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. 1988 Aug;56(8):1934–1941. doi: 10.1128/iai.56.8.1934-1941.1988

ADP-ribosyltransferase mutations in the catalytic S-1 subunit of pertussis toxin.

J T Barbieri 1, G Cortina 1
PMCID: PMC259504  PMID: 3135265

Abstract

The ADP-ribosyltransferase activity of pertussis toxin resides within the S-1 subunit of the toxin. Deletion mapping of a recombinant S-1 subunit produced in Escherichia coli showed that amino acids 2 through 180 are required for ADP-ribosylation of Gi protein. Mutants of the S-1 subunit which lacked either amino acids 2 through 22 or amino acids 153 through 180 failed to express enzyme activity, implicating a functional or structural role for these residues in catalysis. The catalytic carboxy-terminal S-1 deletion, C-180, was found to be more soluble than the recombinant S-1 subunit, making it a useful construct for future structure-function studies on enzyme catalysis. Four independent single-amino-acid substitutions which decreased ADP-ribosyltransferase activity were constructed in the recombinant S-1 subunit. Substitution of Asp-11 by Ser, Arg-13 by Leu, or Trp-26 by Ile decreased enzyme activity to below detectable levels (less than 1.0% of that of the recombinant S-1 subunit). The Glu-139-to-Ser substitution reduced ADP-ribosyltransferase activity to 15% of that of the recombinant S-1 subunit. Both the oxidized and reduced forms of the recombinant S-1 subunit and recombinant S-1 subunits containing single-amino-acid substitutions were degraded through identical immunoreactive tryptic peptides, suggesting that the conformations of the mutants are similar to that of the recombinant S-1 subunit. Identification of noncatalytic forms of the S-1 subunit of pertussis toxin which have conserved protein structure is an initial step in the generation of a recombinant noncatalytic form of pertussis toxin which may be tested as a candidate for an acellular vaccine against Bordetella pertussis.

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Selected References

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