DNA replication is the process by which DNA copies itself to produce identical daughter molecules. It occurs through a semi-conservative process in both prokaryotes and eukaryotes. In eukaryotes, replication is a complex multi-stage process involving initiation, formation of a pre-replication complex, conversion to an initiation complex, elongation via leading and lagging strand synthesis, and termination. Key proteins involved include ORC, Cdc6, Cdt1, MCM complexes, Cdc45, GINS, DNA polymerases, primase, ligase and topoisomerases. Replication occurs with high fidelity and is tightly regulated to prevent re-replication.
DNA Replication In Eukaryotes (Bsc.Zoology)DebaPrakash2
This Slide Is explanation of Mechanism of DNA Replication In Eukaryotes.
As we know we all have DNA as the genetic material and So we should know how this DNA getting Duplicated so that it'll pass to daughter cells.
An Overview...
Definition of Translation.
Def. of Eukaryotes.
Translation: An Overview.
Components of Translation.
Some Enzymes .
Ribosome Role.
Mechanism of Translation.
Initiation.
Scanning Model of Initiation.
Initiation Factors.
Animation.
Elongation.
Chain Elongation: Translocation.
Animation.
Termination.
Animation....
It's not perfect still... what are your views friends?
DNA Replication In Eukaryotes (Bsc.Zoology)DebaPrakash2
This Slide Is explanation of Mechanism of DNA Replication In Eukaryotes.
As we know we all have DNA as the genetic material and So we should know how this DNA getting Duplicated so that it'll pass to daughter cells.
An Overview...
Definition of Translation.
Def. of Eukaryotes.
Translation: An Overview.
Components of Translation.
Some Enzymes .
Ribosome Role.
Mechanism of Translation.
Initiation.
Scanning Model of Initiation.
Initiation Factors.
Animation.
Elongation.
Chain Elongation: Translocation.
Animation.
Termination.
Animation....
It's not perfect still... what are your views friends?
RNA Polymerase
Introduction
Purification
History
PRODUCTS OF RNAP
Messenger RNA
Non-coding RNA or "RNA genes
Transfer RNA
Ribosomal RNA
Micro RNA
Catalytic RNA (Ribozyme)
prokaryotic and eukaryotic
Transcription by RNA Polymerase
TYPES OF RNA POLYMERASE
Type I
Type II
Type III
Prokaryotic Transcription Unit
EXPRESSION OF A PROKARYOTIC GENE
Prokaryotic Polycistronic Message Codes for Several Different Proteins
Eukaryotic Transcription Unit
ENHANCERS AND SILENCERS
RESULT OF THE TRANSCRIPTION CYCLE
RNAP III TRANSCRIBES HUMAN MICRORNAS
RNAP I–specific subunits promotepolymerase clustering to enhance the rRNA genetranscription cycle
RNAP II–TFIIB STRUCTURE ANDMECHANISM OF TRANSCRIPTION INITIATION
FIVE CHECKPOINTS MAINTAINING THE FIDELITY OFTRANSCRIPTION BY RNAP IN STRUCTURAL ANDENERGETIC DETAILS
Prokaryotic and eukaryotic transcription with their clinical applicationsrohini sane
A comprehensive presentation on Prokaryotic and Eukaryotic DNA transcription with their clinical applications for Medical, dental, Pharma & Biotechnology students to facilitate self- study.
Replication Introduction , DNA replicating Models , Meselson and Stahl Experiments , Circuler Model of DNA replication , Replication in Prokaryotes , Replication In Eukaryotes , Comparison Between Prokaryotes and Eukaryotes Replicaton and PCR (Polymerease Chain Reaction)
it describes transcription with simple diagram and animation. its steps and inhibitors are described for both eukaryotes and prokaryotes. it will be easily understood by UG students . post transcriptional modification of all the RNA are also described with diagrams.
