title: Purification and cloning of a novel antimicrobial peptide from salivary glands of the hard tick, Ixodes sinensis.
abstract: A novel antimicrobial peptide named as ixosin-B was isolated from the salivary glands of the hard tick, Ixodes sinensis, by gel filtration, ion exchange chromatography and reverse-phase high-performance liquid chromatography (RP-HPLC). Its amino acid sequence was determined as QLKVDLWGTRSGIQPEQHSSGKSDVRRWRSRY by Edman degradation. The cDNA encoding ixosin-B was cloned by cDNA library screening. The predicted protein from the cDNA sequence composed of 89 amino acids including mature ixosin-B. Purified ixosin-B exerted its antimicrobial activities against bacteria and fungi. No similarity was found by BLAST search to any database entries and, thus, our findings describe a novel antimicrobial peptide. It is also the fourth family of antimicrobial peptide from hard ticks.
authors.affiliation: College of Life Sciences, Shenzhen University, Shenzhen 518060, Guangdong, China. lzg@szu.edu.cn
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Liu
authors.forename: Huan
authors.initials: H
authors.lastname: Liu
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Liu
authors.forename: Xuli
authors.initials: X
authors.lastname: Wu
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000890:Anti-Infective Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D002176:Candida albicans / Q000187:drug effects; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000235:genetics; D004912:Erythrocytes / Q000187:drug effects; D004926:Escherichia coli / Q000187:drug effects; D005260:Female; D006461:Hemolysis / Q000187:drug effects; D008297:Male; D008826:Microbial Sensitivity Tests; D008969:Molecular Sequence Data; D010455:Peptides / Q000737:chemistry / Q000235:genetics* / Q000302:isolation & purification* / Q000494:pharmacology; D011817:Rabbits; D012469:Salivary Glands / Q000737:chemistry* / Q000378:metabolism; D013211:Staphylococcus aureus / Q000187:drug effects; D013987:Ticks / Q000235:genetics*
chemical_list: D000890:Anti-Infective Agents; D018076:DNA, Complementary; D010455:Peptides