Organization and Phylogenetic Analysis of κ-Bungarotoxin Genes from Bungarus Multicinctus (Taiwan Banded Krait) View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2002-06

AUTHORS

Long-sen Chang, Charling Chung, Jordge Lin, Enjong Hong

ABSTRACT

Two genomic DNAs were isolated from the liver of Bungarus multicinctus (Taiwan banded krait) encoded κ1-bungarotoxin and κ3-bungarotoxin precursors, respectively. They shared virtually identical overall organization with three exons separated by two introns and a high degree of nucleotide-sequence identity with α-neurotoxin genes, including similar intron insertions. This suggests that κ-neurotoxins and α-neurotoxins might have originated from a common ancestor. The consensus transcriptional factor binding sites within the promoter regions of these genes indicate that their transcriptions are, at least in part, regulated under the same mechanism. Comparative analyses on κ-bungarotoxin and α-neurotoxin genes revealed that the protein-coding regions of exons were much more diversified than introns except for the signal peptide domain. Phylogenetic analyses on the exon and intron regions of κ-bungarotoxin and α-neurotoxin genes showed that the evolution of exon regions were not in consensus with that of intron regions. The ratio of nonsynonymous to synonymous substitution is higher than 1, reflecting the occurrence of an adaptive selection during the evolution of κ-bungarotoxins. In contrast to a conserved size of the second intron, segmental insertions and/or deletions within the first intron accelerate the evolutionary divergence of κ- and α-neurotoxin genes. More... »

PAGES

213-221

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/a:1020139728292

DOI

http://dx.doi.org/10.1023/a:1020139728292

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1023375998

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/12403176


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