Name: dna cutting sites and bacterial defense
Uploaded: 2023-04-30T10:14:13.000Z
Duration: 1 min 11 s
Channel: JoVE

K12 Standards

north-carolina-k-12-science-standard-course-of-study

NC K-12 Science Standard Course of Study

9-12

Biology

heredity-inheritance-and-variation-of-traits

Heredity- Inheritance and Variation of Traits

LS.Bio.8.1

Restriction Enzymes

Isolierte DNA kann an bestimmten Stellen durch Enzyme, sogenannte Restriktionsendonukleasen, geschnitten werden.
Restriktionsenzyme werden aus Bakterien isoliert. Sie erkennen und spalten die DNA an vier bis acht spezifischen Nukleotiden in einer palindromischen Sequenz; Eine Sequenz, die auf einem Strang in 5'- bis 3'-Richtung und auf dem komplementären Strang in 3'- bis 5'-Richtung gleich ist.
Schneidet die Endonuklease symmetrisch zwischen zwei gegenüberliegenden Basen auf komplementären DNA-Strängen, so haben die resultierenden DNA-Fragmente stumpfe Enden.
Wenn die Endonuklease gestaffelte Schnitte über die beiden DNA-Stränge macht und jedes Fragment mit einem Überhang aus ungepaarten Basen zurücklässt, dann werden die Enden der DNA-Fragmente als klebrig bezeichnet.
Das klebrige Ende eines DNA-Fragments kann sich mit dem einzelsträngigen Überhang eines anderen DNA-Stücks paaren, das von demselben Restriktionsenzym geschnitten wurde.
Verschiedene DNA-Fragmente mit sequenzspezifischen Enden können zu neuen rekombinanten DNA-Konstrukten verbunden werden.

<ol>
	<li>Kaneko, Kotaro J., John M. Burke und Lawrence J. Kaplan. "Die Wirkung von Endonukleasen und Methylasen: Elektrophoretische Analyse von DNA-Restriktionsfragmenten." Zeitschrift für chemische Bildung 64, Nr. 3 (1987): 274.</li>
	<li>Oakes, Christopher C., Sophie La Salle, Jacquetta M. Trasler und Bernard Robaire. "Restriktionsverdauung und Echtzeit-PCR (qAMP)." In DNA-Methylierung, S. 271-280. Humana Press, 2009.</li>
	<li>Del Olmo, Marcel Li, Agustin Aranda, Jose E. Perez-Ortin und Vicente Tordera. "Nachweis von Nicht-B-DNA-Sekundärstrukturen durch S1-Nuklease-Verdau." Zeitschrift für chemische Bildung 75, Nr. 6 (1998): 762.</li>
</ol>

restriktionsenzyme

Restriktionsenzyme sind bakterielle Enzyme, die dazu verwendet werden, DNA auf sequenzspezifische Weise zu schneiden. Um DNA zu spalten, binden sie an spezifische palindromische Sequenzen, die als Restriktionsstellen bezeichnet werden. Solche palindromischen DNA-Sequenzen oder invertierten Wiederholungen finden sich häufig in Bereichen von funktioneller Bedeutung, wie dem Replikationsursprung, Gen-Operatorstellen und Regionen, die Transkriptionsterminationssignale enthalten.

Die Wirtsbakterien schützen ihre eigene genomische DNA vor diesen Enzymen, indem sie diese Stellen methylieren. Einige Bakterien besitzen Enzyme, die sowohl die Fähigkeit haben, die DNA zu schneiden als auch zu methylieren, und zwar mit derselben Sequenzspezifität. EcoRI fungiert als Restriktionsenzym, wenn es ein Dimer identischer Untereinheiten ist. Als Monomer fungiert es als Methylase. Andere Bakterien verfügen über zwei verschiedene Enzyme, um jede Funktion auszuführen. Diese Strategie der Restriktion und Modifikation verhindert, dass bakterielle Viren das bakterielle Genom angreifen.

Da verschiedene Bakterienarten unterschiedliche Restriktionsenzyme produzieren, hat jedes Enzym eine einzigartige Restriktionsstelle und wird nach dem Bakterium benannt, aus dem es isoliert wurde. Zum Beispiel wird EcoRI aus dem E.coli-Stamm RY13 isoliert.

