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M94A0286.TXT
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1994-10-08
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Document 0286
DOCN M94A0286
TI Expression of active, processed ricin in transgenic tobacco.
DT 9412
AU Sehnke PC; Pedrosa L; Paul AL; Frankel AE; Ferl RJ; Department of
Horticultural Sciences, University of Florida,; Gainesville 32611.
SO J Biol Chem. 1994 Sep 9;269(36):22473-6. Unique Identifier : AIDSLINE
MED/94357881
AB The cDNA encoding the plant toxin precursor preproricin was introduced
into tobacco via Agrobacterium tumefaciens-mediated gene transfer.
Transgenic plants were assayed for type II ribosome-inactivating protein
expression and activity. Western blot analysis of soluble leaf extracts
using anti-ricin a-chain (RTA) antibodies identified 34- and 32-kDa
proteins, which were electrophoretically indistinguishable from castor
seed RTA. Analysis with anti-ricin b-chain (RTB) antibodies identified
both a 34-kDa protein major band, which co-migrated with castor seed
RTB, and a 30-kDa protein minor band. Enzyme-linked immunoassay of the
transgenic leaf extracts with anti-RTA and anti-RTB indicated microgram
per gram production on a fresh weight basis of soluble extractable
recombinant ricin. Sugar binding enzyme-linked immunoassay employing an
immobilized glycoprotein, asialofetuin, and anti-RTB antibodies
confirmed the characteristic type II ribosome-inactivating protein
galactose binding lectin activity of the recombinant ricin. The
enzymatic activity of recombinant ricin was characterized for cell-free
translation inhibition, as well as for overall cytotoxicity. A 50%
inhibitory dose of 3 x 10(-11) M was observed for the immunoreactive
leaf extract material using a rabbit reticulocyte translation inhibition
assay, while a 50% lethal dose of 1 x 10(-12) M was calculated with
human T-lymphotropic virus-1 infected leukemic T-cells.
DE Agrobacterium tumefaciens Animal Base Sequence Castor
Bean/GENETICS/METABOLISM Cell Line Cell Survival/DRUG EFFECTS DNA
Primers DNA, Complementary/METABOLISM Electrophoresis, Polyacrylamide
Gel Enzyme-Linked Immunosorbent Assay *Gene Transfer Human
HTLV-I/DRUG EFFECTS/PHYSIOLOGY Molecular Sequence Data *Plants,
Transgenic Plasmids Polymerase Chain Reaction Protein
Precursors/*BIOSYNTHESIS/ISOLATION & PURIF/TOXICITY Rabbits
Recombinant Proteins/BIOSYNTHESIS/ISOLATION & PURIF Reticulocytes/DRUG
EFFECTS Ricin/*BIOSYNTHESIS/ISOLATION & PURIF/TOXICITY Support, U.S.
Gov't, P.H.S. Tobacco/*METABOLISM Translation, Genetic/DRUG EFFECTS
JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).