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TOOLS OF RECOMBINANT
DNA TECHNOLOGY
How do scientists create a fully functional new DNA from two separate
fragments, how do they create fragments? and, choose the genes in new
DNA of their choice when they can’t even see it? Today you’ll know…!
RESTRICTION
ENZYMES:
ENDONUCLEASES (CUT THE DNA AT ANY SITE
BETWEEN THEM) , AND EXONUCLEASES (CUT
THE ENDS OF DNA FRAGMENTS)…
HOW DO SCIENTISTS MAKE RESTRICTION ENZYMES FIRST OF
ALL???
ANSWER: THEY DIDN’T MAKE IT, IT WAS DISCOVERED FROM
BACTERIA: E.COLI,
IT’S NATURALLY FOUND IN THEM…
• NOW YOU’D ASK….
WHY BACTERIA NEED
THESE ENZYMES!!
THEY CAN’T MAKE
ANY GMO’S… THEY’RE
NOT
BIOTECHNOLOGISTS!!!
• THIS ENZYMES MAKE
THEM IMMUNE TO
BACTERIOPHAGE… A
VIRUS, WHO IS
PATHOGENIC TO THEM
•These are also called
molecular scissors
Restriction
enzymes recognise
only palindromic
sequences…
Example of
palindrome:
1. LOL 2.MOM
3.Borrow or rob
4. Murder for a jar of
red rum
GEL
ELECTROPHORESIS
1.It used to separate fragments obtained by
gel electrophoresis
2. DNA is negatively charge, so in an
electric field, they move from cathode to
anode
3. But their size determines the distance
till which they pass through
3. A matrix is filled in the gel
electrophoresis system, through which the
fragments pass
4. This medium is most commonly agarose
5. Thus the gel in gel electrophoresis
stands for this agarose gel (or if any other
medium is used, then that)
6. Fragments are stained using ethidium
bromide, by which, we can locate these
elctrophoresed fragment in UV light; they’ll
show bright orange coloured strands.
7. ELUTION: extraction of DNA from gel
after electrophoresis
HERE ARE SOME PRACTISE
QUESTIONS FOR YOU…
NOW… CAN YOU ANSWER
SOME QUESTIONS ON
TODAY’S TOPIC???
Q.7 __________ JOINS DNA SEGMENTS?
Q.8 DNA HAS A _____________CHARGE?
Q.9 STICKY ENDS HELP IN FUNCTIONING OF
___________ ENZYME
Q.10 RESTRICTION ENZYMES SHOULD NOT
HAVE MORE THAN ONE SITE OF ACTION IN
THE CLONING SITE OF A VECTOR. COMMENT.
• Enzymes that remove nucleotides one at a time from the end of
a DNA molecule are called ____________
a) Ligases
b) Exonucleases
c) Endonucleases
d) Modifying enzymes
• Host controlled restriction is a phenomenon related to ________
a) Bacteria
b) Virus
c) Plasmid
d) Gene of interest
• The restriction endonuclease AluI is isolated from which
microbe?
a) Proteus Vulgaris
b) Staphylococcus Aureus
c) Arthrobacter Luteus
d) Haemophilus Influenzae
• Which type of restriction endonucleases is used most in
genetic engineering?
a) Type I
b) Type II
c) Type III
d) Type IV
THANK
YOU…

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Restriction Enzymes full content

  • 1. TOOLS OF RECOMBINANT DNA TECHNOLOGY How do scientists create a fully functional new DNA from two separate fragments, how do they create fragments? and, choose the genes in new DNA of their choice when they can’t even see it? Today you’ll know…!
  • 2.
  • 3. RESTRICTION ENZYMES: ENDONUCLEASES (CUT THE DNA AT ANY SITE BETWEEN THEM) , AND EXONUCLEASES (CUT THE ENDS OF DNA FRAGMENTS)…
  • 4. HOW DO SCIENTISTS MAKE RESTRICTION ENZYMES FIRST OF ALL??? ANSWER: THEY DIDN’T MAKE IT, IT WAS DISCOVERED FROM BACTERIA: E.COLI, IT’S NATURALLY FOUND IN THEM…
  • 5. • NOW YOU’D ASK…. WHY BACTERIA NEED THESE ENZYMES!! THEY CAN’T MAKE ANY GMO’S… THEY’RE NOT BIOTECHNOLOGISTS!!! • THIS ENZYMES MAKE THEM IMMUNE TO BACTERIOPHAGE… A VIRUS, WHO IS PATHOGENIC TO THEM
  • 6. •These are also called molecular scissors
  • 7. Restriction enzymes recognise only palindromic sequences… Example of palindrome: 1. LOL 2.MOM 3.Borrow or rob 4. Murder for a jar of red rum
  • 8.
  • 9.
  • 10.
  • 11.
  • 12.
  • 13.
  • 14.
  • 16.
  • 17. 1.It used to separate fragments obtained by gel electrophoresis 2. DNA is negatively charge, so in an electric field, they move from cathode to anode 3. But their size determines the distance till which they pass through 3. A matrix is filled in the gel electrophoresis system, through which the fragments pass 4. This medium is most commonly agarose 5. Thus the gel in gel electrophoresis stands for this agarose gel (or if any other medium is used, then that) 6. Fragments are stained using ethidium bromide, by which, we can locate these elctrophoresed fragment in UV light; they’ll show bright orange coloured strands. 7. ELUTION: extraction of DNA from gel after electrophoresis
  • 18.
  • 19.
  • 20. HERE ARE SOME PRACTISE QUESTIONS FOR YOU…
  • 21.
  • 22.
  • 23.
  • 24.
  • 25. NOW… CAN YOU ANSWER SOME QUESTIONS ON TODAY’S TOPIC???
  • 26.
  • 27.
  • 28.
  • 29.
  • 30. Q.7 __________ JOINS DNA SEGMENTS? Q.8 DNA HAS A _____________CHARGE? Q.9 STICKY ENDS HELP IN FUNCTIONING OF ___________ ENZYME Q.10 RESTRICTION ENZYMES SHOULD NOT HAVE MORE THAN ONE SITE OF ACTION IN THE CLONING SITE OF A VECTOR. COMMENT.
  • 31. • Enzymes that remove nucleotides one at a time from the end of a DNA molecule are called ____________ a) Ligases b) Exonucleases c) Endonucleases d) Modifying enzymes • Host controlled restriction is a phenomenon related to ________ a) Bacteria b) Virus c) Plasmid d) Gene of interest
  • 32. • The restriction endonuclease AluI is isolated from which microbe? a) Proteus Vulgaris b) Staphylococcus Aureus c) Arthrobacter Luteus d) Haemophilus Influenzae • Which type of restriction endonucleases is used most in genetic engineering? a) Type I b) Type II c) Type III d) Type IV