title: Purification of a novel antibacterial short peptide in earthworm Eisenia foetida.
abstract: A novel antimicrobial short peptide was purified from earthworm (Eisenia foetida) by a five-step protocol including ammonium sulfate precipitation, ultrafiltration, DE-52 ion exchange chromatography, Sephadex G-10 column chromatography, and C-18 reversed-phase HPLC techniques. The purified peptide was applied to the MALDI-TOP MS to determine the molecular mass and was also subjected to TOF MS-MS analysis to determine the amino acid sequence. As a result, a novel antibacterial peptide, named OEP3121, was obtained, with the molecular mass of 510.8 Da and the sequence being "ACSAG".
authors.affiliation: College of Resource and Environment Science, China Agricultural University, Beijing.
authors.forename: Yan-Qin
authors.initials: YQ
authors.lastname: Liu
authors.forename: Zhen-Jun
authors.initials: ZJ
authors.lastname: Sun
authors.forename: Chong
authors.initials: C
authors.lastname: Wang
authors.forename: Shi-Jie
authors.initials: SJ
authors.lastname: Li
authors.forename: Yu-Zhi
authors.initials: YZ
authors.lastname: Liu
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D002852:Chromatography, Ion Exchange; D004926:Escherichia coli / Q000187:drug effects; D008826:Microbial Sensitivity Tests; D008969:Molecular Sequence Data; D008970:Molecular Weight; D009835:Oligochaeta / Q000737:chemistry*; D010455:Peptides / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D011550:Pseudomonas aeruginosa / Q000187:drug effects; D017386:Sequence Homology, Amino Acid; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013211:Staphylococcus aureus / Q000187:drug effects
chemical_list: D000900:Anti-Bacterial Agents; D010455:Peptides