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The sticky ends generated by restriction enzymes can easily be joined using an enzyme called ligase. Blunt ends however, cannot be joined so easily. This is why restiction enzymes that create sticky ends are more useful.

If blunt ends result, small segments called modifiers are attached to the sticky ends. These modifiers are nucleotide sequences that have sticky ends and attach to the blunt ends, thus making them sticky ends.

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14y ago
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5mo ago

Restriction enzymes create staggered cuts in the DNA sequence, resulting in overhanging or sticky ends. These ends have unpaired bases which can easily anneal to complementary sequences in another DNA fragment, facilitating their joining through base pairing and DNA ligase activity. This enables the creation of recombinant DNA molecules.

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15y ago

DNA cut with restriction enzymes that produce 'sticky ends' can be annealed with DNA from another source cut by the same enzyme. The ends complement one another according to the nucleotide pairing code and then the enzyme DNA ligase is used to reseal the sugar phosphate backbones.

.....CACAGT + AG...... annealed makes ......CACACT-AG..... and then DNA ligase fills

.....GT GTCATC...... ......GT-GTGATC......

the gaps represented by hyphens.

If a restriction enzyme yields blunt ends such as

.....CACAT cannot use the overlaps in sticky ends to exploit the nucleotide pairing code

.....GTGTA

but nevertheless special techniques and kits can be used to achieve blunt end recombination where the second DNA must be cut with the same or another blunt end cutter. The methods are much less efficient but they are doable.

Brian Dancer, Caerleon, S.Wales UK DNA cut with restriction enzymes that produce 'sticky ends' can be annealed with DNA from another source cut by the same enzyme. The ends complement one another according to the nucleotide pairing code and then the enzyme DNA ligase is used to reseal the sugar phosphate backbones.

.....CACAGT + AG...... annealed makes ......CACACT-AG..... and then DNA ligase fills

.....GT GTCATC...... ......GT-GTGATC......

the gaps represented by hyphens.

If a restriction enzyme yields blunt ends such as

.....CACAT cannot use the overlaps in sticky ends to exploit the nucleotide pairing code

.....GTGTA

but nevertheless special techniques and kits can be used to achieve blunt end recombination where the second DNA must be cut with the same or another blunt end cutter. The methods are much less efficient but they are doable.

Brian Dancer, Caerleon, S.Wales UK

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13y ago

A portion of the Answer appears in the Q'n [i. e. 'specific']. The Answer is: utter Specificity. Restriction enzymes may bind, and thereafter act, only at Specific 'Recognition Sequences'; of which there are millions to 'choose' from.

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12y ago

They can - and are - it's just harder. Non-sticky ends (typically called blunt ends) are routinely used in making recombinant DNA, particularly when there's no easily available cutting sites for sticky-ended restriction enzymes. The advantage of sticky ends is that they are specific (i.e. a sticky end cut by one enzyme will only ligate with a sticky end cut by another) and because the hydrogen bonding between bases of the sticky ends hold the ends together such that there is frequently a substrate available to be ligated by DNA ligase. Blunt ends lack this specificity and can be ligated onto any other blunt end and because there are no hydrogen bonding to hold blunt end joins together, the rate of the ligation reaction is far more inefficient.

That said, there are now many techniques that do not call for restriction enzymes at all to create recombinant DNA. Many of these techniques, which use recombinases and transposases to insert DNA molecules with the proper flanking sequences, in fact require blunt ended DNA to work properly.

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12y ago

DNA Ligase

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Q: How can a restriction enzyme leave sticky ends between DNA fragments?
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Which protein creates DNA fragments with sticky ends?

Restriction enzymes are proteins that can create DNA fragments with sticky ends by cleaving DNA at specific recognition sequences. The sticky ends refer to single-stranded overhangs that are complementary to each other, allowing for the fragments to easily anneal to each other during DNA recombination.


Why is it important to use the same restriction enzyme for both cells in recombinant DNA?

Using the same restriction enzyme ensures that both cells create compatible sticky ends on the DNA fragments, which increases the chances of successful DNA recombination. Mismatched sticky ends may not properly bind together, reducing the efficiency of the recombination process.


What happens when a restriction enzyme is used on DNA?

A restriction enzyme cuts the DNA at specific recognition sites, resulting in fragments of DNA. These fragments can be further analyzed or manipulated for various applications such as genetic engineering or DNA fingerprinting.


What is the restriction site of the restriction enzyme Hae III?

The restriction site of the restriction enzyme Hae III is GGCC. It recognizes and cuts this site in DNA, producing 4-base pair overhangs (sticky ends).


What is opened by a restriction enzyme?

