Pertussis toxin analog with reduced enzymatic and biological activities is a protective immunogen.

Infection and Immunity
A KimuraJ L Cowell

Abstract

Bordetella pertussis TOX3201 has a 12-base-pair insertion in the S1 subunit gene of pertussis toxin (PTX), which encodes for a 4-amino-acid insertion between residues 107 and 108 of the mature S1 subunit (Black et al., Science 240:656-659, 1988). This mutant strain has been shown to secrete a holotoxin analog of PTX, designated CRM3201, with reduced ADP-ribosyltransferase activity. In the present study, we evaluated the biochemical, biological, and immunoprotective activities of purified CRM3201. Assay of enzymatic activities showed that CRM3201 had 20 to 30% of the ADP-ribosyltransferase activity and 55 to 60% of the NAD glycohydrolase activity of native PTX. CRM3201, however, had only 2 to 6% of the activity of PTX in clustering CHO cells, promoting leukocytosis, inducing histamine sensitization, and potentiating an anaphylactic response to bovine serum albumin. In contrast, activities associated with the B oligomer (binding to fetuin, hemagglutination of goose erythrocytes, and lymphocyte mitogen activity) were comparable to those of native PTX. Injection of BALB/c mice with CRM3201 mixed with Al(OH)3 elicited high titers of antibody to PTX (as measured by enzyme-linked immunosorbent assay), which neutralized a leukocytosis-...Continue Reading

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Citations

Sep 1, 1994·Nature Structural Biology·P E SteinR J Read
Jul 24, 2012·Toxins·Siu-Kei Chow, Arturo Casadevall
Oct 24, 2003·Infection and Immunity·Nicholas H CarbonettiZoe E V Worthington
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