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Facilitation of Calmodulin-Mediated Odor Adaptation by cAMP-Gated Channel Subunits

Science  07 Dec 2001:
Vol. 294, Issue 5549, pp. 2176-2178
DOI: 10.1126/science.1063415

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Abstract

Calcium (Ca2+) influx through Ca2+-permeable ion channels plays a pivotal role in a variety of neuronal signaling processes, and negative-feedback control of this influx by Ca2+ itself is often equally important for modulation of such signaling. Negative modulation by Ca2+ through calmodulin (CaM) on cyclic nucleotide–gated (CNG) channels underlies the adaptation of olfactory receptor neurons to odorants. We show that this feedback requires two additional subunits of the native olfactory channel, CNGA4 and CNGB1b, even though the machinery for CaM binding and modulation is present in the principal subunit CNGA2. This provides a rationale for the presence of three distinct subunits in the native olfactory channel and underscores the subtle link between the molecular make-up of an ion channel and the physiological function it subserves.

  • * Present address: Howard Hughes Medical Institute, Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.

  • Present address: Sophion Bioscience, Pederstrupvej 93, 2750 Ballerup, Denmark.

  • To whom correspondence should be addressed. E-mail: s.frings{at}fz-juelich.de

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