title: Antimicrobial peptides derived from goose egg white lysozyme.
abstract: Peptide fragments possessing antimicrobial activity were obtained by protease digestion of goose egg white lysozyme. Digested peptide purified from RP-HPLC which showed no lysozyme activity exhibited bactericidal activity toward Gram-negative and Gram-positive bacteria. LC/MS-MS and automated Edman degradation revealed the amino acid sequence to be Thr-Ala-Lys-Pro-Glu-Gly-Leu-Ser-Tyr. This sequence corresponds to amino acid positions 20-28, located at the N-terminal outer part of goose lysozyme. The peptide acted on bacterial membrane as shown by scanning electron microscopy. The mechanism of action could be explained from a helical structure that may be formed by the centered Pro residue and the terminal Lys residue after the peptide attaches to a cell membrane. This is the first study to report that a peptide derived from the protease digests of G-type lysozyme possesses antimicrobial activity with broad spectrum activity. Our result is comparative to the previous reports of Chicken lysozyme and T4 phage lysozyme, which showed antimicrobial activity after digestion with protease. These results might contribute to the usage of antimicrobial peptides engineered by genetic or chemical synthesis.
authors.affiliation: Department of Biochemistry, Faculty of Science, Khon Kaen University, Khon Kaen, Thailand.
authors.forename: Sompong
authors.initials: S
authors.lastname: Thammasirirak
authors.forename: Yuwatida
authors.initials: Y
authors.lastname: Pukcothanung
authors.forename: Sutthidech
authors.initials: S
authors.lastname: Preecharram
authors.forename: Sakda
authors.initials: S
authors.lastname: Daduang
authors.forename: Rina
authors.initials: R
authors.lastname: Patramanon
authors.forename: Tamo
authors.initials: T
authors.lastname: Fukamizo
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Araki
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000890:Anti-Infective Agents / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects* / Q000254:growth & development / Q000648:ultrastructure; D002462:Cell Membrane / Q000187:drug effects / Q000648:ultrastructure; D002851:Chromatography, High Pressure Liquid; D056148:Chromatography, Reverse-Phase; D004527:Egg Proteins / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism / Q000494:pharmacology*; D005777:Geese / Q000378:metabolism*; D006868:Hydrolysis; D008855:Microscopy, Electron, Scanning; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009113:Muramidase / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism / Q000494:pharmacology*; D010446:Peptide Fragments / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism / Q000494:pharmacology*; D017433:Protein Structure, Secondary; D017434:Protein Structure, Tertiary; D053719:Tandem Mass Spectrometry
chemical_list: D000890:Anti-Infective Agents; D004527:Egg Proteins; D010446:Peptide Fragments; D009113:Muramidase