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Genomic organization and deduced amino acid sequence of a putative sodium channel gene in Drosophila
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Genomic organization and deduced amino acid sequence of a putative sodium channel gene in Drosophila
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Genomic organization and deduced amino acid sequence of a putative sodium channel gene in Drosophila
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Journal Article
Genomic organization and deduced amino acid sequence of a putative sodium channel gene in Drosophila
1987
Overview
The deduced amino acid sequence of a Drosophila gene isolated with a vertebrate sodium channel complementary DNA probe revealed an organization virtually identical to the vertebrate sodium channel protein; four homologous domains containing all putative membrane-spanning regions are repeated in tandem with connecting linkers of various sizes. All areas of the protein presumed to be critical for channel function show high evolutionary conservation. These include those proposed to function in voltage-sensitive gating, inactivation, and ion selectivity. All 24 putative gating charges of the vertebrate protein are in identical positions in the Drosophila gene. Ten introns interrupt the coding regions of the four homology units; introns with positions conserved among homology units bracket a region hypothesized to be the selectivity filter for the channel. The Drosophila gene maps to the right arm of the second chromosome in region 60D-E. This position does not coincide with any known mutations that confer behavioral phenotypes, but is close to the seizure locus (60A-B), which has been hypothesized to code for a voltage-sensitive sodium channel.
Publisher
The American Association for the Advancement of Science,American Association for the Advancement of Science
Subject
/ Analysis
/ Animals
/ Biological and medical sciences
/ DNA
/ Drosophila melanogaster - genetics
/ Eels
/ Exons
/ Fundamental and applied biological sciences. Psychology
/ GENE
/ GENES
/ Genetics
/ GENOMAS
/ GENOME
/ GENOMES
/ Genomics
/ Introns
/ Membrane Proteins - genetics
/ Molecular and cellular biology
/ Proteins
/ Sequence Homology, Nucleic Acid
/ SODIO
/ SODIUM
