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Nucleotide sequence of streptococcal pyrogenic exotoxin type C.

S C Goshorn¹, P M Schlievert

¹Department of Microbiology, University of Minnesota Medical School, Minneapolis 55455.

Infection and Immunity

|September 1, 1988

Summary

The gene speC, encoding streptococcal pyrogenic exotoxin type C (SPE C), was sequenced. SPE C showed the most homology with streptococcal exotoxin type A among related toxins.

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Area of Science:

Microbiology
Molecular Biology
Genetics

Background:

Streptococcal pyrogenic exotoxins (SPEs) are virulence factors associated with various Streptococcus pyogenes infections.
Understanding the genetic basis and molecular characteristics of SPEs is crucial for developing targeted interventions.

Purpose of the Study:

To determine the nucleotide sequence of the speC gene, which encodes streptococcal pyrogenic exotoxin type C (SPE C).
To analyze the amino acid sequence of mature SPE C and compare its homology with other related exotoxins.

Main Methods:

Gene sequencing to determine the nucleotide sequence of speC.
Bioinformatic analysis to predict the amino acid sequence and molecular weight of the mature SPE C protein.
Homology analysis comparing SPE C with streptococcal pyrogenic exotoxin type A, staphylococcal enterotoxins, and toxic shock syndrome toxin-1.

Main Results:

The nucleotide sequence of the speC gene was successfully determined.
The gene encodes a mature protein of 208 amino acids with a molecular weight of 24,354 Da.
SPE C exhibited the highest degree of amino acid sequence homology with streptococcal exotoxin type A compared to other analyzed toxins.

Conclusions:

The genetic and molecular characterization of SPE C provides insights into its structure and potential function.
The observed homology suggests potential shared evolutionary origins or functional similarities between SPE C and streptococcal exotoxin type A.

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