Identification and molecular characterization of novel cry1-type toxin genes from Bacillus thuringiensis K1 isolated in Korea.
To clone novel cry1-type genes from the Bacillus thuringiensis K1 isolate, about 2.4-kb-long PCR fragments were amplified with two primer sets of ATG1-F/N400-R and 1BeATG1-F/N400-R. Using PCR-RFLP, three novel cry1-type genes, cry1-1, cry1-7, and cry1-44, were obtained from B. thuringiensis K1 and the complete coding sequences of these novel genes were analyzed. The Cry1-1, Cry1-7, and Cry1-44 proteins showed maximum similarities of about 78.0%, 99.7%, and 91.0% with the Cry1Ha1, Cry1Be1, and Cry1Ac2 proteins, respectively. These novel cry1-type genes were expressed using a baculovirus expression vector system and their insecticidal activities were investigated. Whereas all three novel genes were toxic to Plutella xylostella larvae, only Cry1-1 showed insecticidal activity against Spodoptera exigua larvae.
State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Lion Street, Hongshan District, Wuhan 430070, China.
Ming Shun
MS
Li
Jae Young
JY
Choi
Jong Yul
JY
Roh
Hee Jin
HJ
Shim
Joong Nam
JN
Kang
Yang-Su
YS
Kim
Yong
Y
Wang
Zi Niu
ZN
Yu
Byung Rae
BR
Jin
Yeon Ho
YH
Je
D000818:Animals; D001413:Bacillus thuringiensis / Q000235:genetics* / Q000302:isolation & purification; D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins / Q000235:genetics* / Q000494:pharmacology; D001427:Bacterial Toxins / Q000235:genetics* / Q000494:pharmacology; D001483:Base Sequence; D001681:Biological Assay; D017931:DNA Primers / Q000235:genetics; D004269:DNA, Bacterial / Q000235:genetics; D004731:Endotoxins / Q000235:genetics* / Q000494:pharmacology; D005798:Genes, Bacterial; D006460:Hemolysin Proteins / Q000235:genetics* / Q000494:pharmacology; D007313:Insecta / Q000187:drug effects; D007723:Korea; D016133:Polymerase Chain Reaction; D011994:Recombinant Proteins / Q000235:genetics / Q000494:pharmacology
D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins; D001427:Bacterial Toxins; D017931:DNA Primers; D004269:DNA, Bacterial; D004731:Endotoxins; D006460:Hemolysin Proteins; D011994:Recombinant Proteins; C030956:insecticidal crystal protein, Bacillus Thuringiensis