This presentation is all about the different shapes in bacteria. This can help you in determining shapes that you do in your experiments in Microbiology. Hope this can help. :-)
RNA Polymerase
Introduction
Purification
History
PRODUCTS OF RNAP
Messenger RNA
Non-coding RNA or "RNA genes
Transfer RNA
Ribosomal RNA
Micro RNA
Catalytic RNA (Ribozyme)
prokaryotic and eukaryotic
Transcription by RNA Polymerase
TYPES OF RNA POLYMERASE
Type I
Type II
Type III
Prokaryotic Transcription Unit
EXPRESSION OF A PROKARYOTIC GENE
Prokaryotic Polycistronic Message Codes for Several Different Proteins
Eukaryotic Transcription Unit
ENHANCERS AND SILENCERS
RESULT OF THE TRANSCRIPTION CYCLE
RNAP III TRANSCRIBES HUMAN MICRORNAS
RNAP I–specific subunits promotepolymerase clustering to enhance the rRNA genetranscription cycle
RNAP II–TFIIB STRUCTURE ANDMECHANISM OF TRANSCRIPTION INITIATION
FIVE CHECKPOINTS MAINTAINING THE FIDELITY OFTRANSCRIPTION BY RNAP IN STRUCTURAL ANDENERGETIC DETAILS
Prokaryotic and eukaryotic transcription with their clinical applicationsrohini sane
A comprehensive presentation on Prokaryotic and Eukaryotic DNA transcription with their clinical applications for Medical, dental, Pharma & Biotechnology students to facilitate self- study.
Replication Introduction , DNA replicating Models , Meselson and Stahl Experiments , Circuler Model of DNA replication , Replication in Prokaryotes , Replication In Eukaryotes , Comparison Between Prokaryotes and Eukaryotes Replicaton and PCR (Polymerease Chain Reaction)
it describes transcription with simple diagram and animation. its steps and inhibitors are described for both eukaryotes and prokaryotes. it will be easily understood by UG students . post transcriptional modification of all the RNA are also described with diagrams.
This presentation is all about the different shapes in bacteria. This can help you in determining shapes that you do in your experiments in Microbiology. Hope this can help. :-)
“This structure has novel features which are of considerable biological interest.”
This may be the science most famous statement, which appeared in April 1953 in the scientific paper where James Watson and Francis Crick presented the structure of the DNA-helix.
“It has not escaped our notice that the specific pairing we have postulated immediately suggests a possible copying mechanism for the genetic material."
Replication:
DNA replication is the biological process of producing two identical copies of DNA from the original/parentral DNA molecule.
This process occurs in all living organism.
Basis for biological inheritance
DNA Replication Is Semiconservative
Replication Begins at an Origin and Usually Proceeds Bidirectionally
DNA Synthesis Proceeds in a 5’-3’ Direction and Is semidiscontinuous
Stages of cell cycleFlow Cytometry Measurement of Cellular DNA Co.pdfreyazansari001
Stages of cell cycle:
Flow Cytometry Measurement of Cellular DNA Content
The nuclear DNA content of a cell can be quantitatively measured at high speed by flow
cytometry. Initially, a fluorescent dye that binds stoichiometrically to the DNA is added to a
suspension of permeabilized single cells or nuclei. The principle is that the stained material has
incorporated an amount of dye proportional to the amount of DNA. The stained material is then
measured in the flow cytometer and the emitted fluorescent signal yields an electronic pulse with
a height (amplitude) proportional to the total fluorescence emission from the cell. Thereafter,
such fluorescence data are considered a measurement of the cellular DNA content. Samples
should be analyzed at rates below 1000 cells per second in order to yield a good signal of
discrimination between singlets or doublets. Since the data obtained is not a direct measure of
cellular DNA content, reference cells with various amounts of DNA should be included in order
to identify the position of the cells with the normal diploid amount of DNA. Some of the
common reference cells often used for DNA measurements are human leukocytes or red blood
cells from chicken and trout. Commonly DNA measurements are expressed as a DNA index of
the ratio of sample DNA peak channel to reference DNA peak channel.
