Phelan, P. and Goulding, L.A. and Tam, J.L.Y. and Allen, M.J. and Dawber, R.J. and Davies, J.A. and Bacon, J.P. (2008) Molecular mechanism of rectification at identified electrical synapses in the Drosophila Giant Fiber System. Current Biology, 18 (24). pp. 1955-1960. ISSN 0960-9822.
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Electrical synapses are neuronal gap junctions that mediate fast transmission in many neural circuits [1-5]. The structural proteins of gap junctions are the products of two multigene families. Connexins are unique to chordates ; innexins/pannexins encode gap-junction proteins in prechordates and chordates [6-10]. A concentric array of six protein subunits constitutes a hemichannel; electrical synapses result from the docking of hemichannels in pre- and postsynaptic neurons. Some electrical synapses are bidirectional; others are rectifying junctions that preferentially transmit depolarizing current anterogradely [11, 12]. The phenomenon of rectification was first described five decades ago , but the molecular mechanism has not been elucidated. Here, we demonstrate that putative rectifying electrical synapses in the Drosophila Giant Fiber System  are assembled from two products of the innexin gene shaking-B. Shaking-B(Neural+16)  is required presynaptically in the Giant Fiber to couple this cell to its postsynaptic targets that express Shaking-B(Lethal) . When expressed in vitro in neighboring cells, Shaking-B(Neural+16) and Shaking-B(Lethal) form heterotypic channels that are asymmetrically gated by voltage and exhibit classical rectification. These data provide the most definitive evidence to date that rectification is achieved by differential regulation of the pre- and postsynaptic elements of structurally asymmetric junctions.
|Divisions:||Faculties > Science Technology and Medical Studies > School of Biosciences|
|Depositing User:||Pauline Phelan|
|Date Deposited:||09 Apr 1914 15:18|
|Last Modified:||11 Jun 2012 15:10|
|Resource URI:||http://kar.kent.ac.uk/id/eprint/18450 (The current URI for this page, for reference purposes)|
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