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Two transcripts encode rat cytochrome b5 reductase.

G Pietrini1, P Carrera, N Borgese

  • 1Consiglio Nazionale delle Ricerche, Center for Cytopharmacology, University of Milan, Italy.

Proceedings of the National Academy of Sciences of the United States of America
|October 1, 1988
PubMed
Summary
This summary is machine-generated.

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Researchers identified the full coding sequence for rat cytochrome b5 reductase. This enzyme is not made as a precursor and a single gene likely codes for its soluble and membrane-bound forms.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Cytochrome b5 reductase (Cb5R) exists in soluble and membrane-bound forms.
  • Understanding the genetic basis and transcript variations of Cb5R is crucial for cellular function.

Purpose of the Study:

  • To clone and sequence the full-length cDNA of rat cytochrome b5 reductase.
  • To investigate the gene structure and mRNA transcripts of Cb5R in different tissues.

Main Methods:

  • Screening of a lambda gt11 cDNA expression library using anti-rat Cb5R antibodies.
  • RNA and Southern blot analyses.
  • RNase A protection experiments with antisense RNA probes.

Main Results:

  • Isolation of overlapping cDNA clones encoding the complete rat Cb5R coding sequence.

Related Experiment Videos

  • High sequence similarity (93%) between rat, bovine, and human Cb5R.
  • Evidence for a single gene encoding both soluble and membrane-bound Cb5R forms.
  • Detection of a single Cb5R mRNA transcript in liver, but two transcripts in reticulocytes.

    • Conclusions:

    • Rat Cb5R is not synthesized as a high molecular weight precursor.
    • A single gene likely codes for both soluble and membrane-bound Cb5R isoforms.
    • Differential mRNA processing in reticulocytes may generate the soluble Cb5R form.