Wenn DNA mit einem bestimmten Restriktionsenzym verdaut wird, haben alle produzierten Fragmente dieselbe Sequenz an ihren 5'- und 3'-Enden. Wenn daher eine Plasmid-DNA und ein Insert mit demselben Restriktionsenzym geschnitten werden, haben sie komplementäre Enden, die leicht ligiert werden können. Die Fragmente werden normalerweise auf einem Agarosegel aufgetrennt, um zu bestätigen, dass die Länge der verdauten DNA der erwarteten Länge des Fragments entspricht.

Restriktionsenzyme

Restriktionsenzyme sind bakterielle Enzyme, die verwendet werden, um DNA sequenzspezifisch zu schneiden. Um DNA zu spalten, binden sie an spezifische palindromische Sequenzen, die als ...

Education

Lehre

JoVE Core

Molecular Biology

Molekularbiologie

Unit 2

Einheit 2

Studying DNA and RNA

Untersuchung von DNA und RNA

KEY TERMS AND CONCEPTS

KERNBEGRIFFE UND KONZEPTE

dna cutting sites and bacterial defense

Restriction enzymes are bacterial proteins that cut DNA at specific sequence sites. They recognize palindromic DNA sequences, also called inverted repeats, and cut the DNA in a sequence-specific way. These sites are often found in regions with important functions, such as the origin of replication, gene operator sites, and transcription termination signals.

Bacteria protect their own DNA by methylating these same sites. Methylation means adding chemical marks that keep the restriction enzyme from cutting the host genome. In some bacteria, one enzyme can both cut DNA and add methyl groups when it has the same sequence specificity.

EcoRI is a well-known example. It acts as a restriction enzyme when it is a dimer made of identical subunits. When it is a monomer, it acts as a methylase. Other bacteria use two separate enzymes to perform cutting and methylation. This restriction and modification system helps protect bacterial DNA from viral attack.

Each restriction enzyme comes from a particular bacterial species and has its own DNA target site. The enzyme name reflects its source, such as EcoRI from the E. coli strain RY13. When DNA is cut with a specific restriction enzyme, the fragments have the same sequence at their 5' and 3' ends. If a plasmid DNA and an insert are cut with the same enzyme, their ends match and can be ligated easily. The fragments are then often checked on an agarose gel to see whether the DNA length matches the expected size.

DNA Cutting Sites and Bacterial Defense

recombinant dna

Recombinant DNA and Gene Cloning

Recombinant DNA and gene cloning are tools used to combine DNA from different sources. Scientists use them to isolate a gene, join it to a carrier DNA molecule, and make copies of that DNA. A plasmid is one common carrier used in this process. A plasmid is a small ring of DNA found in bacteria, and it can carry the inserted gene into a host cell. Once inside the cell, the recombinant DNA can be copied as the cell grows. This approach is important in biotechnology and genetic research. It...

dna isolation

Genomic DNA Extraction Methods

Genomic DNA extraction methods separate DNA from proteins, RNA, and other cell material. The process usually follows four main steps. First, the cell structure is disrupted with mechanical or chemical methods to make a cell lysate. Then the DNA is protected from damage during processing. After that, the soluble DNA is separated from cell debris. Finally, the purified DNA is eluted, or washed out, for later use. DNA isolation can follow two main approaches: solution-based methods or solid-phase...

dna agarose gel electrophoresis

Purifying DNA Bands from Agarose Gels

Agarose gel electrophoresis can be used to purify DNA bands after separation by size. In gel extraction, the DNA fragment of interest is cut from the gel and cleaned before later use. This is especially useful in cloning, where pure DNA is needed before ligation, the joining step that links DNA pieces together. In cloning experiments, both the insert and vector DNA fragments are first cut with restriction endonucleases. These fragments often contain enzymes, salts, and other contaminants. Such...

labeling dna probes

DNA Probe Labels for Detecting Targets

DNA probes are short DNA fragments with a reporter tag attached so they can be detected or purified. They bind to matching nucleic acid sequences by complementary base-pairing. That binding helps researchers recover or identify specific regions of DNA. Several reporter tags are commonly used to label DNA probes. These include radioisotopes, fluorophores, and small molecule binding partners such as biotin or digoxigenin. The label choice depends on the probe’s intended use and on the source of...

