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  • 學位論文

枯草桿菌F29-3全基因體定序與表現型分析

Whole-Genome Sequencing and Phenotypic Analysis of Bacillus subtilis F29-3

指導教授 : 許鴻猷

摘要


枯草桿菌為生長於土壤表層的革蘭氏陽性桿菌,具有產生內胞子的能力,對人類不具致病性。枯草桿菌屬的細菌,由於具有產生抗生素的能力,因此常被應用於食品、醫藥、與植物病害的生物防治。枯草桿菌F29-3是絲核菌類真菌Rizoctonia solani拮抗菌株,篩選自台中市豐原區。若將此細菌培養於Difco Sporulation Medium培養基中,經隔夜培養其可產生內胞子,培養於nHA固態培養基上菌落邊緣平整。多種桿菌屬細菌會產生桿菌素(Bacilysin),它是由L-alanine與L-anticapsin這兩種胺基酸組成的抗生素,可以抑制酵母菌與金黃色葡萄球菌的生長,除桿菌素外枯草桿菌F29-3可產生豐原素(Fengycin),豐原素是由枯草桿菌F29-3所生產的脂胜肽抗生素,其結構包含由十個胺基酸所組成的環狀胜肽鏈及一長碳鏈之脂肪酸。豐原素的胜肽鏈是經由非核醣體胜肽合成酶 (Nonribosomal peptide synthetases; NRPS)合成,在自然界中,非核醣體胜肽合成酶系統參與多種抗生素的合成。為了更加了解枯草桿菌F29-3,我們以霰彈槍定序法進行枯草桿菌F29-3的全基因體定序,由定序結果我們發現枯草桿菌F29-3基因體長度為4,195,514 bp,其G+C%為44.53%,共包含4,536個ORFs、10個16S/23S/5S rRNA operons、87個 tRNA genes、3個 NRPS loci (surfactin, fengycin, bacilysin)、2個 PKS (polyketide synthase;聚酮合成酶) loci與10個prophage。除了基因體定序外,我們也將枯草桿菌F29-3培養於960種不同營養成份以測定其使用這些養份的生長情形。這些結果將有助於我們更加了解枯草桿菌F29-3,並可應用於不同領域。

參考文獻


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