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Identification of angiotensin I in several vertebrate species: its structural and functional evolution

Takei, Yoshio, Joss, Jean M.P., Kloas, Werner and Rankin, J. Cliff (2004) Identification of angiotensin I in several vertebrate species: its structural and functional evolution. General and Comparative Endocrinology, 135 (3). pp. 286-292. ISSN 0016-6480

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    In order to delineate further the molecular evolution of the renin–angiotensin system in vertebrates, angiotensin I (ANG I) has been isolated after incubation of plasma and kidney extracts of emu (Dromiceus novaehollandiae), axolotl (Ambystoma mexicanum), and sea lamprey (Petromyzon marinus). The identified sequences were [Asp1, Val5, Asn9] ANG I in emu, [Asp1, Val5, His9] ANG I in axolotl, and [Asn1, Val5, Thr9] ANG I in sea lamprey. These results confirmed the previous findings that tetrapods have Asp and fishes including cyclostomes have Asn at the N-terminus, and that the amino acid residue at position 9 of ANG I was highly variable but, those at other positions were well conserved among different species. Since Asp and Asn are convertible during incubation, angiotensinogen sequences were searched in the genome and/or EST database to determine the N-terminal amino acid residue from the gene. The screening detected 12 tetrapod (10 mammalian, one avian, and one amphibian) and seven teleostean angiotensinogen sequences. Among them, all tetrapods have [Asp1] ANG except for Xenopus, and all teleosts have [Asn1] ANG, thereby confirming the above rule. Comparison of the vasopressor activity in the eel revealed that [Asn1] ANG I and II were more potent than [Asp1] peptides, which was opposite to the previous results in mammals and birds, in which [Asp1] ANG I and II were more potent. Collectively, the present results support the general rule that tetrapods have [Asp1] ANG and fishes including cyclostomes have [Asn1] ANG. However, an aquatic anuran (Xenopus) has [Asn1] ANG in its gene despite another aquatic urodele (axolotl) has [Asp1] ANG. From the functional viewpoint, homologous [Asn1] ANG was more potent in fish as is homologous [Asp1] ANG in tetrapods, suggesting that ANG II molecule has undergone co-evolution with its receptor during vertebrate phylogeny.

    Item Type: Article
    Additional Information: © 2003 Published by Elsevier Inc.
    Uncontrolled Keywords: Renin–angiotensin system; Emu, Dromiceus novaehollandiae; Axolotl, Ambystoma mexicanum; Sea lamprey, Petromyzon marinus; Molecular evolution; Vasopressor effect in eel
    Subjects: Q Science > Q Science (General)
    Q Science > QR Microbiology
    Schools: School of Applied Sciences

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    Depositing User: Sara Taylor
    Date Deposited: 20 Dec 2007
    Last Modified: 28 Jul 2010 19:20


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