Immunodetection of the toxic portion of Vip3A reveals differential temporal regulation of its secretion among Bacillus thuringiensis strains.

Abstract:

AIMS:To devise a protocol for heterologous expression and purification of a partial toxic portion of the Bacillus thuringiensis (Bt) vegetative insecticidal protein Vip3A and using it as an antigen for anti-Vip3A polyclonal antibody development. Also, to evaluate the regulation of Vip3A secretion into culture supernatants (SNs) of different Bt strains based on this antibody. METHODS AND RESULTS:A primer pair was designed to amplify partially the toxic portion of the vip3A gene from the HD125 strain. The amplicon was cloned in expressing vector to produce a ~35 kDa peptide, which was HPLC-purified prior to rabbit immunizations. The serum containing the polyclonal anti-Vip3A antibody demonstrated a detection sensitivity of 0·4 ng mm-2 for the antigen in slot-blot experiments. Seven Bt strains from different origins were assessed regarding their temporal secretion of Vip3A toxin. ELISA results showed a strain-specific temporal regulation of Vip3A secretion in culture for the temperate isolates, with no detection of the toxin for the tropical strains, even when the presence of the gene was confirmed by PCR and sequencing. CONCLUSIONS:Conformational variation in the toxic portion of Vip3A may explain lack of its detection in the tropical strains. Isolates from the same subspecies display physiological variability in proteins' secretion into culture SNs, which can affect screening procedures for more effective strains/toxins. SIGNIFICANCE AND IMPACT OF THE STUDY:Immunoassays based on the developed anti-Vip3A antibody can be useful in a variety of basic studies. This method can be also coupled with toxicity assays on target insects, for more efficient screening methods of novel Bt strains/toxins with biocontrol applicability.

journal_name

J Appl Microbiol

authors

Argôlo-Filho RC,Loguercio LL

doi

10.1111/jam.13775

subject

Has Abstract

pub_date

2018-08-01 00:00:00

pages

544-553

issue

2

eissn

1364-5072

issn

1365-2672

journal_volume

125

pub_type

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