The document summarizes key aspects of the pentose phosphate pathway (PPP). It describes the two main functions of the PPP as generating NADPH and producing ribose-5-phosphate. It also outlines the oxidative and nonoxidative branches of the PPP and explains how the pathway can operate in different modes depending on the cell's needs for NADPH, ribose-5-phosphate, or ATP. The document also discusses glucose-6-phosphate dehydrogenase deficiency and its implications.
To understand how the glycolytic pathway is converts glucose to pyruvate.
To understand conservation of chemical potential energy in the form of ATP and NADH.
To learn the intermediates, enzyme, and cofactors of the glycolytic pathway.
For More Medicine Free PPT - http://playnever.blogspot.com/
For Health benefits and medicine videos Subscribe youtube channel - https://www.youtube.com/playlist?list=PLKg-H-sMh9G01zEg4YpndngXODW2bq92w
Dr. Dhiraj J. Trivedi presenting Lecture on Carbohydrate metabolism for medical students.
Professor, SDM College of Medical Sciences, Dharwad, Karnataka, India
By the end of this lecture you will be able to:
Understand that ENERGY can be transformed from one form to another.
Know that energy exist in two forms; free energy - available for doing work or as heat - a form unavailable for doing work.
Appreciate that the Sun provides most of the energy needed for life on Earth.
Explain why photosynthesis is so important to energy and material flow for life on earth.
Know why plants tend to be green in appearance.
Equate the organelle of photosynthesis in eukaryotes with the chloroplast.
Describe the organization of the chloroplast.
Understand that photosynthesis is a two fold process composed of the light-dependent reactions (i.e., light reactions) and the light independent reactions (i.e. Calvin Cycle or Dark Reactions).
Tell where the light reactions and the CO2 fixation reactions occur in the chloroplast.
Define chlorophylls giving their basic composition and structure.
Draw the absorption spectrum of chlorophyll and compare it to the action spectrum of photosynthesis.
Define the Reaction Centers and Antennae and describe how it operates.
Describe cyclic photophosphorylation of photosynthesis.
Describe noncyclic photophosphorylation of photosynthesis.
To understand how the glycolytic pathway is converts glucose to pyruvate.
To understand conservation of chemical potential energy in the form of ATP and NADH.
To learn the intermediates, enzyme, and cofactors of the glycolytic pathway.
For More Medicine Free PPT - http://playnever.blogspot.com/
For Health benefits and medicine videos Subscribe youtube channel - https://www.youtube.com/playlist?list=PLKg-H-sMh9G01zEg4YpndngXODW2bq92w
Dr. Dhiraj J. Trivedi presenting Lecture on Carbohydrate metabolism for medical students.
Professor, SDM College of Medical Sciences, Dharwad, Karnataka, India
By the end of this lecture you will be able to:
Understand that ENERGY can be transformed from one form to another.
Know that energy exist in two forms; free energy - available for doing work or as heat - a form unavailable for doing work.
Appreciate that the Sun provides most of the energy needed for life on Earth.
Explain why photosynthesis is so important to energy and material flow for life on earth.
Know why plants tend to be green in appearance.
Equate the organelle of photosynthesis in eukaryotes with the chloroplast.
Describe the organization of the chloroplast.
Understand that photosynthesis is a two fold process composed of the light-dependent reactions (i.e., light reactions) and the light independent reactions (i.e. Calvin Cycle or Dark Reactions).
Tell where the light reactions and the CO2 fixation reactions occur in the chloroplast.
Define chlorophylls giving their basic composition and structure.
Draw the absorption spectrum of chlorophyll and compare it to the action spectrum of photosynthesis.
Define the Reaction Centers and Antennae and describe how it operates.
Describe cyclic photophosphorylation of photosynthesis.
Describe noncyclic photophosphorylation of photosynthesis.
This PPT contains HMP Shunt, Reactions of the pathway i.e. Oxidative & Non-oxidative. Glucose-6-Phosphate dehydrogenase (G6PD) deficiency, Regulation of Pathway, Significance of HMP shunt
HMP shunt pathway is a shunt pathway from glycolytic pathway. starting form glucose 6 pasphat by the action of an enzymes known as g6pd. by this pathway an important reducing substance named NADPH2 is produce which result in reducing other substances for its synthesis.
