Isolation and characterization of a hepcidin peptide from the head kidney of large yellow croaker, Pseudosciaena crocea.
Large yellow croaker (Pseudosciaena crocea) is one of the most important marine cultured fish in China. Acidic extracts of five tissues of large yellow croaker showed strong anti-Vibrio alginolyticus activity. Acidic extract of head kidney tissue was subjected to heat-treatment in boiling water, and solid-phase extraction on Sep-Pak C(18) cartridge. It was found that the antibacterial substances were heat stable, and 20% acetonitrile effluent exhibited strong antibacterial activity. Active extract was further applied to Sephadex G-25 gel permeation chromatography and StableBond C(18) RP-HPLC. An antibacterial peptide with a single peak was obtained. The results of amino acid sequencing and MALDI-TOF MS suggested that the peptide was RCRFCCRCCPRMRGCGICCRF with an observed molecular mass of 2523.2 Da. BLAST searching suggested that the purified antibacterial peptide was the mature peptide section of the hepcidin preproprotein presumed from cDNA of large yellow croaker, thus designated hepcidin-Pl. Hepcidin-P1 exhibited strong antibacterial activity against four marine vibrios.
Key Laboratory of Science and Technology for Aquaculture and Food Safety, Fisheries College, Jimei University, Xiamen, Fujiang 361021, PR China.
Junjie
J
Zhang
Qingpi
Q
Yan
Rongxing
R
Ji
Wenzheng
W
Zou
Guojun
G
Guo
D000595:Amino Acid Sequence; D000818:Animals; D000900:Anti-Bacterial Agents / Q000276:immunology / Q000302:isolation & purification* / Q000494:pharmacology; D023181:Antimicrobial Cationic Peptides / Q000276:immunology / Q000302:isolation & purification* / Q000494:pharmacology; D002850:Chromatography, Gel / Q000662:veterinary; D002851:Chromatography, High Pressure Liquid / Q000662:veterinary; D064451:Hepcidins; D008826:Microbial Sensitivity Tests / Q000662:veterinary; D008969:Molecular Sequence Data; D010473:Perciformes / Q000276:immunology*; D010802:Phylogeny; D016415:Sequence Alignment; D052616:Solid Phase Extraction / Q000662:veterinary; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000662:veterinary
D000900:Anti-Bacterial Agents; D023181:Antimicrobial Cationic Peptides; D064451:Hepcidins