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Pheromone reception in fruit flies expressing a moth's odorant receptor.

Abstract：

:We have expressed a male-specific, pheromone-sensitive odorant receptor (OR), BmorOR1, from the silkworm moth Bombyx mori in an "empty neuron" housed in the ab3 sensilla of a Drosophila Deltahalo mutant. Single-sensillum recordings showed that the BmorOR1-expressing neurons in the transgenic flies responded to the B. mori pheromone bombykol, albeit with low sensitivity. These transgenic flies responded to lower doses of bombykol in an altered stimulation method with direct delivery of pheromone into the sensillum milieu. We also expressed a B. mori pheromone-binding protein, BmorPBP, in the BmorOR1-expressing ab3 sensilla. Despite the low levels of BmorPBP expression, flies carrying both BmorOR1 and BmorPBP showed significantly higher electrophysiological responses than BmorOR1 flies. Both types of BmorOR1-expressing flies responded to bombykol, and to a lesser extent to a second compound, bombykal, even without the addition of organic solvents to the recording electrode buffer. When the semiochemicals were delivered by the conventional puffing of stimulus on the antennae, the receptor responded to bombykol but not to bombykal. The onset of response was remarkably slow, and neural activity extended for an unusually long time (>1 min) after the end of stimulus delivery. We hypothesize that BmorOR1-expressing ab3 sensilla lack a pheromone-degrading enzyme to rapidly inactivate bombykol and terminate the signal. We also found an endogenous receptor in one of the sensillum types on Drosophila antenna that responds to bombykol and bombykal with sensitivity comparable to the pheromone-detecting sensilla on B. mori male antennae.

journal_name

Proc Natl Acad Sci U S A

journal_title

Proceedings of the National Academy of Sciences of the United States of America

authors

Syed Z,Ishida Y,Taylor K,Kimbrell DA,Leal WS

doi

10.1073/pnas.0607874103

subject

Has Abstract

pub_date

2006-10-31 00:00:00

pages

16538-43

issue

44

eissn

0027-8424

issn

1091-6490

pii

0607874103

journal_volume

103

pub_type

杂志文章

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