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.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Introduction to AI for Nonprofits with Tapp NetworkTechSoup
Dive into the world of AI! Experts Jon Hill and Tareq Monaur will guide you through AI's role in enhancing nonprofit websites and basic marketing strategies, making it easy to understand and apply.
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!
Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
Francesca Gottschalk from the OECD’s Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
2. Hexose Monophosphate
Pentose Phosphate Pathway
Glycolysis, TCA, and oxidative phosphorylation are
primarily concerned with the generation of ATP.
The PPP meets the need of all organisms for a source of
NADPH to use in reductive biosynthesis.
The reducing power is NADPH.
There is a fundamental distinction
NADH
NADPH
The direction of HMP depends on the supply and demand for
intermediates in the cycle…
5. Two Major Functions
1. NADPH
2. Ribose
Overall reaction:
3G-6-P + 6NADP+ 3CO2 + 2G-6-P + Glyceraldehyde-3P + 6NADPH + 6H+
It occurs in the cytosol because NADP+ is used as a hydrogen
acceptor.
There are two sequential reactions.
1. Oxidative
2. Nonoxidative
6.
7.
8.
9.
10. Oxidative and Nonoxidative Reactions
In oxidative, G-6-P undergoes dehydrogenation and
decarboxylation to give a pentose ribulose-5-P.
In nonoxidative, ribulose 5-P is converted back to
G-6-P by a series of reactions involving two
enzymes
1. Transketolase
2. Transaldolase
Dehydrogenation of G-6-P is the major biological
control of the HMP.
G-6-PD is strongly inhibited by NADPH.
26. Ribose-5-P + Xylulose-5-P Transketolase, TPP Sedoheptulane-7-P +
Glyceraldehyde-3-P
2C unit----- transferred by transketolase
This 2-C moiety is bound to TPP first then transferred.
Two products of transketolase then enter another reaction known
as transaldolation.
3C unit---- transferred by transaldolase
Sedoheptulase-7-P + Glyceraldehyde-3-P Transaldolase F-G-P +
Erythrope-4-P
27. Another transketolase reaction:
‒ X-5-P + E-4-P Transketolase G-3-P + F-6-P
‒ X-5-P serves as a donor of “active glycoaldehyde”.
Therefore, at the end of PPP:
‒ NADPH
‒ Ribose-5-P
‒ Glyce 3-P and Fructose-6-P Gly
The differences between glycolytic pathway and PPP are:
‒ NADPH
‒ CO2
‒ ATP
‒ Ribose-5-P for nucleotide synthesis
28. The PPP is much more active in adipose tissue than in
muscle.
It is important in tissues such as adipose, liver, mammary gland, and
adrenal cortex (NADPH depended synthesis of steroids).
Transketolase that is defective in TPP binding can cause
a neuropsychiatric disorder.
• Wernicke-Korsakoff Syndrome
‒ Lack of TPP in susceptible people
‒ Paralysis of eye movements
‒ Abnormal gait
‒ Decreased mental function
‒ Severely impaired memory
‒ Transketolase from patients with the Wernicke-Korsakoff
syndrome binds thiamine PP ten times less than does the
enzyme from normal persons
29. The flow of Glc-6-P depends
on the need for NADPH, ribose 5-P, and ATP
Mode 1
• Much more ribose 5-P is needed than NADPH
• It is seen in rapidly dividing cells
• The stoichiometry of mode 1 is:
5 Glc 6-P + ATP 6 ribose 5-P + ADP + H+
Mode 2
• The needs for NADPH = ribose 5-P are balanced.
• Formation of 2 NADPH and 1 Ribose 5-P
• The stoichiometry of mode 2 is:
Glc6-P + 2NADP+ + H2O ribose 5-P + 2NADPH + 2H+ CO2
30.
31.
32.
33. Continue on modes
Mode 3
• Much more NADPH than ribose 5-P is required. For example
adipose tissue requires a high level of NADPH for the synthesis of
fatty acids.
