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Molecular Cloning of α-Amylases from Cotton Boll Weevil, Anthonomus grandis and Structural Relations to Plant Inhibitors: An Approach to Insect Resistance

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Abstract

Anthonomus grandis, the cotton boll weevil, causes severe cotton crop losses in North and South America. Here we demonstrate the presence of starch in the cotton pollen grains and young ovules that are the main A. grandis food source. We further demonstrate the presence of α-amylase activity, an essential enzyme of carbohydrate metabolism for many crop pests, in A. grandis midgut. Two α-amylase cDNAs from A. grandis larvae were isolated using RT-PCR followed by 5′ and 3′ RACE techniques. These encode proteins with predicted molecular masses of 50.8 and 52.7 kDa, respectively, which share 58% amino acid identity. Expression of both genes is induced upon feeding and concentrated in the midgut of adult insects. Several α-amylase inhibitors from plants were assayed against A. grandis α-amylases but, unexpectedly, only the BIII inhibitor from rye kernels proved highly effective, with inhibitors generally active against other insect amylases lacking effect. Structural modeling of Amylag1 and Amylag2 showed that different factors seem to be responsible for the lack of effect of 0.19 and α-AI1 inhibitors on A. grandis α-amylase activity. This work suggests that genetic engineering of cotton to express α-amylase inhibitors may offer a novel route to A. grandis resistance.

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Authors and Affiliations

  1. Embrapa Recursos Genéticos e Biotecnologia, Brasilia-DF, Brazil

    Osmundo B. Oliveira-Neto, João A. N. Batista, Daniel J. Rigden, Octávio L. Franco, Rosana Falcão, Rodrigo R. Fragoso, Luciane V. Mello, Roseane C. dos Santos & Maria F. Grossi-de-Sá

  2. Depto. de Biologia Celular, Universidade de Brasília, Brasília-DF, Brazil

    Osmundo B. Oliveira-Neto & Rodrigo R. Fragoso

  3. Pós-Graduação em Ciências Genômicas e Biotecnologia, Universidade Católica de Brasília, Brasília-DF, Brazil

    Octávio L. Franco & Roseane C. dos Santos

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  1. Osmundo B. Oliveira-Neto
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  2. João A. N. Batista
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  3. Daniel J. Rigden
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  4. Octávio L. Franco
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  5. Rosana Falcão
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  9. Maria F. Grossi-de-Sá
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Correspondence to Maria F. Grossi-de-Sá.

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Oliveira-Neto, O.B., Batista, J.A.N., Rigden, D.J. et al. Molecular Cloning of α-Amylases from Cotton Boll Weevil, Anthonomus grandis and Structural Relations to Plant Inhibitors: An Approach to Insect Resistance. J Protein Chem 22, 77–87 (2003). https://doi.org/10.1023/A:1023024012657

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