Vip3A is a group of vegetative insecticidal proteins (i.e.,
produced during the vegetative stage of bacterial growth) from
Bacillus thuringiensis, a gram-positive bacterium commonly
found in soil. The Vip3A proteins are highly toxic to some
lepidopteran insects.
Vip3Aa20 is a mutated form of the vip3Aa19 gene from the Bacillus
thuringiensis strain AB88. The mutation occurred by two codon
changes within the vip3Aa19 coding sequence when this gene was
introduced in the maize event MIR162. One of these was a silent
mutation and the other codon change resulted in an amino acid
substitution. Therefore, the vip3Aa gene variant present in MIR162
maize has been designated vip3Aa20.
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