– Glc6-P is completely oxidized to CO2
– 3 reactions are active
• Oxidative phase forms 2 NADPH and 1 Ribose 5-P
• Ribose 5-P F-6-P and Glyceraldehyde 3-P
• Glc6-P is made from F-6-P and Glyceraldehyde 3-P
The sum of the mode 3 reaction is:
• (The stoichiometry of mode 3) is:
Glc6-P + 12NADP+ + 7H2O 6CO2 + 12 NADPH + 12H++ Pi
Therefore Glc6-P can be completely oxidized to CO2 with the
generation of NADPH
34.
35. Continue on modes
Mode 4
– Both NADPH and ATP are required.
– Ribose 5-P pyruvate, F-6-P and glyceraldehyde 3-P
– These enter glycolytic pathway
The stoichiometry of mode 4 is:
3 Glc6-P + 6 NAD+ + 5 Pi + 8 ADP
5 pyruvate + 3CO2 + 6 NADPH + 5 NADH + 8 ATP + 2 H2O + 8 H+
– Pyruvate can be oxidized more!
36.
37.
38. G-6-P dehydrogenase deficiency
G-6-P dehydrogenase deficiency causes a drug induced
hemolytic anemia.
An antimalarial drug primaquine was introduced in 1926.
Some patients developed severe symptoms like:
• Jaundice
• Hb decrease
• Massive destruction of red blood cells
• Death
In 1956, the basis of drug induced hemolytic anemia was
elucidated
The primary defect is a deficiency in G-6-P dehydrogenase
in red blood cells.
39. Role of NADPH in RBCs
GSSG GSH by glutathione reductase, which requires
NADPH.
GSH keeps Cys residues in hemoglobin and other RBC
proteins in the reduced state.
Normally, the ratio of the GSH/GSSG 500 in RBCs
Electrons are transferred by NADPH to FAD first on the
reductase, then to a S-S bridge between 2 Cys residues in the
enzyme subunit, and finally to GSSG.
GSH + ROOH GSSG + H2O + ROH
Cells with low GSH are more susceptible to hemolysis
because ROOH eliminated by GSH preoxidase by using
GSH as a reducing agent.
42. Cells with low GSH
Cells with low GSH are more susceptible to hemolysis
when fava beans are eaten.
In some regions where malaria is endemic (the middle
east) fava beans are a staple food.
They are known to contain two beta glycosieds
– Vicine
– Convicine
They oxidize GSH!
Individuals who eat fresh fava beans are protected to a
certain extent from malaria.
A condition known as favism results when some Glc 6-P
deficient individuals develop a severe hemolytic anemia
after ingestion of fava beans.
43.
44. More about Glc 6-P dehydrogenase deficiency
In the absence of G-6-P dehydrogenase, Hb can no longer
be maintained in the reduced form.
Hb molecules then cross-link with one another to form
aggregates called Heinz bodies on cell membranes.
Membranes damaged by the Heinz bodies and ROS
(reactive Oxygen Species) become deformed and the cell
undergos LYSIS Hemolytic anemia!
45. The light micrograph shows
RBC obtained from a person
deficient in Glc 6-P
dehydrogenase. The dark
dots represent Hb aggregates.
RBCs in such people lyse if
there is oxidative stress
(an increase in ROS)
46. Adeficiency of Glc 6-P dehydrogenase confers an
evolutionary advantage in some circumstances
11% of African-Americans have this deficiency.
This suggest that this deficiency may indeed be useful under certain
environmental conditions.
In fact, deficiency of Glc 6-P dehydrogenase protects against
malaria! How??
– In order for the parasites (Plasmodium Falciparum) to survive, GSH is
needed and products of PPP are also needed for optimal growth!!!
– Thus, Glc 6-P dehydrogenase deficiency is a mechanism of protection
against malaria, which accounts for its high frequency in malaria-
infested regions of the world.
WE SEE HERE ONCE AGAIN THE INTERPLAY OF
HEREDITY AND ENVIRONMENT IN THE PRODUCTION
OF DISEASE!