Expression of a synthetic gene for the major cytotoxin (Cyt1Aa) of Bacillus thuringiensis subsp. israelensis in the chloroplast of wild-type chlamydomonas

Seongjoon Kang, Obed W. Odom, Candice L. Malone, Saravanan Thangamani, David L. Herrin

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Chlamydomonas reinhardtii (Chlamydomonas) strains that are toxic to mosquito larvae because they express chloroplast transgenes that are based on the mosquitocidal proteins of Bacillus thuringiensis subsp. israelensis (Bti) could be very useful in mosquito control. Chlamydomonas has several advantages for this approach, including genetic controls not generally available with industrial algae. The Bti toxin is produced by sporulating bacteria and has been used for mosquito control for >30 years without creating highly resistant mosquito populations. The suite of toxins is four main proteins: three Cry proteins and the cytotoxic Cyt1Aa (27 kDa). Cyt1Aa is not very toxic to mosquitoes by itself, but it prevents the development of resistance. The production of Cyt1Aa in other microbes, however, has been challenging due to its affinity for certain membrane phospholipids. Here we report on the production of recombinant Cyt1Aa (rCyt1A) in the chloroplast of photosynthetic Chlamydomonas at levels of at least 0.3% total protein. Live cell bioassays demonstrated toxicity of the rCyt1Aa Chlamydomonas to larvae of Aedes aegypti. We also expressed the chloroplast cyt1Aa gene in a wild-type Chlamydomonas strain (21 gr) that can grow on nitrate. These results have implications for developing a Chlamydomonas strain that will be toxic to mosquito larvae but will not induce strongly resistant populations.

Original languageEnglish (US)
Article number29
JournalBiology
Volume7
Issue number2
DOIs
StatePublished - Jun 1 2018

Fingerprint

Synthetic Genes
Bacillus thuringiensis subsp. israelensis
synthetic genes
Chlamydomonas
cytotoxins
Bacillus thuringiensis
Cytotoxins
Bacilli
Chloroplasts
Mosquito control
Poisons
chloroplasts
Genes
Culicidae
Mosquito Control
Larva
Proteins
mosquito control
algae
Bioassay

Keywords

  • Bacillus thuringiensis subsp
  • Biolarvacide
  • Chlamydomonas
  • Cyt1Aa
  • Green alga
  • Israelensis
  • Pest control
  • West Nile
  • Zika

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Immunology and Microbiology(all)
  • Agricultural and Biological Sciences(all)

Cite this

Expression of a synthetic gene for the major cytotoxin (Cyt1Aa) of Bacillus thuringiensis subsp. israelensis in the chloroplast of wild-type chlamydomonas. / Kang, Seongjoon; Odom, Obed W.; Malone, Candice L.; Thangamani, Saravanan; Herrin, David L.

In: Biology, Vol. 7, No. 2, 29, 01.06.2018.

Research output: Contribution to journalArticle

Kang, Seongjoon ; Odom, Obed W. ; Malone, Candice L. ; Thangamani, Saravanan ; Herrin, David L. / Expression of a synthetic gene for the major cytotoxin (Cyt1Aa) of Bacillus thuringiensis subsp. israelensis in the chloroplast of wild-type chlamydomonas. In: Biology. 2018 ; Vol. 7, No. 2.
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