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

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68<br />

Figure 4.25<br />

The use of adaptors: (a) the actual structure of an<br />

adaptor, showing the modified 5′-OH terminus;<br />

(b) conversion of blunt ends to sticky ends<br />

through the attachment of adaptors.<br />

Figure 4.26<br />

Homopolymer tailing: (a) synthesis of a<br />

homopolymer tail; (b) construction of a<br />

recombinant <strong>DNA</strong> molecule from a tailed vector<br />

plus tailed insert <strong>DNA</strong>; (c) repair of the<br />

recombinant <strong>DNA</strong> molecule.<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 />

(a) The precise structure of an adaptor<br />

HO<br />

The modified<br />

5’-OH terminus<br />

(a) Synthesis of a homopolymer tail<br />

(b) Ligation of homopolymer tails<br />

Vector - poly(dC)<br />

tails<br />

G<br />

(b) Ligation using adaptors<br />

OH<br />

HO<br />

HO<br />

OH<br />

2– O3 P<br />

Blunt-ended<br />

molecule<br />

3’<br />

5’ 5’<br />

Terminal<br />

transferase<br />

+ dCTP<br />

C CC<br />

C<br />

C<br />

C<br />

C<br />

C CC<br />

+<br />

A T C C C G G<br />

G GG<br />

G<br />

G GG<br />

G<br />

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

- poly(dG) tails<br />

G G C C<br />

HO 2– PO3 <strong>DNA</strong> ligase<br />

(c) The repair steps<br />

Nick<br />

G G G G<br />

C C C C C C C<br />

Discontinuity<br />

Klenow polymerase<br />

repairs the nick<br />

G G G G G G G<br />

C C C C C C C<br />

Ligase repairs<br />

the discontinuities<br />

OH<br />

Polynucleotide kinase<br />

HO<br />

Recombinant<br />

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

OH<br />

Adaptor<br />

HO<br />

OH<br />

2– PO3 5’-P terminus<br />

3’<br />

CCCCCCCCCCC<br />

C<br />

G CCCC<br />

GGGG<br />

G<br />

G<br />

G<br />

C G<br />

G<br />

CCCC

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