Artigo Acesso aberto Revisado por pares

Screening and cDNA Cloning of Kv1 Potassium Channel Toxins in Sea Anemones

2010; Multidisciplinary Digital Publishing Institute; Volume: 8; Issue: 12 Linguagem: Inglês

10.3390/md8122893

ISSN

1660-3397

Autores

Yoshikazu Yamaguchi, Yuichi Hasegawa, Tomohiro Honma, Yuji Nagashima, Kazuo Shiomi,

Tópico(s)

Marine Toxins and Detection Methods

Resumo

When 21 species of sea anemones were screened for Kv1 potassium channel toxins by competitive inhibition of the binding of 125I-α-dendrotoxin to rat synaptosomal membranes, 11 species (two species of Actiniidae, one species of Hormathiidae, five species of Stichodactylidae and three species of Thalassianthidae) were found to be positive. Furthermore, full-length cDNAs encoding type 1 potassium channel toxins from three species of Stichodactylidae and three species of Thalassianthidae were cloned by a combination of RT-PCR, 3′RACE and 5′RACE. The precursors of these six toxins are commonly composed of signal peptide, propart and mature peptide portions. As for the mature peptide (35 amino acid residues), the six toxins share more than 90% sequence identities with one another and with κ1.3-SHTX-She1a (Shk) from Stichodactyla helianthus but only 34–63% identities with the other type 1 potassium channel toxins.

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