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Gene Cloning and DNA Analysis: An Introduction, Sixth Edition ...

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108<br />

Figure 7.4<br />

<strong>Cloning</strong> with an E. coli–yeast shuttle vector such<br />

as YEp13.<br />

Figure 7.5<br />

Recombination between plasmid <strong>and</strong><br />

chromosomal LEU2 genes can integrate YEp13<br />

into yeast chromosomal <strong>DNA</strong>. After integration<br />

there are two copies of the LEU2 gene; usually<br />

one is functional, <strong>and</strong> the other mutated.<br />

Recombinant YEp13 molecules<br />

The desired<br />

recombinant<br />

tet R<br />

Mutated LEU2<br />

LEU2<br />

amp R<br />

Self-ligated<br />

vector<br />

Transform<br />

E. coli<br />

Transform<br />

yeast<br />

Yeast<br />

recombinant<br />

YEp13<br />

LEU2<br />

Recombination<br />

LEU2 LEU2<br />

Plasmid <strong>DNA</strong><br />

E. coli clones<br />

Ampicillin medium<br />

Purify <strong>DNA</strong> from<br />

several clones,<br />

identify correct<br />

molecule<br />

Minimal medium<br />

– no leucine<br />

Yeast<br />

chromosomal<br />

<strong>DNA</strong><br />

in insertion of the entire plasmid into one of the yeast chromosomes (Figure 7.5). The<br />

plasmid may remain integrated, or a later recombination event may result in it being<br />

excised again.<br />

7.1.4 Other types of yeast cloning vector<br />

Part I The Basic Principles of <strong>Gene</strong> <strong>Cloning</strong> <strong>and</strong> <strong>DNA</strong> <strong><strong>An</strong>alysis</strong><br />

In addition to YEps, there are several other types of cloning vector for use with S.<br />

cerevisiae. Two important ones are as follows:<br />

l Yeast integrative plasmids (YIps) are basically bacterial plasmids carrying a<br />

yeast gene. <strong>An</strong> example is YIp5, which is pBR322 with an inserted URA3 gene

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