biochemistry 2/e - garrett & grisham copyright © 1999 by harcourt brace & company chapter...
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Biochemistry 2/e - Garrett & Grisham
Copyright © 1999 by Harcourt Brace & Company
Chapter 13
Recombinant DNA: Cloning and Creation of Chimeric Genes
to accompany
Biochemistry, 2/e
by
Reginald Garrett and Charles Grisham
All rights reserved. Requests for permission to make copies of any part of the work should be mailed to: Permissions Department, Harcourt Brace & Company, 6277 Sea Harbor Drive, Orlando, Florida 32887-6777
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Biochemistry 2/e - Garrett & Grisham
Copyright © 1999 by Harcourt Brace & Company
Outline
• 13.1 Cloning
• 13.2 DNA Libraries
• 13.3 Polymerase Chain Reaction (PCR)
• 13.4 Recombinant DNA Technology
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Biochemistry 2/e - Garrett & Grisham
Copyright © 1999 by Harcourt Brace & Company
13.1 CloningClone: a collection of molecules or cells, all
identical to an original molecule or cell • To "clone a gene" is to make many copies of
it - for example, in a population of bacteria • Gene can be an exact copy of a natural gene • Gene can be an altered version of a natural gene • Recombinant DNA technology makes it possible
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Biochemistry 2/e - Garrett & Grisham
Copyright © 1999 by Harcourt Brace & Company
Plasmids
Naturally occurring extrachromosomal DNA
• Plasmids are circular dsDNA
• Plasmids can be cleaved by restriction enzymes, leaving sticky ends
• Artificial plasmids can be constructed by linking new DNA fragments to the sticky ends of plasmid
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Biochemistry 2/e - Garrett & Grisham
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Biochemistry 2/e - Garrett & Grisham
Copyright © 1999 by Harcourt Brace & Company
Cloning Vectors
Plasmids that can be modified to carry new genes
• Plasmids useful as cloning vectors must have – a replicator (origin of replication)
– a selectable marker (antibiotic resistance gene)
– a cloning site (site where insertion of foreign DNA will not disrupt replication or inactivate essential markers
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Biochemistry 2/e - Garrett & Grisham
Copyright © 1999 by Harcourt Brace & Company
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Biochemistry 2/e - Garrett & Grisham
Copyright © 1999 by Harcourt Brace & Company
Chimeric PlasmidsNamed for mythological beasts with body
parts from several creatures
• After cleavage of a plasmid with a restriction enzyme, a foreign DNA fragment can be inserted
• Ends of the plasmid/fragment are closed to form a "recombinant plasmid"
• Plasmid can replicate when placed in a suitable bacterial host
• See Figure 13.3
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Biochemistry 2/e - Garrett & Grisham
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Biochemistry 2/e - Garrett & Grisham
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Biochemistry 2/e - Garrett & Grisham
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Biochemistry 2/e - Garrett & Grisham
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Directional CloningOften one desires to insert foreign DNA in a
particular orientation
• This can be done by making two cleavages with two different restriction enzymes
• Construct foreign DNA with same two restriction enzymes
• Foreign DNA can only be inserted in one direction
• See Figure 13.6
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Biochemistry 2/e - Garrett & Grisham
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Biochemistry 2/e - Garrett & Grisham
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Biochemistry 2/e - Garrett & Grisham
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Biochemistry 2/e - Garrett & Grisham
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13.2 DNA Libraries
Sets of cloned DNA fragments that together represent the genes of a particular
organism
• Any particular gene may represent a tiny, tiny fraction of the DNA in a given cell
• Can't isolate it directly
• Trick is to find the fragment or fragments in the library that contain the desired gene
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Biochemistry 2/e - Garrett & Grisham
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Biochemistry 2/e - Garrett & Grisham
Copyright © 1999 by Harcourt Brace & Company
DNA Libraries - IIThe probabilities are staggering!
• Consider the formula on page 406 for probability of finding a particular fragment in N clones
• Suppose you seek a 99% probability of finding a given fragment in N clones of 10 kbp fragments
• If your library is from the human genome, you would need 1,400,000 clones to reach 99% probability of finding the fragment of interest!
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Biochemistry 2/e - Garrett & Grisham
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Colony Hybridization
A way to screen plasmid-based genome libraries for a DNA fragment of interest
• Host bacteria containing a plasmid-based library of DNA fragments are plated on a petri dish and allowed to grow overnight to form colonies
• Replica of dish made with a nitrocellulose disk
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Biochemistry 2/e - Garrett & Grisham
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Colony Hybridization
• Disk is treated with base or heated to convert dsDNA to ssDNA and incubated with probes
• Colonies that bind probe (with P-32) hold the fragment of interest
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Biochemistry 2/e - Garrett & Grisham
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Southern BlotsAnother way to find desired fragments
• Subject the DNA library to agarose gel electrophoresis
• Soak gel in NaOH to convert dsDNA to ssDNA • Neutralize and blot gel with nitrocellulose sheet • Nitrocellulose immobilizes ssDNA • Incubate sheet with labelled oligonucleotide
probes • Autoradiography should show location of
desired fragment(s)
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Biochemistry 2/e - Garrett & Grisham
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The Polymerase Chain Reaction
What if you don't have enough DNA for colony hybridization or Southern blots?
• The small sample of DNA serves as template for DNA polymerase
• Make complementary primers
• Add primers in more than 1000-fold excess
• Heat to make ssDNA, then cool
• Run DNA polymerase (usually Taq)
• Repeat heating, cooling, polymerase cycle
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