黃金葡萄球菌這字眼,周不時亦會在新聞媒體聽得到。795Please respect copyright.PENANAaFuaOIsr0k795Please respect copyright.PENANAt5B5xIvV4j
795Please respect copyright.PENANAs462cCNB19
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。795Please respect copyright.PENANAatcWQzbFDQ
795Please respect copyright.PENANAfBFWVSvdm9
(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。795Please respect copyright.PENANAViBPqTAyWv795Please respect copyright.PENANAktm0UpfPbT
795Please respect copyright.PENANA7Ue9y4ol5z
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。795Please respect copyright.PENANAgVpaC2xAnd
795Please respect copyright.PENANAWYiD4mv4hj
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。795Please respect copyright.PENANAY7FwWmGS6K
795Please respect copyright.PENANArfzJZr014W
(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。795Please respect copyright.PENANApXJRMEiy7l795Please respect copyright.PENANAJrA7xdt61N
795Please respect copyright.PENANApiIxlftL6I
(圖4)再舉另外一道例子,Cryptococcus neoformans是一種真菌(fungus),795Please respect copyright.PENANAuBWEJnnW7z
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。795Please respect copyright.PENANAMvz7XRqrcn795Please respect copyright.PENANAfof1u5EHW4
795Please respect copyright.PENANA3eEwffkCQ2
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。795Please respect copyright.PENANAroHUF2R2yn
795Please respect copyright.PENANAup7ZB14UnF
795Please respect copyright.PENANA0hmClaKQag
延伸閱讀:795Please respect copyright.PENANAWXDKTYJXtm
深入淺出–從深海生物中發掘出抗真菌藥物795Please respect copyright.PENANA5nFzbE5m8r
- 分享自 LIHKG 討論區795Please respect copyright.PENANAGT4ZSili2u
https://lih.kg/2296185795Please respect copyright.PENANAXHTK66KCIH
795Please respect copyright.PENANAwOvTEAxI3b
795Please respect copyright.PENANA6yDoUpSbRs
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。795Please respect copyright.PENANAJSXUcoYmUZ
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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/toc795Please respect copyright.PENANAPTyHhpkZ4e
795Please respect copyright.PENANAozlcgsE8fY
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。795Please respect copyright.PENANAirqKDcwfuW
795Please respect copyright.PENANAoKs8YW0ITa
Link:795Please respect copyright.PENANAfax53zzSQy
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio795Please respect copyright.PENANAiuhf556G8Z
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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。795Please respect copyright.PENANA9rtdFNVeiv
795Please respect copyright.PENANAJr6ybp5OfL
Ref1:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2743764/795Please respect copyright.PENANAqD7SpTaDD7
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科普專欄–薯不揀單
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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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