This document summarizes the process of fatty acid oxidation. It occurs in three stages: 1) beta-oxidation in the mitochondria breaks down fatty acids into acetyl-CoA units, producing NADH and FADH2. 2) The acetyl-CoA enters the citric acid cycle. 3) Electrons from NADH and FADH2 are used to power ATP synthesis via oxidative phosphorylation. Fatty acids are activated to fatty acyl-CoAs before beta-oxidation. Saturated, monounsaturated, and polyunsaturated fatty acids undergo this process with additional enzyme steps for unsaturated fatty acids. Beta-oxidation removes two carbons as acetyl-CoA in four enzyme
Pentose phosphate pathway is also called Hexose monophosphate pathway/ HMP shunt/ Phosphogluconate pathway.
It is an alternative route for the metabolism of glucose.
It is more complex pathway than glycolysis.
It is more anabolic in nature.
It takesplace in cytosol.
The tissues such as liver, adipose tissue, adrenal gland, erythrocytes,testes and lactating mammary gland are highly active in HMP shunt.
It concern with the biosynthesis of NADPH and pentoses.
Pentose phosphate pathway is also called Hexose monophosphate pathway/ HMP shunt/ Phosphogluconate pathway.
It is an alternative route for the metabolism of glucose.
It is more complex pathway than glycolysis.
It is more anabolic in nature.
It takesplace in cytosol.
The tissues such as liver, adipose tissue, adrenal gland, erythrocytes,testes and lactating mammary gland are highly active in HMP shunt.
It concern with the biosynthesis of NADPH and pentoses.
ATP synthase—also called FoF1 ATPase is the universal protein that terminates oxidative phosphorylation by synthesizing ATP from ADP and phosphate.
ATP Synthase is one of the most important enzymes found in the mitochondria of cells
Free fatty acids also called unesterified (UFA) or nonesterified (NEFA) fatty acids are fatty acids that are in the unesterified state.
In plasma, longer-chain FFA are combined with albumin, and in the cell they are attached to a fatty acid-binding protein.
Shorter-chain fatty acids are more watersoluble and exist as the un-ionized acid or as a fatty acid anion.
By these means, free fatty acids are made accessible as a fuel in other tissues.
ATP synthase—also called FoF1 ATPase is the universal protein that terminates oxidative phosphorylation by synthesizing ATP from ADP and phosphate.
ATP Synthase is one of the most important enzymes found in the mitochondria of cells
Free fatty acids also called unesterified (UFA) or nonesterified (NEFA) fatty acids are fatty acids that are in the unesterified state.
In plasma, longer-chain FFA are combined with albumin, and in the cell they are attached to a fatty acid-binding protein.
Shorter-chain fatty acids are more watersoluble and exist as the un-ionized acid or as a fatty acid anion.
By these means, free fatty acids are made accessible as a fuel in other tissues.
This ppt has been presented as seminar in Department of Biochemistry ,C.C.S. university, Meerut.in front of all faculty members for the detailed discussion on this topic. Hope this will help you to go through the concept in an easy manner.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
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!
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
Acetabularia Information For Class 9 .docxvaibhavrinwa19
Acetabularia acetabulum is a single-celled green alga that in its vegetative state is morphologically differentiated into a basal rhizoid and an axially elongated stalk, which bears whorls of branching hairs. The single diploid nucleus resides in the rhizoid.
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
Honest Reviews of Tim Han LMA Course Program.pptxtimhan337
Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Han’s Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insider’s LMA Course, this piece examines the course’s effects via a variety of Tim Han LMA course reviews and Success Insider comments.
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.
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?
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
2. Introduction
Fatty acids are aliphatic carboxylic acids containing a long
hydrocarbon chain.
The hydrocarbon chain may be saturated(with no double
bond) or unsaturated ( containing double bond).
Triacylglycerols(fats)are the most abundant source of
energy and provide energy twice as much as carbohydrates
and protein.
