Discovery and characterization of Sip1A: A novel secreted protein from Bacillus thuringiensis with activity against coleopteran larvae.
Bioassay screening of Bacillus thuringiensis culture supernatants identified strain EG2158 as having larvicidal activity against Colorado potato beetle (Leptinotarsa decemlineata) larvae. Ion-exchange fractionation of the EG2158 culture supernatant resulted in the identification of a protein designated Sip1A (secreted insecticidal protein) of approximately 38 kDa having activity against Colorado potato beetle (CPB). An oligonucleotide probe based on the N-terminal sequence of the purified Sip1A protein was used to isolate the sip1A gene. The sequence of the Sip1A protein, as deduced from the sequence of the cloned sip1A gene, contained 367 residues (41,492 Da). Recombinant B. thuringiensis and Escherichia coli harboring cloned sip1A produced Sip1A protein which had insecticidal activity against larvae of CPB, southern corn rootworm (Diabrotica undecimpunctata howardi), and western corn rootworm (Diabrotica virgifera virgifera).
Monsanto Company, St. Louis, MO, USA. william.p.donovan@monsanto.com
William P
WP
Donovan
James T
JT
Engleman
Judith C
JC
Donovan
James A
JA
Baum
Greg J
GJ
Bunkers
David J
DJ
Chi
William P
WP
Clinton
Leigh
L
English
Gregory R
GR
Heck
Oliver M
OM
Ilagan
Karina C
KC
Krasomil-Osterfeld
John W
JW
Pitkin
James K
JK
Roberts
Matthew R
MR
Walters
D000818:Animals; D001413:Bacillus thuringiensis / Q000737:chemistry*; D001426:Bacterial Proteins / Q000737:chemistry / Q000494:pharmacology; D001427:Bacterial Toxins / Q000494:pharmacology*; D001517:Coleoptera / Q000187:drug effects / Q000254:growth & development / Q000382:microbiology*; D007306:Insecticides / Q000494:pharmacology; D007814:Larva / Q000187:drug effects* / Q000382:microbiology; D010572:Pest Control, Biological
D001426:Bacterial Proteins; D001427:Bacterial Toxins; D007306:Insecticides