This document discusses different methods for ligating DNA fragments with vectors, including DNA ligase, homopolymer tailing, linkers, and adaptors. It provides details on how each method works, such as using DNA ligase to join complementary cohesive ends, adding homopolymeric tails to fragments using terminal deoxynucleotidyl transferase, and how linkers and adaptors can be used to generate sticky ends for ligation. The basic difference between linkers and adaptors is that linkers have blunt ends while adaptors have cohesive ends.
MBB 501 PLANT BIOTECHNOLOGY
INFORMATION ABOUT DIFFERENT DNA MODIFYING ENZYMES
WHAT IS AN ENZYME?
Alkaline Phosphatase
Polynucleotide kinase
Terminal deoxyneucleotidyl transferase
Nucleases
Exonuclease
Bal31 Exonuclease III
Endonuclease
S1 endonulease
Deoxyribonuclease 1 (Dnase 1)
RNase A
RNase H
Restriction Endonuclease
PvuI
PvuII
Different types of endonuclease enzymes
The recognition sequences for some of the most frequently used restriction endonucleases.
Categorization of enzymes
Isoschizomers
Neoschizomers
Isocaudomers
BAC & YAC are artificially prepared chromosomes to clone DNA sequences.yeast artificial chromosome is capable of carrying upto 1000 kbp of inserted DNA sequence
MBB 501 PLANT BIOTECHNOLOGY
INFORMATION ABOUT DIFFERENT DNA MODIFYING ENZYMES
WHAT IS AN ENZYME?
Alkaline Phosphatase
Polynucleotide kinase
Terminal deoxyneucleotidyl transferase
Nucleases
Exonuclease
Bal31 Exonuclease III
Endonuclease
S1 endonulease
Deoxyribonuclease 1 (Dnase 1)
RNase A
RNase H
Restriction Endonuclease
PvuI
PvuII
Different types of endonuclease enzymes
The recognition sequences for some of the most frequently used restriction endonucleases.
Categorization of enzymes
Isoschizomers
Neoschizomers
Isocaudomers
BAC & YAC are artificially prepared chromosomes to clone DNA sequences.yeast artificial chromosome is capable of carrying upto 1000 kbp of inserted DNA sequence
molecular biology phage vector, full lifecycle and all necessary information regarding lambda phage, it contain 2 types that is insertion and replacement.
S1 Mapping is a laboratory method used for locating the start and end points of
transcripts and for mapping introns.
This technique is used for quantifying the amount of mRNA transcripts, it can therefore identify the level of transcription of the gene in the cell at a given time.
DNA ligase are used known as molecular glues.
There are 3 types of ligases used
1) DNA ligase
2) T4 infected Ecoli DNA ligase
3) terminal deoxynucleotidyl transferase
molecular biology phage vector, full lifecycle and all necessary information regarding lambda phage, it contain 2 types that is insertion and replacement.
S1 Mapping is a laboratory method used for locating the start and end points of
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This technique is used for quantifying the amount of mRNA transcripts, it can therefore identify the level of transcription of the gene in the cell at a given time.
DNA ligase are used known as molecular glues.
There are 3 types of ligases used
1) DNA ligase
2) T4 infected Ecoli DNA ligase
3) terminal deoxynucleotidyl transferase
Over the past few decades, molecular biologists have developed a number of techniques that can be used to build the structure of the target DNA seed sequence more quickly so as to simplify and standardize the cloning process.
The enzymes that effect change in the DNA chemical constitution or topology are generally referred to as DNA modifying enzymes.
All enzymes involved in genetic engineering (the degradation, synthesis and alteration of the nucleic acids) fall under the broad category of enzymes known as DNA modifying enzymes.
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LIGATION OF DNA
1. LIGATION OF DNA FRAGMENTS WITH
VECTORS
HOMOPOLYMER TAILING
LINKERS & ADAPTORS
MOHD SAQUIB KHAN
M.SC 3rd SEM
PONDICHERRY UNIVERSITY
2. LIGATION OF DNA FRAGMENT WITH
VECTORS
DNA ligation is the act of joining together DNA
strands with covalent bonds with the aim of
making new viable DNA or plasmid.
There are currently three methods for joining DNA
fragments in vitro.
The 1st of these is DNA ligase that covalently
joins the annealed cohesive ends produced by
certain restriction enzymes.
The 2nd depends upon the ability of DNA ligase
from phage T4-infected E. coli to catalyse the
formation of phosphodiester bonds.
3. The 3rd utilizes the enzyme terminal
deoxynucleotidyl transferase to synthesize
homopolymeric 3′ single-stranded tails at the
ends of fragments.
E.coli and phage T4 encode an enzyme DNA
ligase -T4 enzyme requires ATP while the E.
coli enzyme requires NAD+.
DNA fragments with either sticky ends or blunt
ends can be inserted into vector DNA with the
aid of DNA ligases.
4. LINKERS & ADAPTORS
Linker is a synthetic ,short and known double
stranded oligonucleotides sequence.
Having blunted ends on both sides and
restriction sites.
E.Coli DNA ligase will not catalyse blunt end
ligation except under special condition.
Linker can be ligated to both ends of the
foreign DNA.
5. Treatment with R.E produces sticky ends after
ligation with target DNA.
Sticky ends are desirable for DNA cloning
experiments.
One drawback is R.E. used to generate
cohesive end in the linker will also cut foreign
DNA at internal sites.
Solution to the problem is to choose another
restriction enzyme or to methylate internal
restriction sites on the foreign DNA.
6.
7. Alternatively a chemically synthesized adaptor
molecule which have a performed cohesive
end can be used.
An adaptor is a short, chemically
synthesized, double stranded DNA molecule
which is used to link the ends of two other
DNA molecules.
The adaptor molecule have one blunt end
bearing 5’ phosphate group & a cohesive end
which is not phosphorylated.
8. The use of adaptors: (a) the actual structure of an adaptor,
showing the modified 5′-OH terminus; (b) conversion of blunt
ends to sticky ends through the attachment of adaptors.
9. The foreign DNA plus added adaptors is then
phosphorylated at the 5’ termini and ligated into
the vector.
Problems: sticky end of adaptors will binds with
each other so treatment with Alkaline
Phosphates.
After attachment with target…… treatment
Polynucleotide Kinase to add P–OH at 5 prime.
The basic difference between an adaptor &
linker is that the former has cohesive ends &
the latter has blunt ends.
11. HOMOPOLYMER TAILING
Method for joining DNA molecules make use of
the annealing of complementary homopolymer
sequence.
Addition of oligo(dA) sequences to the 3’ ends
of one DNA molecule & oligo(dT) blocks to the
3’ end of another population.
The enzyme terminal deoxynucleotidyl
transferase will catalyze the addition of a string
of nucleotides to the 3' end of a DNA fragment.
One can add a string of G's to the 3' ends of
one fragment and a string of C's to the 3' ends
of the other fragment.
12. Homopolymer
tailing: (a )
synthesisof a
homopolymer tail;
(b) construction of
a recombinant
DNA molecule
from a tailed
vector plus tailed
insert DNA; (c)
repair of the
recombinant DNA
molecule.