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Chemical Senses 2: 51-61,
© 1976

research-article

LOCALIZATION AND REACTIONS OF A PHEROMONE DEGRADATIVE ENZYME ISOLATED FROM AN INSECT ANTENNA*

M. S. MAYER, S. M. FERKOVICH and R. R. RUTTER

Insect Attractants, Behavior and Basic Biology Research Laboratory, Agr. Res. Serv., USDA, Gainesville, Fla. 32604, U.S.A.

A fluid isolated from chemosensory sensilla on the antennae of males and females of the cabbage looper, Trichoplusia ni (Hübner), was fractionated by gel filtration. Enzymatic degradation of the pheromone was associated with 2 distinct groups of fractions. The first group contained membrane fragments, vesicles, and membrane-bound enzyme or insoluble enzyme aggregates. The second group of fractions contained solublilized enzyme. Because of the method of isolating the ‘sensillum liquor’ by breaking the tips of the hairs, membranes from chemoreceptor cell dendrites should greatly predominate. In general, 3 isomers and the saturated analog of the pheromone were hydrolyzed more rapidly than the pheromone.

*Mention of a proprietary product in this paper does not constitute an endorsement of this product by the U. S. Department of Agriculture.


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