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Two forms of phospholipase C-beta 1 generated by alternative splicing

Y Y Bahk1, Y H Lee, T G Lee

  • 1Department of Life Science, Pohang University of Science and Technology, Kyungbuk, South Korea.

The Journal of Biological Chemistry
|March 18, 1994
PubMed
Summary

Phospholipase C-beta 1 (PLC-beta 1) in rat brain is produced from a single gene through alternative RNA splicing, resulting in two distinct protein isoforms (PLC-beta 1a and PLC-beta 1b). These isoforms, differing in carboxyl-terminal sequences, are expressed in brain and glioma cells.

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Area of Science:

  • Molecular Biology
  • Neuroscience
  • Biochemistry

Background:

  • Phospholipase C-beta 1 (PLC-beta 1) is a key enzyme involved in signal transduction.
  • PLC-beta 1 exists as two protein forms (150 and 140 kDa) in rat brain, encoded by distinct transcripts.

Purpose of the Study:

  • To characterize the cDNA and protein products of the 7.2-kb PLC-beta 1 transcript.
  • To determine the relationship between the two PLC-beta 1 transcripts and their corresponding protein isoforms.
  • To investigate the expression of PLC-beta 1 isoforms in different tissues.

Main Methods:

  • Isolation and sequencing of cDNAs corresponding to the 7.2-kb PLC-beta 1 transcript.
  • Generation of isozyme-specific antibodies against synthetic peptides.
  • Immunoblot analysis to detect and differentiate PLC-beta 1a and PLC-beta 1b expression.

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  • Genomic DNA analysis to elucidate the gene structure.

    • Main Results:

    • The 7.2-kb transcript encodes a 1173-amino acid polypeptide (PLC-beta 1b) with a distinct carboxyl-terminal sequence compared to the 1216-amino acid polypeptide (PLC-beta 1a) from the 5.4-kb transcript.
    • Both PLC-beta 1a and PLC-beta 1b were detected in rat brain and C6Bu-1 glioma cells.
    • PLC-beta 1a corresponds to the 150-kDa enzyme and PLC-beta 1b to the 140-kDa enzyme.
    • Analysis indicates that both isoforms are derived from a single gene via alternative RNA splicing.

    Conclusions:

    • Rat brain expresses two distinct PLC-beta 1 isoforms, PLC-beta 1a and PLC-beta 1b, arising from alternative splicing of a single gene.
    • Alternative RNA splicing provides a mechanism for generating protein diversity from the PLC-beta 1 gene, potentially leading to differential functions.