Fatty acid can be obtained from diet, adipolysis and de
novo synthesis.
3. Mitochondrial oxidation of fatty acids takes place in 3
stages-
In 1st stage β oxidation of fatty acid undergo oxidative
removal of successive 2-C units in form of acetyl Co-A.
In 2nd stage of fatty acid oxidation, the acetyl group of acetyl
co-A are oxidized to co2 in the citric acid cycle which also
takes place in the mitochondrial matrix.
The first 2 stages of fatty acid oxidation produce the reduce
electron carriers NADH and FADH2 which in 3rd stage
donate electron to mitochondrial respiratory chain, through
which the electron pass to oxygen with the concomitant
phosphorylation of ADP to ATP.
4.
5. Types of Fatty Acid
Oxidation-
Alpha oxidation- predominantly takes place in
brain and liver, one carbon is lost in the form of co2
per cycle
Beta oxidation- major mechanism, occurs in the
mitochondria matrix. 2-C units are released as acetyl
CoA per cycle.
Omega oxidation- minor mechanism, but becomes
important in condition of impaired beta oxidation.
6. Beta oxidation
overview-
A saturated acyl Co-A is degraded by recurring sequence
of 4 reaction.
4 enzyme catalyzed reaction make up the 1st stage of fatty
acid oxidation.
The fatty acid chain is shortened by 2 carbon atoms as a
result of these reaction FADH2, NADH and acetyl Co-A
are generated.
Oxidation is on the β-carbon and the chain is broken
between the α (2) and β (3) carbon atom, hence known as
β oxidation.
7.
8. Activation of Fatty Acids-
Fatty acids must first be converted to an active
intermediate before they can be catabolized.
This is the only step in the in complete degradation of
fatty acid that requires energy from ATP.
Fatty acids are activated to fatty acyl CoA in a reaction
catalyzed by acyl CoA synthase.
9. Transport of Fatty Acids into mitochondria
The inner mitochondrial membrane is not permeable to
long chain fatty acyl CoA.
The fatty acyl CoA group is transferred to carnitine which
function as a carrier, catalyzed by carnitine acyltransferase
Ι present on the outer surface of mitochondrial
membrane.
10. In the mitochondrial
matrix, the acyl group from
acyl carnitine is transferred
to CoA by the enzyme
carnitine acyltransferase ΙΙ.
11. Steps of β oxidation
Step 1-α,β
dehydrogenation of acyl
CoA
• The first step is the
removal of two hydrogen
atoms from the 2(α) and
3(β) carbon atoms,
catalyzed by acyl CoA
dehydrogenase and
requiring FAD. This result
in the formation of trans-
∆² enoyl CoA and FADH2
12. The electron removal from the fatty acyl CoA are
transferred to FAD and the reduced form of the
dehydrogenase immediately donates its electron to an
electron carrier of the mitochondrial respiratory chain, the
electron transferring flavoprotein (ETF).
The oxidation catalyzed by acyl CoA dehydrogenase is
analogous to succinate dehydrogenation in the citric acid
cycle. In both the reaction, the enzyme is bound to the
inner membrane, a double bond is introduced into a
carboxylic acid between the α and β carbon. FAD is the
electron acceptor, and electron from the reaction
ultimately enter the respiratory chain and pass to O2 with
concomitant synthesis of about 1.5 ATP molecules.
13. Step 2 hydration of
α,β unsaturated acyl
CoA
• In this step, a molecule
of water is added to the
double bond of the
trans ∆² enoyl CoA to
form the L
stereoisomer of β
hydroxyacyl-CoA. And
reaction is catalyzed by
enoyl-CoA hydratase.
14. Step 3 Oxidation of β-
hydroxyacyl-CoA
• The 3-hydroxy derivative
undergoes further
dehydrogenation on the
3-carbon catalyzed by
L(+)-3-hydroxyacyl-CoA
dehydrogenase to form
the corresponding 3-
ketoacyl-CoA compound.