A restriction enzyme opens up the double-stranded DNA molecule at specific recognition sites by cutting the DNA strands at those sites. This creates DNA fragments with sticky ends that can be used in molecular biology techniques like cloning and DNA sequencing.

Related questions

What seals the sticky ends of restriction fragments to make recombinant DNA?

DNA ligase seals the sticky ends of restriction fragments by catalyzing the formation of phosphodiester bonds between the nucleotides of the adjacent DNA fragments, creating recombinant DNA.


Which protein creates DNA fragments with sticky ends?

Restriction enzymes are proteins that can create DNA fragments with sticky ends by cleaving DNA at specific recognition sequences. The sticky ends refer to single-stranded overhangs that are complementary to each other, allowing for the fragments to easily anneal to each other during DNA recombination.


Why is it important to use the same restriction enzyme for both cells in recombinant DNA?

Using the same restriction enzyme ensures that both cells create compatible sticky ends on the DNA fragments, which increases the chances of successful DNA recombination. Mismatched sticky ends may not properly bind together, reducing the efficiency of the recombination process.


What happens when a restriction enzyme is used on DNA?

A restriction enzyme cuts the DNA at specific recognition sites, resulting in fragments of DNA. These fragments can be further analyzed or manipulated for various applications such as genetic engineering or DNA fingerprinting.


What is the restriction site of the restriction enzyme Hae III?

The restriction site of the restriction enzyme Hae III is GGCC. It recognizes and cuts this site in DNA, producing 4-base pair overhangs (sticky ends).


What is opened by a restriction enzyme?

A restriction enzyme opens up the double-stranded DNA molecule at specific recognition sites by cutting the DNA strands at those sites. This creates DNA fragments with sticky ends that can be used in molecular biology techniques like cloning and DNA sequencing.


What is a sticky end?

A Sticky End, referring to Biology is recombinant DNA. After DNA has been cut by a restriction enzyme it has "sticky ends" or recombinant DNA at the ends.


What is a restiction enzyme?

A restriction enzyme is an enzyme that can recognize specific DNA sequences, called recognition sites, and cut the DNA at or near these sites. These enzymes are commonly used in molecular biology for tasks such as cutting DNA into fragments for analysis or for creating recombinant DNA molecules.


What does the term sticky ends refer to in gene splicing?

Sticky ends are produced by cutting the DNA in a staggered manner within the recognition site producing single-stranded DNA ends. These ends have identical nucleotide sequence and are sticky because they can hydrogen-bond to complementary tails of other DNA fragments cut by the same restriction enzyme.


What is Example of restriction enzyme?

A restriction enzyme (also known as restriction endonuclease) is protein which cuts DNA up at specific sequences (called restriction sites) in a genome. For example, the commonly used restriction endonuclease EcoRI recognizes every DNA sequence GAATTC and cuts at the point between the guanine and the adenine in that sequence, forming blunt ends (or straight, even ends). Interestingly and coincidentially, the restriction site for most restriction enzymes are genetic palindromes (the sequence reads exactly the same backwards on the complementary strand). In the case of EcoRI, the two complementary DNA strands for the restriction site are:5'-- GAATTC --3'3'-- CTTAAG --5'After this DNA sequence is cut, it might look something like this:5'-- G AATTC --3'3'-- C TTAAG --5'


What does the formation of recombinant DNA result from?

Recombinant DNATo to make recombinant DNA or plasmids, the two different samples of DNA need to be cut up by the same restriction enzyme. Restriction enzymes cut DNA at specific sequences (restriction sites) and is usually a staggered cut. For example, say you had the following sequence of DNA (both strands): 5' GAATTC 3'3' CTTAAG 5'Say the restriction enzyme used will cut a strand between a guanine and adenine on one strand and an adenine and guanine one the other strand. For the given DNA, there would be cuts where the bars are:5' G|AATTC 3'3' CTTAA|G 5'Then the strands would separate:5' G--------AATTC 3'3' CTTAA--------G 5'Because the cuts are staggered, hydrogen bonds are left open. The ends of the restriction fragments are called "sticky ends" because of their ability to bond to other fragments. Remember that both sets of DNA are cut with the same restriction enzyme. Therefore, the sticky ends of the restriction fragments are complementary to each other. Then you're able to take one fragment of one DNA sample and insert it into the other DNA sample, which are bound together by hydrogen bonds. DNA ligase is then added to seal the ends together.


Use E co RI and MseI in AFLP analysis?

Chop DNA into pieces using you restriction enzyme(s) of choice. Add adapter to sticky end, you know the sequence of the sticky end as it corrisponds to the restriction enzyme used. Use a primer for the adaptor and amplify the DNA with PCR. Ta dah you just amplified somthing you didn't have a primer for. Run the amplified DNA on a gel and you can see changes between your samples.