Enzymes are protein catalysts that speed up biochemical reactions without being consumed. They have specific three-dimensional structures with active sites that bind substrates and catalyze their conversion to products. There are six main enzyme classes defined by their catalyzed reaction types. Enzyme activity is affected by factors like substrate and enzyme concentration, pH, temperature, and inhibitors. Enzymes lower activation energy and use lock-and-key or induced-fit binding to catalyze reactions efficiently through transition states. Many require cofactors like vitamins and metal ions to function. Enzyme kinetics describe how rates change with conditions and inhibition mechanisms. Enzymes are essential to all living functions but some inhibitors like nerve gases are toxic.
The flux of metabolites through metabolic pathways involves
catalysis by numerous enzymes. Active control of homeostasis is achieved by the regulation of only a small number of enzymes.
Active sites of the enzyme is that point where substrate molecule bind for the chemical reaction. It is generally found on the surface of enzyme and in some enzyme it is a “Pit” like structure
The active site is a three-dimensional cleft formed by groups that come from different parts of the amino acid sequence
The active site takes up a relatively small part of the total volume of an enzyme
Active sites are clefts or crevices
Substrates are bound to enzymes by multiple weak attractions.
The specificity of binding depends on the precisely defined arrangement of atoms in an active site.
An enzyme is a substance that acts as a catalyst in living organisms, regulating the rate at which chemical reactions proceed without itself being altered in the process. The biological processes that occur within all living organisms are chemical reactions, and most are regulated by enzymes
This presentation is about the kinetics of enzyme action , the Michaelis- Menten Model and kinetics of allosteric enzyme action in a simplified language.
Vitamins as coenzymes, different forms and deficiency disorders Lovnish Thakur
Vitamins are organic compounds which are needed in small quantities to sustain life.
Get from food, because the human body either does not produce enough of them, or none at all
The pigment chlorophyll is found inside the chloroplasts, each leaf contains millions of chloroplasts. Inside each one, there are stacks of membranes that hold the chlorophyll molecules.
The flux of metabolites through metabolic pathways involves
catalysis by numerous enzymes. Active control of homeostasis is achieved by the regulation of only a small number of enzymes.
Active sites of the enzyme is that point where substrate molecule bind for the chemical reaction. It is generally found on the surface of enzyme and in some enzyme it is a “Pit” like structure
The active site is a three-dimensional cleft formed by groups that come from different parts of the amino acid sequence
The active site takes up a relatively small part of the total volume of an enzyme
Active sites are clefts or crevices
Substrates are bound to enzymes by multiple weak attractions.
The specificity of binding depends on the precisely defined arrangement of atoms in an active site.
An enzyme is a substance that acts as a catalyst in living organisms, regulating the rate at which chemical reactions proceed without itself being altered in the process. The biological processes that occur within all living organisms are chemical reactions, and most are regulated by enzymes
This presentation is about the kinetics of enzyme action , the Michaelis- Menten Model and kinetics of allosteric enzyme action in a simplified language.
Vitamins as coenzymes, different forms and deficiency disorders Lovnish Thakur
Vitamins are organic compounds which are needed in small quantities to sustain life.
Get from food, because the human body either does not produce enough of them, or none at all
The pigment chlorophyll is found inside the chloroplasts, each leaf contains millions of chloroplasts. Inside each one, there are stacks of membranes that hold the chlorophyll molecules.
Development of
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- Improved catalysts for existing reactors using new procedures calling for new equipment
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Heat transfer and mass transport
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Catalytic distillation as an example : performing a catalytic reaction within a distillation column ......
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This document will give you information about catalysis and type of catalysis like homogenious and heterogenious catalysis and its various application .
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Enzymes are dynamic proteins that accelerate biochemical reactions.
Each enzyme acts on a specific reactant, the substrate.
Enzymes are characterized by greater activity, specificity and susceptibility to the influence of pH, temperature and other environmental changes.
Enzymes act in the presence of non-peptide cofactors or coenzymes.
An enzyme lacking its cofactor is called apoenzyme and the active enzyme with its co-factor, the holoenzyme.
Lingzhi is a mushroom. Its botanical name is Ganoderma. The Japanese calls it Reishi.
It’s a functional food, not medicine. Read more about Lingzhi, benefits, and frequently asked questions.
This slide made by Leona Chin, you may use it to gain more info about Lingzhi. We learn and we share. Do your part and share this useful information to others so that they know how good Lingzhi really is. I hope it will help you in your business and knowledge. All the best in Shuang Hor Business. Go Diamond!
