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Plant Cell

Title:		A plasma membrane protein from Zea mays binds with the herbivore elicitor volicitin
Author(s):		Truitt CL; Wei HX; Pare PW;
Address:		"Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409, USA"
Journal Title:		Plant Cell
Year:		2004
Volume:		20040116
Issue:		2
Page Number:		523 - 532
DOI:		10.1105/tpc.017723
ISSN/ISBN:		1040-4651 (Print) 1532-298X (Electronic) 1040-4651 (Linking)
Abstract:		"Volicitin (17-hydroxylinolenoyl-l-Gln) present in the regurgitant of Spodoptera exigua (beet armyworm caterpillars) activates the emission of volatile organic compounds (VOCs) when in contact with damaged Zea mays cv Delprim (maize) leaves. VOC emissions in turn serve as a signaling defense for the plant by attracting female parasitic wasps that prey on herbivore larvae. A tritiated form of volicitin was synthesized and shown to induce volatiles in the same fashion as the biological form. [(3)H]-l-volicitin rapidly, reversibly, and saturably bound to enriched plasma membrane fractions isolated from Z. mays leaves with an apparent K(d) of 1.3 nM and a Hill coefficient of 1.07. Analog studies showed that the l-Gln and hydroxy moieties of volicitin play an important role in binding. Treatment of plants with methyl jasmonate (MeJA) increased the total binding of [(3)H]-l-volicitin to the enriched plasma membrane more than threefold, suggesting that MeJA activates transcription of the gene encoding the binding protein. S. exigua feeding also increased total binding fourfold. Cycloheximide pretreatment of plants significantly decreased binding of radiolabeled volicitin to the enriched plasma membrane. These data provide the first experimental evidence that initiation of plant defenses in response to herbivore damage can be mediated by a binding protein-ligand interaction"
Keywords:		"Acetates/pharmacology Animals Binding Sites/genetics Cyclopentanes/pharmacology Glutamine/*analogs & derivatives/chemistry/*metabolism/pharmacology Immunity, Innate/drug effects/genetics/physiology Insect Control/methods Membrane Proteins/genetics/*metabo;"
Notes:		"MedlineTruitt, Christopher L Wei, Han-Xun Pare, Paul W eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. England 2004/01/20 Plant Cell. 2004 Feb; 16(2):523-32. doi: 10.1105/tpc.017723. Epub 2004 Jan 16"