The Analysis of the Cell Cycle
In addition to determining the relative cellular DNA content, flow cytometry also enables the
identification of the cell distribution during the various phases of the cell cycle. Four distinct
phases could be recognized in a proliferating cell population: the G1-, S- (DNA synthesis phase),
G2- and M-phase (mitosis). However, G2- and M-phase, which both have an identical DNA
content could not be discriminated based on their differences in DNA content. Diverse software
containing mathematical models that fit the DNA histogram of a singlet have been developed in
order to calculate the percentages of cells occupying the different phases of the cell cycle.
Regulations of CDK activity:
What Are Cyclin-Dependent Kinases?
Of the many proteins involved in cell cycle control, cyclin-dependent kinases (CDKs) are among
the most important. CDKs are a family of multifunctional enzymes that can modify various
protein substrates involved in cell cycle progression. Specifically, CDKs phosphorylate their
substrates by transferring phosphate groups from ATP to specific stretches of amino acids in the
substrates. Different types of eukaryotic cells contain different types and numbers of CDKs. For
example, yeast have only a single CDK, whereas vertebrates have four different ones.
As their name suggests, CDKs require the presence of cyclins to become active. Cyclins are a
family of proteins that have no enzymatic activity of their own but activate CDKs by binding to
them. CDKs must also be in a particular phosphorylation state — with some sites phosphorylated
and others dephosphorylated — in order for activation .
How to Create Map Views in the Odoo 17 ERPCeline George
The map views are useful for providing a geographical representation of data. They allow users to visualize and analyze the data in a more intuitive manner.
The Art Pastor's Guide to Sabbath | Steve ThomasonSteve Thomason
What is the purpose of the Sabbath Law in the Torah. It is interesting to compare how the context of the law shifts from Exodus to Deuteronomy. Who gets to rest, and why?
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
For more information, visit-www.vavaclasses.com
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
Impact of Ethnobotany in traditional medicine,
New development in herbals,
Bio-prospecting tools for drug discovery,
Role of Ethnopharmacology in drug evaluation,
Reverse Pharmacology.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
2. REPLICATION
It is a process in which the DNA copies itself to
produce identical daughter molecules of DNA.
It occurs only once in each cell.
It occurs very quick, accurate and at correct
time.
Replication of DNA occurs based on the
Chargaff’s Rule that is
Cytosine – Guanine ( 3 H bonds)
Adenine – Thymine (2 H bonds)
3. Modes of Replication
Delbruck suggest that Watson-Crick model of DNA
could theoretically be replicated by three modes
Conservative
Semi-conservative
dispersive
4.
5. Simple Process
G1
•Replication initiated
S
•DNA synthesis occur
•Two daughter copies
are produced
G2
•Repair mechanisms
occur
Finally, one copy of the genomes is
segregated to each daughter cell at mitosis
or M phase.
These daughter copies each contain one
strand from the parental duplex DNA and
one nascent anti-parallel strand.
This process is conserved from
prokaryotes to eukaryotes and the
mechanism is called semi-conservative
mode of replication.
6. ComplexProcess
DNA replication in eukaryotes divided into three stages
1. Initiation ( Formation of Pre – Replicative
Complex)
2. Initiation complex
3. Elongation (Replication fork and Polymerization)
4. Termination
7. Initiation of Replication
It is the first step in eukaryotic replication in which most
of the proteins combines to form Pre – Replicative
complex (Pre-RC).
Involved proteins
Origin Recognition complex (ORC)
Cell division cycle 6( Cdc 6)
Chromatin licensing and DNA Replication factor 1( Cdt 1)
Minichromosome Maintenance Protein Complex (Mcm 2-
7)
8. Steps in initiation
ORC binds in the
Ori-c Site of the
DNA
Recruits the Cdc 6
Cdc 6 Binds with
ORC in ATP
dependent manner
Cdc 6 recruits the
Cdt 1
Cdt 1 is required for
licensing the
chromatin for
Replication
Cdt 1 binds with C
terminus of Cdc 6
Finally binding all
three protein recruit
Mcm
Mcm finally binds
with Chromatin
These following
steps occur in G1
phase of cell cycle
9.
