title: Aurelin, a novel antimicrobial peptide from jellyfish Aurelia aurita with structural features of defensins and channel-blocking toxins.
abstract: A novel 40-residue antimicrobial peptide, aurelin, exhibiting activity against Gram-positive and Gram-negative bacteria, was purified from the mesoglea of a scyphoid jellyfish Aurelia aurita by preparative gel electrophoresis and RP-HPLC. Molecular mass (4296.95 Da) and complete amino acid sequence of aurelin (AACSDRAHGHICESFKSFCKDSGRNGVKLRANCKKTCGLC) were determined. Aurelin has six cysteines forming three disulfide bonds. The total RNA was isolated from the jellyfish mesoglea, RT-PCR and cloning were performed, and cDNA was sequenced. A 84-residue preproaurelin contains a putative signal peptide (22 amino acids) and a propiece of the same size (22 amino acids). Aurelin has no structural homology with any previously identified antimicrobial peptides but reveals partial similarity both with defensins and K+ channel-blocking toxins of sea anemones and belongs to ShKT domain family.
authors.affiliation: Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Miklukho-Maklaya str. 16/10, 117997 Moscow, Russia. ovch@ibch.ru
authors.forename: Tatiana V
authors.initials: TV
authors.lastname: Ovchinnikova
authors.forename: Sergey V
authors.initials: SV
authors.lastname: Balandin
authors.forename: Galina M
authors.initials: GM
authors.lastname: Aleshina
authors.forename: Andrey A
authors.initials: AA
authors.lastname: Tagaev
authors.forename: Yulia F
authors.initials: YF
authors.lastname: Leonova
authors.forename: Eugeny D
authors.initials: ED
authors.lastname: Krasnodembsky
authors.forename: Alexander V
authors.initials: AV
authors.lastname: Men'shenin
authors.forename: Vladimir N
authors.initials: VN
authors.lastname: Kokryakov
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000890:Anti-Infective Agents / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D023181:Antimicrobial Cationic Peptides / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D001483:Base Sequence; D003001:Cloning, Molecular; D023082:Defensins / Q000737:chemistry; D004926:Escherichia coli / Q000187:drug effects; D008089:Listeria monocytogenes / Q000187:drug effects; D008387:Marine Toxins / Q000737:chemistry; D008969:Molecular Sequence Data; D037401:Scyphozoa / Q000737:chemistry
chemical_list: D000890:Anti-Infective Agents; D023181:Antimicrobial Cationic Peptides; D023082:Defensins; D008387:Marine Toxins