In this case, NAD+ is the
coenzyme involved.
15. Step 4 Thiolysis
3-ketoacyl-CoA is spilt at
the 2,3- position by
thiolase (3-ketoacyl-CoA-
thiolase), forming acetyl-
CoA two carbons shorter
than the original acyl-
CoA molecule.
16. The acyl-CoA formed in the
cleavage reaction reenters
the oxidative pathway at
reaction 2.
Since acetyl-CoA can be
oxidized to CO2 and water
via the citric acid cycle the
complete oxidation of fatty
acids is achieved.
17. Stoichiometry of β-oxidation
The yields of NADH, FADH2 and ATP in the successive
steps of palmitocyl-CoA oxidation. Because of the
activation of palmitate to palmitoyl-CoA breaks both
phosphoanhydride bonds in ATP, the energetic cost of
activating a fatty acid is equivalent to 2ATP, and the net
gain per molecule of palmitate is 106 ATP.
The standard free-energy change for the oxidation of
palmitate to CO2 and H2O is about 9800 kJ/mol. Under
standard condition the energy recovered as the phosphate
bond energy of ATP is 106×30.5 kJ/mol=3230 kJ/mol, about
33% of the theoretical maximum.
18. Energy yield
Energy yield by the complete oxidation of one mol of
Palmitic acid-
The degradation of palmitoyl CoA (C 16-acyl CoA) requires
seven reaction cycles. In the seventh cycle, the C4-ketoacyl
CoA is thiolyzed to two molecules of acetyl CoA.
106 ATP are produced by the complete oxidation of one mol
of Palmitic acid.
19. Oxidation of Unsaturated Fatty Acid
Most of the fatty acids in the triacylglycerol and
phospholipids of animal and plants are unsaturated having
one or more double bonds. These bonds are in the cis
configuration and cannot be acted upon by enoyl-CoA
hydratase, the enzyme catalyzing the addition of H2O to
the trans double bond of the ∆²-enoyl-CoA generated
during β oxidation. Two auxillarly enzymes are needed for
β-oxidation of the common unsaturated fatty acids: an
isomerase and a reductase.
20. Oxidation of Monounsaturated Fatty Acid
Oleate is an abundant 18-carbon monounsaturated fatty
acid with a cis double bond between C-9 and C-10.
In the first step of oxidation, oleate is converted into
oleoyl-CoA and like the saturated fatty acids, enter the
mitochondrial matrix via carnitine shuttle.
Oleoyl-CoA then undergoes 3 passes through the fatty acid
oxidation cycle to yield 3 molecule of acetyl CoA and co-
enzyme A, ester of ∆³, 12-Carbon unsaturated fatty acid,
cis-∆³ dodecenoyl-CoA. This product cannot serve as a
substrate for enoyl-CoA hydratase, which acts only on
trans double bonds.
21. The auxiliary enzyme ∆³,∆²-enoyl CoA isomerase
isomerize the cis ∆³ enoyl-CoA to trans ∆²-enoyl-CoA,
which is converted by enoyl-CoA hydratase into the
corresponding L-β- hydroxyacyl CoA.
This intermediate is now acted upon by the remaining
enzymes of β-oxidation to yield acetyl-CoA and the co-
enzyme A ester of a 10-carbon saturated fatty acids
decanoyl CoA.
The latter undergoes four more passes through the
pathway to yield five more molecules of acetyl-CoA.
Altogether, 9 acetyl-CoA are produced from one molecules
of the 18-Carbon oleate.
22.
23. Oxidation of a Polyunsaturated Fatty Acid
The other auxiliary enzyme (a reductase) is required for
oxidation of polyunsaturated fatty acids- for example the
18-carbon linoleate, which has a cis-∆⁹,cis-∆¹²
configuration.