southern blot

Southern Blot for DNA Detection

Southern blotting is a DNA detection method used after agarose gel electrophoresis separates DNA fragments by size. A DNA ladder with fragments of known length is run beside the sample so the fragment size can be estimated. The blot adds another step when scientists need to confirm the sequence identity of the DNA. First, the target DNA is cut into smaller pieces with a restriction endonuclease and run on an agarose gel. The DNA is then denatured, which means the double strands are separated...

dna microarrays

Gene Chips for Comparing Cell Activity

DNA microarrays are gene chips used to compare gene activity in different conditions. They are high-throughput assays, which means they can analyze large amounts of data at once. They are also relatively inexpensive and can be automated, making them useful for genome-wide studies. These chips are built on glass or silica slides. Probe molecules are covalently attached to the surface through surface functionalization. In many cases, the slides are prepared by chemisorption of silanes to silica...

complementary dna

Making cDNA from RNA Templates

Complementary DNA, or cDNA, is made from an RNA template. It is a DNA copy of RNA, so it can help students study gene expression in a lab setting. cDNA is useful when scientists want to work with genes after they have been turned on in a cell. Because it is copied from RNA, it reflects which genes were active at the time the RNA was collected. This process links RNA and DNA in a simple way. It also gives students a clear view of how genetic information can be copied for analysis.

fish - fluorescent in-situ hybridization

FISH for Chromosome and Pathogen Detection

FISH is a DNA and RNA detection method used in cytogenetics and medical testing. FISH stands for fluorescence in situ hybridization. It uses labeled probes that bind to complementary DNA or RNA sequences on a chromosome or inside a cell. The method was developed in the early 1980s and became widely used because it can show specific genetic targets with high detail. In the past, probes were made by cloning or by reverse transcription of a DNA template. Today, probe oligonucleotides can also be...

pcr - polymerase chain reaction

PCR: DNA Amplification for Genetics Labs

PCR is a DNA amplification method used in genetics labs. PCR stands for polymerase chain reaction. It copies a specific DNA segment so scientists can study small amounts of genetic material. The process uses repeated heating and cooling steps. These steps let the DNA strands separate, primers bind to the target region, and a DNA polymerase build new strands. With each cycle, the target DNA can increase in amount. PCR is a core technique in molecular biology and many school-level biology...

real time rt-pcr

Real-Time RT-PCR for Gene Expression Tracking

Real-time RT-PCR tracks gene expression by measuring how much target DNA is made during PCR. It starts with mRNA, which is converted into complementary DNA, or cDNA, by an enzyme called reverse transcriptase. The cDNA is then amplified by PCR so the target sequence can be measured. This method can be done in one tube as a single-step reaction or in two separate steps. During amplification, the amount of product is followed in real time with fluorescent dyes or sequence-specific probes linked...

race - rapid amplification of cdna ends

Finding cDNA Ends with RACE PCR

Rapid Amplification of cDNA Ends, or RACE, helps scientists capture the full-length cDNA from an mRNA sequence. It works by linking a known internal region to the unknown sequence at either the 5' end or the 3' end. The method is widely used when the missing end of a gene needs to be identified. RACE uses a gene-specific primer that binds to the known cDNA region. A hybrid primer then adds a set anchor sequence to the unknown end of the cDNA. After that, PCR amplifies the DNA segment between...

sanger sequencing

How Sanger Sequencing Reads DNA Fragments

Sanger sequencing reads DNA fragments by separating pieces of different lengths and decoding the order of bases. It is a key method in biology and is often used to study a cloned DNA fragment, a gene mutation, or even much larger genomes. Fredrick Sanger and his collaborators developed the chain-termination method in 1977. The method works by producing a mixture of DNA fragments with variable sizes. These fragments are then separated by capillary gel electrophoresis, which sorts them by length.

next-generation sequencing

DNA Sequencing Methods and Uses

DNA sequencing methods can read millions of DNA fragments at the same time. Next-generation sequencing made this process much faster and much less expensive than older methods. The first human genome project cost $2.7 billion and took 15 years. It was completed in 2003 after major international cooperation among research teams and funding agencies. To prepare DNA for next-generation sequencing, pure genomic DNA is first broken into smaller pieces. These pieces are used to build a sequencing...

