NTCC?甲烷氧化菌OB3b 指的是 Methylosinus trichosporium OB3b 菌株。這是一種重要的、經(jīng)過(guò)深入研究的甲烷氧化細(xì)菌，被廣泛用作該領(lǐng)域的模式生物。

主要特點(diǎn)

• 分類(lèi): 屬于 II 型甲烷氧化菌，是一種好氧、革蘭氏陰性細(xì)菌。

• 甲烷代謝: 這種細(xì)菌以甲烷作為唯一的碳源和能源。它通過(guò)兩種關(guān)鍵酶——可溶性甲烷單加氧酶 (sMMO) 和顆粒性甲烷單加氧酶 (pMMO)——將甲烷氧化成甲醇。

• 銅離子調(diào)控 (Copper Switch): OB3b 菌株的一個(gè)顯著特征是它會(huì)根據(jù)環(huán)境中銅離子的濃度來(lái)調(diào)節(jié)其甲烷單加氧酶的表達(dá)。

  • 低銅環(huán)境: 菌株會(huì)表達(dá) sMMO。sMMO 是一種胞質(zhì)酶，具有廣泛的底物特異性，因此除了甲烷外，它還能降解多種有機(jī)污染物。

  • 高銅環(huán)境: 菌株則會(huì)表達(dá) pMMO。pMMO 是一種膜結(jié)合酶，對(duì)甲烷具有更高的親和力。

• 聚羥基丁酸酯 (PHB) 生產(chǎn): 該菌株能夠生產(chǎn)大量的 PHB，這是一種可降解的生物塑料。在某些研究中，OB3b 菌株的 PHB 含量可高達(dá)其干細(xì)胞重量的67%，是目前已知的甲烷氧化菌中最高的。

• 甲烷氧化菌素 (Methanobactin) 產(chǎn)生: 在銅離子缺乏時(shí)，OB3b 菌株會(huì)分泌一種被稱(chēng)為甲烷氧化菌素（Methanobactin）的銅螯合劑。這種小分子肽能夠從環(huán)境中高效地捕獲銅離子，并將其轉(zhuǎn)運(yùn)到細(xì)胞內(nèi)，以激活 pMMO。

研究應(yīng)用

Methylosinus trichosporium OB3b 菌株因其獨(dú)特的代謝特性，在多個(gè)研究領(lǐng)域中具有重要價(jià)值：

• 生物技術(shù): 利用其將甲烷轉(zhuǎn)化為甲醇的能力，OB3b 菌株被用于開(kāi)發(fā)將天然氣或沼氣轉(zhuǎn)化為高價(jià)值化學(xué)品（如甲醇）或生物塑料（如 PHB）的生物技術(shù)方法。

• 環(huán)境修復(fù): 由于 sMMO 具有降解多種鹵代烴等污染物的能力，OB3b 菌株被研究用于生物修復(fù)被污染的土壤和地下水。

• 全球碳循環(huán): 甲烷是一種強(qiáng)效溫室氣體。研究 OB3b 等甲烷氧化菌有助于我們理解它們?cè)跍p少大氣甲烷含量、減緩溫室效應(yīng)中的作用。

• 酶學(xué)研究: 它的雙重甲烷單加氧酶系統(tǒng)是研究酶活性、金屬離子調(diào)控和蛋白質(zhì)結(jié)構(gòu)與功能關(guān)系的理想模型。

BioVector NTCC質(zhì)粒載體菌種細(xì)胞蛋白抗體基因保藏中心

BioVector NTCC Inc.

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NTCC?Methylosinus trichosporium OB3b is a well-studied strain of methanotrophic bacteria that serves as a model organism in the field. It's known for its ability to oxidize methane as its sole source of carbon and energy.

Key Characteristics

• Classification: It's a type II methanotroph, an aerobic, Gram-negative bacterium.

• Methane Metabolism: This strain uses methane as its only source of carbon and energy. It oxidizes methane to methanol using two key enzymes: soluble methane monooxygenase (sMMO) and particulate methane monooxygenase (pMMO).

• Copper Regulation (Copper Switch): A defining feature of the OB3b strain is its ability to regulate the expression of its methane monooxygenases based on the concentration of copper ions in the environment.

  • Low Copper: The strain expresses sMMO. This is a cytoplasmic enzyme with broad substrate specificity, allowing it to degrade various organic pollutants in addition to methane.

  • High Copper: The strain expresses pMMO. This is a membrane-bound enzyme with a higher affinity for methane.

• Polyhydroxybutyrate (PHB) Production: The strain can produce large amounts of PHB, a biodegradable bioplastic. In some studies, the PHB content of the OB3b strain has been found to be as high as 67% of its dry cell weight, one of the highest known among methanotrophs.

• Methanobactin Production: In the absence of copper, the OB3b strain secretes a small copper-chelating peptide called methanobactin. This molecule efficiently captures copper ions from the environment and transports them into the cell to activate pMMO.

Research Applications

Due to its unique metabolic properties, the Methylosinus trichosporium OB3b strain is valuable in several research areas:

• Biotechnology: Researchers use its ability to convert methane to methanol to develop biotechnological methods for converting natural gas or biogas into high-value chemicals like methanol or bioplastics like PHB.

• Environmental Remediation: Because sMMO can degrade various pollutants, including halogenated hydrocarbons, the OB3b strain is being studied for the bioremediation of contaminated soil and groundwater.

• Global Carbon Cycle: Methane is a potent greenhouse gas. Studying methanotrophs like OB3b helps us understand their role in reducing atmospheric methane levels and mitigating the greenhouse effect.


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• Enzymology: Its dual methane monooxygenase system makes it an ideal model for studying enzyme activity, metal ion regulation, and the relationship between protein structure and function

BioVector NTCC質(zhì)粒載體菌種細(xì)胞蛋白抗體基因保藏中心

BioVector NTCC Inc.

TEL: 400-800-2947, 189-0126-8599

E-mail: [email protected]

http://www.nedfriskphoto.com