10. The activity of Cdt 1 during the cell cycle is regulated by a
protein called Geminin.
It also inhibits Cdt 1 activity during the S phase in order to
prevent the re-replication of DNA, Ubiquitination and
proteolysis.
11. Functions of Mcm Complex
Minichromosome Maintenance Complex has helicase
activity and inactivation of any of the six protein will
prevent the progress of formation of replication fork.
It also has ATPase activity. A mutation at any one of the
Mcm protein complex will reduce conserved ATP
binding site.
Mcm complex is a hexamer with Mcm 3, Mcm 7, Mcm
2, Mcm 6, Mcm 4, Mcm 5.
12. Initiation Complex
It is the 2nd stage in DNA replication where the Pre –
Replicative complex is converted into Initiation complex.
Involved proteins
Cell Division Cycle 45 ( Cdc 45)
GINS
Cyclin Dependent Kinase ( CDK)
Dbf 4 Dependent Kinase (DDK) – Combination of Cdc 7
and dbf 4
13. Steps in initiation complex
Cdc 45 protein is a compound which is need for the
conversion of Pre – RC into initiation complex.
Its binds with chromatin after the beginning of initiation
in late G1 phase by physically associated with Mcm 5.
The binding of Cdc 45 is based on Clb - Cdc 28 as well as
the function of Cdc 6 and Mcm.
GINS are essential for interaction of Mcm and Cdc 45 at
Ori-c site during initiation.
14. GINS complex is composed of four small proteins namely
Sld5 (Cdc105)
Psf1 (Cdc101)
Psf2 (Cdc102)
Psf3 (Cdc103)
GINS represents 'go, ichi, ni, san' which means '5, 1, 2, 3' in
Japanese.
15. At the onset of S phase, the pre-replicative complex must be
activated by two S phase-specific kinases in order to form an
initiation complex at an origin of replication.
One kinase is the Cdc7-Dbf4 kinase called Dbf4-dependent
kinase (DDK) and the other is cyclin-dependent kinase (CDK).
The CDK-dependent phosphorylation of Cdc6 has been
considered to be required for entry into the S phase.
DDK targets the Mcm complex, and its phosphorylation leads
to the possible activation of Mcm helicase activity.
16. Elongation
Once the initiation complex is formed and the cells pass
into the S phase, the complex then becomes a replisome
and elongation is initiated.
Once the elongation is initiated, it form the replication
fork by unwinding the DNA strand.
As the double helix of DNA separates from one side and
super coils are formed on the other side.
The problem of super coils comes in the way of DNA
replication is solved by a group of enzymes called DNA
topoisomerase.
17. Replication Fork
The replication fork is the junction the between the
newly separated template strands, known as the leading
and lagging strands, and the double stranded DNA.
Elongation occur in 5’ to 3’ direction in both the leading
and lagging strand.
18.
19. Leading Strand
The leading strand is the template strand that is being
replicated in the same direction as the movement of the
replication fork.
Nucleotides are added by the DNA Polymerase ε.
DNA polymerase requires the RNA primer produced by
Primase.
Elongation take place in 5’ to 3’ direction.
Finally the primer are removed by RNAse H and the gap
is sealed by the DNA Ligase 1.
20. Lagging Strand
DNA replication on lagging strand is discontinuous and
elongation opposite direction to replication fork.
Nucleotide are added by the DNA Polymerase δ.
Lagging strand used more RNA Primer for loading
nucleotide.
DNA polymerase will synthesize short fragments of DNA
called Okazaki fragments which are added to the 3' end
of the primer. These fragments can be anywhere between
100-400 nucleotides long in eukaryotes.
21. Step 1 = Binding
Step 3 = Translocation
The binding-
polymerization-
translocation cycle can
occurs many times
This greatly lengthens
one of the strands
The complementary
strand is made by primase,
DNA polymerase and ligase
RNA primer
Step 2 = Polymerization