rna-seq

RNA-Seq Workflow and Data Analysis

RNA sequencing, or RNA-Seq, is a high-throughput method for studying the transcriptome of a cell. The transcriptome is the full set of RNA molecules in a sample. Transcriptomics helps scientists understand how genomes work, how organisms develop, and how some diseases occur. Before RNA-Seq, researchers often used microarray methods and Sanger sequencing to study RNA. Microarrays had limited coverage and depended on already knowing the genome sequence. Sanger sequencing was low-throughput,...

genome annotation and assembly

How Genome Assemblies Are Updated

Genome assembly and genome annotation are key steps in genome analysis. Genome assembly puts DNA sequencing data back in the correct order to make a close copy of the original genome. Genome annotation then identifies functional parts on that assembled genome. Assembling a genome is not simple. In human populations, gene copy number can vary, and repeated DNA sequences can make the process harder. Even so, the physical location of human genes stays constant. Bacterial genomes can be more...

restriction enzymes

Restriction enzymes are bacterial proteins that cut DNA at specific sequence sites. They recognize palindromic DNA sequences, also called inverted repeats, and cut the DNA in a sequence-specific way. These sites are often found in regions with important functions, such as the origin of replication, gene operator sites, and transcription termination signals. Bacteria protect their own DNA by methylating these same sites. Methylation means adding chemical marks that keep the restriction enzyme...

maxam-gilbert sequencing

Chemical Cleavage DNA Sequencing

Chemical cleavage DNA sequencing uses specific chemicals to cut DNA at known sites. Allan Maxam and Walter Gilbert described this method in the same year that the Sanger sequencing method was discovered. It reads the DNA sequence by breaking purified DNA into fragments and then studying the fragment pattern. The method depends on chemicals that cleave DNA at specific bases. The resulting fragments are separated by electrophoresis, which is a way to sort DNA pieces by size using an electric...

key terms and concepts

Learn how restriction enzymes recognize palindromic DNA sites, protect bacterial genomes by methylation, and help join DNA fragments for cloning.

DNA Cutting Sites and Bacterial Defense | JoVE K12

molecular biology

JoVE Core Molecular Biology veranschaulicht die molekularen Prozesse der Zelle in prägnanten animierten Video-Lektionen. In Videos von Wissenschaftlern in Aktion wird die Anwendung dieser Konzepte zusätzlich durch reale Experimente in modernen Laboren demonstriert.

Tennessee Academic Standards

High School

links-among-engineering-technology-science-and-society

Links Among Engineering, Technology, Science, and Society

BIO1.ETS2.1

Florida Department of Education

Life Science

SC.912.L.16

SC.912.L.16.12

Texas Essential Knowledge and Skills

BIO.7

BIO.7.D

What is Meiosis?

Meiosis is the process by which diploid cells divide to produce haploid daughter cells. In humans, each diploid cell contains 46 chromosomes, half from ...

Meiosis I

Meiosis II

Meiosis vs. Mitosis

Crossing Over

Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to ...

Nondisjunction

Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This ...

Spermatogenesis

Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of ...

Oogenesis

In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from ...

Fertilization

During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ...

Cleavage and Blastulation

After a large-single-celled zygote is produced via fertilization, the process of cleavage occurs while zygotes travel through the uterine tube. Cleavage ...

Gastrulation

Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of ...

Neurulation

Neurulation is the embryological process which forms the precursors of the central nervous system and occurs after gastrulation has established the three ...

Cell Migration

Cell migration, the process by which cells move from one location to another, is essential for the proper development and viability of organisms ...

Determination

During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. ...

Use models to explain how DNA is passed from parents to offspring through the processes of meiosis and fertilization in sexual reproduction.

LS.Bio.6.1

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations ...

genome-size-and-the-evolution-of-new-genes

Genome Size and the Evolution of New Genes

types-of-genetic-transfer-between-organisms

Types of Genetic Transfer Between Organisms

Base-pairing and DNA Repair

The DNA Replication Fork

Lagging Strand Synthesis

The Replisome

Proofreading

Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template ...

Replication in Prokaryotes

DNA replication has three main steps: initiation, elongation, and termination. Replication in prokaryotes begins when initiator proteins bind to the ...

