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Related Experiment Videos

Complementation of divergent mga genes in group A Streptococcus

G Andersson1, K McIver, L O Hedén

  • 1Department of Microbiology, Lund University, Sweden.

Gene
|October 10, 1996
PubMed
Summary

The Streptococcus pyogenes mga4 gene encodes a Mga4 protein that activates emm gene transcription. Mga4 shares high similarity with Mga1, but lacks a C-terminal receiver domain, yet still activates emm transcription, indicating this domain is not critical.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Streptococcus pyogenes utilizes Mga (M protein gene regulator) to control virulence gene expression.
  • Mga1 is a known positive regulator of the emm gene, crucial for M protein production.
  • Understanding Mga protein function is key to deciphering S. pyogenes pathogenesis.

Purpose of the Study:

  • To clone and characterize the mga4 gene from Streptococcus pyogenes M type 4 strain AP4.
  • To investigate the functional role of the Mga4 protein in regulating emm gene transcription.
  • To compare the structural and functional characteristics of Mga4 with the prototype Mga1.

Main Methods:

  • Gene cloning and sequencing of mga4 from S. pyogenes AP4.
  • Deduced amino acid sequence analysis and comparison with Mga1.

Related Experiment Videos

  • Complementation assays to assess Mga4's ability to activate emm transcription in trans.

    • Main Results:

    • The mga4 gene was successfully cloned and sequenced.
    • The deduced Mga4 protein sequence showed 88% identity to Mga1 in the N-terminal half, containing helix-turn-helix domains.
    • A C-terminal receiver domain present in Mga1 was not conserved in Mga4.
    • Mga4 complemented a mutation in mga1, activating emm gene transcription.

    Conclusions:

    • The mga4 gene encodes a functional positive regulatory protein, Mga4.
    • The C-terminal receiver domain of Mga1 is not essential for activating emm gene transcription.
    • Mga4 represents a divergent Mga protein with conserved regulatory function.