Linoleoyl-CoA undergoes three passes through the β-
oxidation sequences to yield three molecules of acetyl-CoA
and the coenzyme A ester of a 12-carbon unsaturated fatty
acid with a cis-∆³, cis ∆⁶ configuration.
This intermediate cannot be used by enzymes of β-
oxidation pathway, its double bonds are in the wrong
position and have the wrong configuration (cis, not trans).
24. However, the combined
action of enoyl-CoA
isomerase and 2,4-dienoyl-
CoA reductase allows re-
entry of the intermediate
into the β oxidation
pathway and its
degradation to 6 acetyl-
CoA. The overall result is
conversion of linoleate to 9
molecules of acetyl-CoA.
25. Alpha oxidation
α-oxidation is a process in which fatty acid are shortened
by one carbon atom.
α-oxidation was 1st observed in seeds and leaf tissues of
plant. The original substrate have been demonstrated in
the microsomes of brain and liver and tissues also.
Involves decarboxylation process for the removal of single
carbon atom at one time with the resultant production of
an odd chain fatty acids, that can be subsequently oxidized
by β-oxidation for energy production. It is strictly an
aerobic process.
The process involves hydroxylation of the α carbon with a
specific α-hydroxylase that requires fe++ and vitamin
C/FH4 as co-factor.
26. • Hydroxy fatty acids can be converted to the α-keto acid,
followed by oxidative decarboxylation resulting in the
formation of long chain fatty chain with an odd number of
carbon atoms.
The initial hydroxylation reaction is catalyzed by a
mitochondrial enzyme, monoxygenase that requires O2,
Mg²⁺, NADPH and heat stable co-factor.
Normally metabolized by an initial α-hydroxylation
followed by dehydrogenation and decarboxylation.
Whole reaction produces 3 molecule of propionyl CoA, 3
molecules of acetyl CoA, and 1 molecule of iso-butyryl
CoA.
27. Biological significance
α-oxidation is most suited for
oxidation of phytanic acid,
produced from dietary phytol.
Phytanic acid is a significant
constituent of milk lipids and
animal fats.
Enzymatic deficiency in α-
oxidation leads to Refsum’s
disease.
28. Omega oxidation
The biological oxidation of fatty acid at the ω carbon atom
was 1st reported by Verkade, who isolated from the urine,
dicarboxylic acids of same length chain those were fed in
form of triglycerides.
He proposed that certain acids were first oxidized at the ω
carbon atom and then further metabolized by β oxidation
proceeding from both ends of the dicarboxylic acids.
Minor pathway for the fatty acid oxidation also involves
hydroxylation and occur in the endoplasmic reticulum of
many tissues.
29. Hydroxylation takes place on the methyl carbon at the
other end of the molecule from the carboxyl group or on
the carbon next to the methyl end.
It uses the mixed function oxidase, type of reaction
requiring cytochrome P45o, O2 and NADPH, as well as
necessary enzymes.
Hydroxy fatty acid can be further oxidized to a dicarboxylic
acid via sequential reaction of alcohol dehydrogenase and
aldehyde dehydrogenase. The process occurs primarily
with medium chain fatty acids.
30. The dicarboxylic acids so
formed can be activated at
either end of molecule to
form a CoA ester, which can
undergo β-oxidation to
produce shorter chain
dicarboxylic acids such as
adipic acids and succinic
acid.
31. Biological significance
The microsomal (endoplasmic reticulum) pathway of
fatty acid ω-oxidation represents a minor pathway of
overall fatty acid oxidation.
In certain pathophysiological states, such as diabetes,
chronic alcohol consumption and starvation, the ω-
oxidation pathway may provide an effective means for
the elimination of toxic levels of free fatty acids.
32. Reference
David L.Nelson, Michael M.Cox. 2008. Lenninger
“Principle of Biochemistry”. W.H Freeman and
Company. Chapter-7 “Fatty Acid Catabolism”. Page
649-664.