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Related Experiment Videos

Primary structure of common carp prolactins.

A Yasuda, K Miyazima, H Kawauchi

    General and Comparative Endocrinology
    |May 1, 1987
    PubMed
    Summary

    Researchers determined the amino acid sequence of common carp prolactin (PRL), revealing its structure and evolutionary relationships. This fish PRL shares conserved regions with salmon and mammalian PRLs but has unique variations.

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    Divergence and polymorphism analysis of IGF1Ra and IGF1Rb from orange-spotted grouper, Epinephelus coioides (Hamilton).

    Genetics and molecular research : GMR·2016

    Area of Science:

    • Comparative genomics
    • Endocrinology
    • Protein chemistry

    Background:

    • Prolactin (PRL) is a crucial hormone regulating reproduction and osmoregulation.
    • Understanding fish PRL structure provides insights into vertebrate hormone evolution.

    Purpose of the Study:

    • To determine the complete amino acid sequence of common carp (Cyprinus carpio) prolactin (PRL).
    • To compare carp PRL sequence with other vertebrate PRLs for evolutionary insights.

    Main Methods:

    • Protein reduction and carboxymethylation.
    • Enzymatic and chemical cleavage (cyanogen bromide, lysyl endopeptidase).
    • Peptide separation via reverse-phase HPLC and sequence analysis (Edman degradation).

    Main Results:

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    • The carp PRL sequence comprises 186 amino acid residues with two disulfide linkages.
    • Carp PRL shows 77% sequence identity to salmon PRL and 36% to mammalian PRLs.
    • Conserved segments were identified, with variations clustered in specific regions.

    Conclusions:

    • Carp PRL structure is evolutionarily conserved in key regions compared to salmon and mammalian PRLs.
    • The unique sequence features of carp PRL contribute to understanding PRL functional diversity.