黃金葡萄球菌這字眼,周不時亦會在新聞媒體聽得到。796Please respect copyright.PENANAEyiUMoga5g796Please respect copyright.PENANAXd3XParx1Y
796Please respect copyright.PENANAkmsoeRKiPx
它之所以被冠以黃金這稱號,是因為它能夠製造大量金黃色的葡萄球菌黃素 (Staphyloxanthin),以及微量黃色化合物4,4‘-Diaponeurosporene。796Please respect copyright.PENANAUJwIWgjmqu
796Please respect copyright.PENANAE6rH8VTEXp
(圖2)當細菌入侵腸道的時候,我們的腸道內壁細胞及前來救駕的免疫細胞會釋出微量雙氧水等的游離基(Reactive oxygen species),對細菌進行攻擊。796Please respect copyright.PENANAXpCMuj5e2i796Please respect copyright.PENANAZefIbUhOFI
796Please respect copyright.PENANAvV7DR5Sis8
但黃金葡萄球菌的金黃色葡萄球菌黃素及另外那種黃色化學物正是能夠中和游離基攻擊的色素,因此免疫系統所產生的游離基攻擊對它傷害不大。796Please respect copyright.PENANA6J5483hwOd
796Please respect copyright.PENANAlFqWWqiOgq
然而,如果刪去製作色素的蛋白酶,「黃金」葡萄球菌失去抵擋游離基的手段,對宿主的感染力亦因而大大減低。796Please respect copyright.PENANAgsdrPZBc7M
796Please respect copyright.PENANAeo5QjI2NFb
(圖3)同時間,若將負責製造黃色色素的蛋白酶從黃金葡萄球菌轉移到另一款葡萄球菌,獲得了色素製作能力的它在老鼠身上所造成的感染傷害亦更之為強,引證色素對於細菌感染力的重要性。796Please respect copyright.PENANAdkjEKiVeV7796Please respect copyright.PENANADYJ9dHCW2T
796Please respect copyright.PENANAbtOPhQYUfz
(圖4)再舉另外一道例子,Cryptococcus neoformans是一種真菌(fungus),796Please respect copyright.PENANA6lk8l97KnN
它能夠製作黑色素(Melanin),亦即是上集所談及決定髮膚眼色的色素。796Please respect copyright.PENANATJb6wUiQMh796Please respect copyright.PENANAVEZmFjEq6Y
796Please respect copyright.PENANAPM7K0UNlse
黑色素除了跟金黃色葡萄球菌黃素一樣能夠抵擋游離基的攻擊外,其本身帶有負極的性質更能與兩隻帶有正極的常用抗真菌素(amphotericin B 及 caspofungin)結合,大大削弱藥物傷害真菌的能力。796Please respect copyright.PENANAvJ7r71mnH9
796Please respect copyright.PENANAtnBB1i5QfN
796Please respect copyright.PENANApWNlzUeOpg
延伸閱讀:796Please respect copyright.PENANA3K4P4MhSdG
深入淺出–從深海生物中發掘出抗真菌藥物796Please respect copyright.PENANA83pGwkjWWP
- 分享自 LIHKG 討論區796Please respect copyright.PENANALxH5DDs2IZ
https://lih.kg/2296185796Please respect copyright.PENANAudDbEzsr0I
796Please respect copyright.PENANAfOWwm3JMkx
796Please respect copyright.PENANAAeNoErCCAI
如果想我快啲出文的話,請入去Penana網站科普專欄–薯不揀單俾一個like以及Bookmark,這對我非常之重要。796Please respect copyright.PENANAHiQfSuQBJ7
796Please respect copyright.PENANAbT5gqGFVMy
Link: https://www.penana.com/story/66244/%E7%A7%91%E6%99%AE%E5%B0%88%E6%AC%84-%E8%96%AF%E4%B8%8D%E6%8F%80%E5%96%AE/toc796Please respect copyright.PENANA2x9G094TPZ
796Please respect copyright.PENANAahRFAKpwwI
同時亦可以在Penana網站裡按「買一嚿/半嚿薯仔」,以課金的方式推動我繼續搜羅資料寫文,多謝。796Please respect copyright.PENANAhrfA6J2pia
796Please respect copyright.PENANA7ZaZjVLMv8
Link:796Please respect copyright.PENANAzCMoCJUV0h
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio796Please respect copyright.PENANA11U2DvwcyT
796Please respect copyright.PENANAudKc5Jrbui
796Please respect copyright.PENANABrMDYtm1VB
除非Facebook及IG重開侵侵的account,否則我的IG將不會再作更新,只會寄居本土LIHKG及Penana。796Please respect copyright.PENANAOTIAxG5aTZ
796Please respect copyright.PENANAtHrkcC0KSD
Ref1:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2743764/796Please respect copyright.PENANAoAD6RwgZoY
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科普專欄–薯不揀單
作者:
薯仔聞茱莉

篇 #181
三十秒科學–黃金葡萄球菌的「黃金」
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