Isolation of Plasmid Dna by Alkali-Lysis Method

1. INTRODUCTION 1.1 PLASMID plasmid DNAs are extra chromosomal contractable material. They are rotund molecule of DNA that led an self-employed person existence in b make uperial cell. plasmid DNA has pileus skill of self replication or may be integrating with bacterial chromosome. Plasmid has at least unity DNA sequence that can act as an neckcloth of replication. Plasmid almost always give birth cardinal or more gene which is responsible for a utilitarian characteristic displayed by bacteria .e.g. Antibiotic protection gene, and then it is used as selectable marker. All plasmid DNA DNA suffer atleast one DNA sequence that can act as an origin of replication, so they are able to cryptograph with the cell quite independently of the main bacterial chromosome. The short plasmids make use of the host cells let DNA replicative enzymes in score to make copies of themselves, whereas some of the volumed ones carry genes that code for special enzymes that are specific for plasmid replication. Size and copy number of plasmid is an important ingest of plasmids for cloning purpose e.g. plasmid ranging from 6-10 Kb is very cheering for cloning and having copy number as many as 50. Plasmid may be of following type: F-Plasmid: having cleverness to promote conjugal transfer of plasmid e.g. F-Plasmid of E.

coli R-Plasmid: responsible for providing foe to host against foreign bodies such as anti bacterial resistance e.g. RP4 of Pseudomonas Col-Plasmid: codes for colicins, protein that kills other bacteria e.g. ColE1 of E.coli and Pvocine of Pseudomonas Degradative Plasmid: it allows the bacteria to metabolize unusual molecule such a s toluene and salicylic venereal disease e.! g. TOL of Pseudomonas putida Virulence Plasmid: it confers pathogenicity on the host bacterium e.g. Plasmid of Agrobacterium. Essential features of an archetype plasmid cloning vector sharp size: piteous molecular weight, are easier to handle, present in multiple copies, do not get damaged during isolation, surmount through cell...If you wish to get a full essay, order it on our website: OrderEssay.net

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