Replication in Eukaryotes

In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before ...

Overview of DNA Repair

Base Excision Repair

Nucleotide Excision Repair

DNA Distortion and Damage
Cells are regularly exposed to mutagens&#8212;factors in the environment that can damage DNA and generate mutations. UV ...

Mismatch Repair

Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the ...

Fixing Double-strand Breaks

Homologous Recombination

Gene Conversion

Restarting Stalled Replication Forks

Construct an explanation to summarize how inheritable genetic variations may result from: new genetic combinations in meiosis, mutations during replication, or mutations caused by environmental factors.

LS.Bio.6.2

An Overview of Genetic Analysis

An organism&#8217;s physical traits, or phenotype, are a product of its genotype, which is the combination of alleles (gene variants) inherited from its ...

Genetic Crosses

To dissect genetic processes or create organisms with novel suites of traits, scientists can perform genetic crosses, or the purposeful mating of two ...

Punnett Squares

Monohybrid Crosses

Dihybrid Crosses

Trihybrid Crosses

Trihybrid Crosses
Some of Mendel&#8217;s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A ...

Law of Independent Assortment

Chi-square Analysis

The chi-square test is a statistical hypothesis test. It is used to check whether there is a significant difference between an expected value and an ...

Pedigree Analysis

Multiple Allele Traits

Incomplete Dominance

Gregor Mendel&#39;s work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid ...

Lethal Alleles

Agouti: A Lethal Allele
Lucien Cu&#233;not discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is ...

Polygenic Traits

background-and-environment-affect-phenotype

Background and Environment Affect Phenotype

Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as ...

Use mathematics and computational thinking to predict the variation and distribution of expressed traits based on: Mendelian inheritance, co-dominance, incomplete dominance, multiple alleles, and sex-linked inheritance.

LS.Bio.7.1

Overview

A pedigree is a diagram displaying a family&#x2019;s history of a trait. Analyzing pedigrees can reveal (1) whether a trait is dominant or ...

Probability Laws

Overview

The probability of inheriting a trait can be calculated using the sum and product rules. The sum rule is used to calculate the probability of ...

The Concept of Multiple Allelism

Multiple allelism describes genes that exist in three or more allelic forms. Although diploid organisms, like humans, ...

Analyze and interpret data to explain how polygenic traits result in a wide range of phenotypes.

LS.Bio.7.2

Pleiotropy

Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause ...

Nature and Nurture

Many human characteristics, like height, are shaped by both nature&mdash;in other words, by our genes&mdash;and by nurture, or our environment. For ...

Construct an explanation to summarize how traits result from interactions of genetic factors (multiple genes and/or alleles) and environmental factors.

LS.Bio.7.3

PCR: The Polymerase Chain Reaction

The polymerase chain reaction, or PCR, is a technique used to amplify DNA through thermocycling &#8211; cyles of temperature changes at fixed time ...

DNA Gel Electrophoresis

DNA gel electrophoresis is a technique used for the detection and separation of DNA molecules. An electric field is applied to a gel matrix comprised of ...

DNA Isolation

DNA isolation protocols can be fast and straightforward or complex and time-consuming depending on the type and quality of DNA required for further ...

Restriction enzymes are bacterial enzymes used to cut DNA in a sequence-specific manner. To cleave DNA, they bind to specific palindromic sequences called ...

DNA Agarose Gel Electrophoresis

Agarose gel electrophoresis is a laboratory technique commonly used to separate DNA fragments by size. However, it can also be used to isolate and purify ...

dna-isolation-and-restriction-enzyme-analysis

DNA Isolation and Restriction Enzyme Analysis

The revelation of DNA as the hereditary molecule in all organisms has led to enormous scientific and medical breakthroughs and significantly enhanced our ...

Preparation of Solutions and Materials
ExpandNOTE: For this lab to run smoothly, it is recommended to not exceed 12 samples per laboratory class.
First ...

DNA Isolation
ExpandNOTE: In this experiment you will perform DNA isolation under two experimental conditions: one using a buffer containing the detergent ...

Analyze and interpret data to compare DNA samples.

Understand genetic mechanisms for variation.

DNA Cutting Sites and Bacterial Defense

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