The plasmid cloning vector pBR322 is cleaved with the restriction endonuclease PstI. An isolated DNA fragment from a eukaryotic genome (also produced by PstI cleavage) is added to the prepared vector and ligated. The mixture of ligated DNAs is then used to transform bacteria, and plasmid-containing bacteria are selected by growth in the presence of tetracycline. The cloned DNA fragment is 1,000 bp long and has an EcoRI site 250 bp from one end. Three different recombinant plasmids are cleaved with EcoRI and analyzed by gel electrophoresis, giving the patterns shown below.   What does each pattern say about the cloned DNA

Biology: The Dynamic Science (MindTap Course List)
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ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
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Chapter18: Dna Technologies: Making And Using Genetically Altered Organisms, And Other Applications
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Problem 9TYK
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The plasmid cloning vector pBR322 is cleaved with the restriction endonuclease PstI. An isolated DNA fragment from a eukaryotic genome (also produced by PstI cleavage) is added to the prepared vector and ligated. The mixture of ligated DNAs is then used to transform bacteria, and plasmid-containing bacteria are selected by growth in the presence of tetracycline.

The cloned DNA fragment is 1,000 bp long and has an EcoRI site 250 bp from one end. Three different recombinant plasmids are cleaved with EcoRI and analyzed by gel electrophoresis, giving the patterns shown below.

 

What does each pattern say about the cloned DNA?

 

Note: pBR322, the PstI and EcoRI restriction sites are about 750 bp apart. The entire plasmid with no cloned insert is 4,361 bp. Size markers in lane 4 have the number of nucleotides noted.

ā
1
TABLE 9-2 Recognition
BamHi
EcoRI
EcoRV
Hall
|
3
Sequences for Some Type II Restriction Endonucleases
Hindill
Not!
Pa
Pwll
71111
(5) G GATCC (3)
CCTAGG
(5) ATC GAT (3)
TAGCTA
(5) GAATTC (3)
CTTAAG
(5) GATATC (3)
CTATAG
(5) GGCC (3)
CCGG
Nucleotide
length
5,000
3,000
1,500
1,000
750
500
250
↓
(5) AAGCTT (3)
TTCGAA
(5) GCG GCC GC (3)
сассааса
↑
(5) CTG CAG (3)
GACGTC
1.
(5) CAG CTG (3)
GTCGAC
(5) GACNNNGTC (3)
CTGNNNCAG
↑
Ampicillin
resistance
Kokl
Tetracycline
resistance
Sall
PBR22
Origin of
replication
FIGURE 9-4 The constructed E. coli plasmid p322. Note the lo
cation of some important restriction sites for P, Eco, Sal
and Pampicillin and tetracycline resistance genes; and the repli
early plas
cation origin ori). Constructed in 1977, this was one
mids designed expressly for cloning in E.col
Transcribed Image Text:ā 1 TABLE 9-2 Recognition BamHi EcoRI EcoRV Hall | 3 Sequences for Some Type II Restriction Endonucleases Hindill Not! Pa Pwll 71111 (5) G GATCC (3) CCTAGG (5) ATC GAT (3) TAGCTA (5) GAATTC (3) CTTAAG (5) GATATC (3) CTATAG (5) GGCC (3) CCGG Nucleotide length 5,000 3,000 1,500 1,000 750 500 250 ↓ (5) AAGCTT (3) TTCGAA (5) GCG GCC GC (3) сассааса ↑ (5) CTG CAG (3) GACGTC 1. (5) CAG CTG (3) GTCGAC (5) GACNNNGTC (3) CTGNNNCAG ↑ Ampicillin resistance Kokl Tetracycline resistance Sall PBR22 Origin of replication FIGURE 9-4 The constructed E. coli plasmid p322. Note the lo cation of some important restriction sites for P, Eco, Sal and Pampicillin and tetracycline resistance genes; and the repli early plas cation origin ori). Constructed in 1977, this was one mids designed expressly for cloning in E.col
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