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Basic Methods in Cellular and Molecular Biology
Plasmid DNA Cleanup from Bacterial Cells
Description
Plasmid DNA cleanup from bacterial cells is a lab method for separating plasmid DNA from genomic DNA, proteins, ribosomes, and the bacterial cell wall. A plasmid is a small, circular, double-stranded DNA molecule that carries a specific DNA fragment. After transformation into a host organism, the plasmid is replicated and ma...
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Transcript
质粒是独立于染色体的环状DNA分子。在分子生物学中,他们被用作运送分子,或称载体,用于承载特定的DNA片段。利用细菌来复制质粒,可以大规模生产目的DNA。这个被研究人员用来从细菌中获得质粒的方法称为质粒纯化,将在本短片中得到讲解。
质粒纯化当然是指纯化质粒,但这具体是什么意思呢?要纯化质粒就是将质粒从细菌的染色体、蛋白质、细菌胞膜和细菌核糖体中分离出来。
尽管纯化质粒的试剂盒有很多种,但它们的基本原理都是一样的。首先,挑取细菌菌落在含正确抗生素的合适培养液中生长。由于质粒有编码抗生素抗性基因,只有那些含有该种质粒的细菌才能在这种培养液中生长。然后收获细菌,在高pH条...
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