA (mRNA) from human infarcted kidney using a reticulocyte lysate system.
- Incorporation of [35S]methionine for radiolabeling.
- Immunoprecipitation using anti-renin antibody.
- Analysis by sodium dodecyl sulfate (SDS)-polyacrylamide gel electrophoresis and fluorography.
Main Results:
- A major protein band with an apparent molecular weight (Mr) of 43,000 was identified.
- This band represents the prepro-form of human renal renin.
- The electrophoretic mobility of human preprorenin was similar to that of mouse submandibular gland preprorenin.
Conclusions:
- The molecular weight of human preprorenin is 43,000 Daltons.
- The characterized preprorenin is the initial translation product of human renin mRNA.
- Human and mouse preprorenins share similar electrophoretic properties, suggesting conserved structural features.