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Expression of genes encoding antimicrobial and bradykinin-related peptides in skin of the stream brown frog Rana sakuraii

Abstract : Peptidomic analysis of an extract of the skin of the stream brown frog Rana sakuraii Matsui and Matsui, 1990 led to the isolation of a C-terminally alpha-amidated peptide (VR-23; VIGSILGALASGLPTLISWIKNR x NH2) with broad-spectrum antimicrobial activity that shows structural similarity to the bee venom peptide, melittin together with two peptides belonging to the temporin family (temporin-1SKa; FLPVILPVIGKLLNGIL x NH2 and temporin-1SKb; FLPVILPVIGKLLSGIL x NH2), and peptides whose primary structures identified them as belonging to the brevinin-2 (2 peptides) and ranatuerin-2 (1 peptide) families. Using a forward primer that was designed from a conserved region of the 5'-untranslated regions of Rana temporaria preprotemporins in a 3'-RACE procedure, a cDNA clone encoding preprotemporin-1SKa was prepared from R. sakuraii skin total RNA. Further preprotemporin cDNAs encoding temporin-1SKc (AVDLAKIANIAN KVLSSL F x NH2) and temporin-1SKd (FLPMLAKLLSGFL x NH2) were obtained by RT-PCR. Unexpectedly, the 3'-RACE procedure using the same primer led to amplification of a cDNA encoding a preprobradykinin whose signal peptide region was identical to that of preprotemporin-1SKa except for the substitution Ser18-->Asn. R. sakuraii bradykinin ([Arg0,Leu1,Thr6,Trp8] BK) was 28-fold less potent than mammalian BK in effecting B2 receptor-mediated relaxation of mouse trachea and the des[Arg0] derivative was only a weak partial agonist. The evolutionary history of the Japanese brown frogs is incompletely understood but a comparison of the primary structures of the R. sakuraii dermal peptides with those of Tago's brown frog Rana tagoi provides evidence for a close phylogenetic relationship between these species.
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https://hal-normandie-univ.archives-ouvertes.fr/hal-01974208
Contributor : Jérôme Leprince <>
Submitted on : Tuesday, January 8, 2019 - 4:21:38 PM
Last modification on : Wednesday, December 4, 2019 - 11:18:01 AM

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Hiroe Suzuki, Shawichi Iwamuro, Aya Ohnuma, Laurent Coquet, Jérôme Leprince, et al.. Expression of genes encoding antimicrobial and bradykinin-related peptides in skin of the stream brown frog Rana sakuraii. Peptides, Elsevier, 2007, 28 (3), pp.505-514. ⟨10.1016/j.peptides.2006.10.016⟩. ⟨hal-01974208⟩

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