It covers enzyme kinetics, classification of enzymes, catalysis, types of catalysis, nomenclature of enzymes, apoenzymes, cofactors, isoenzymes, holoenzyme, factors affecting the rate of chemical reaction, clinical importance of enzymes. It is useful for the students of life sciences and biochemistry as well. The slides help even the teachers teaching basics of enzyme kinetics at the UG and PG levels.
Catalysts are something that speeds up the chemical reaction. Almost all biochemical reactions require catalysts.
Enzymes are biocatalysts. Biochemical catalysts speed up the biochemical reactions.
In presence of an enzyme, less energy is required for the reaction to take place.
A catalyst may be defined as a substance that increases the velocity or rate of chemical reactions without itself undergoing any change in the overall process.
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Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
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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!
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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.
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3. The Definition and Characteristics of Enzymes
• Enzymes are catalysts that increase the rate of a
reaction without being changed themselves.
• Characters:
a protein
Catalyst
effects rate of reaction and not the equilibrium
unchanged at the end of reaction
effective in smaller quantities
efficient and specific
reaction can be reversed
activities affected by surroundings
may need helpers – cofactors/coenzymes
involve in multiple steps of biochemical pathways
4. Classification of enzymes
6 main classes according to International
Union of Biochemistry and Molecular
Biology (IUBMB):
1. Oxidoreductase
2. Transferase
3. hydrolase
4. lyase
5. isomerase
6. ligase
5. Function: catalyzes oxidation-reduction reactions
(transfer of electrons)
e.g. alcohol dehydrogenase
Other e.g. Biliverdin reductase; Glucose oxidase
1.OXIDOREDACTASES1.OXIDOREDACTASES
6. Function: catalyzes reactions involving
transfer of functional groups
e.g. Hexokinase
Other e.g. Glycoaldehyde transferase; DNA
nucleotidylexotransferase
2.TRANSFERASES2.TRANSFERASES
7. Function: catalyzes hydrolytic reactions
involving use of water mol.
e.g. Triacylglycerol lipase
Other e.g. -amino acid esterase;
Oxaloacetase; trypsin
H2O
3. HYDROLASES3. HYDROLASES
8. Function: catalyzes cleavage of C-C, C-O, C-
N and other bonds by other means than by
hydrolysis or oxidation.
e.g. Lysine decarboxylase
other e.g.: threonine aldolase [EC 4.1.2.5];
Other e.g. cystine lyase, pyruvate
decarboxylase
4. LYASES4. LYASES
9. Function: catalyzes intramolecular transfer of
groups
e.g. Maleate isomerase
Other e.g. Inositol-3-phosphate synthase;
Maltose epimerase]
5. ISOMERASES5. ISOMERASES
10. Function: catalyzes the joining of two molecules with
concomitant hydrolysis of the diphosphate bond in
ATP or a similar triphosphate
e.g. Pyruvate carboxylase
Other e.g. GMP synthase; DNA ligase
6. LIGASES6. LIGASES
11. Enzymes are protein and all proteins are not
enzyme
exhibits characteristics like other proteins
primary structure
amino acid sequence
e.g.: human pancreatic lipase (467 amino acids)
N-Met1-…-Ser171-...-Asp194-...-His281-…-Cys467-C
human trypsin (247 amino acids)
N-Met1-…-His63-…-Asp107-…-Ser200-…-Ser247-C
14. Active site of Enzyme:
• The active site is the region of the enzyme that binds the
substrate, to form an enzyme–substrate complex, and
transforms it into product (Binding site).
• The active site is a three-dimensional entity, often a cleft
or crevice on the surface of the protein, in which the
substrate is bound by multiple weak interactions (non-
covalent bond).
• Two models have been proposed to explain how an
enzyme binds its substrate: the lock-and-key model
and the induced-fit model.
15. Lock and Key hypothesis
E + S ES E + P
Proposed by Emil Fischer (1894): the shape of the substrate
and the active site of the enzyme are thought to fit together
like a key into its lock.
16.
17. Induced fit hypothesis
proposed in 1958 by Daniel E. Koshland, Jr.: the
binding of substrate induces a conformational change
in the active site of the enzyme.
In addition, the enzyme may distort the substrate,
forcing it into a conformation similar to that of the
transition state
18. For example, the binding of glucose to hexokinase induces
a conformational change in the structure of the enzyme such
that the active site assumes a shape that is complementary to
the substrate (glucose) only after it has bound to the enzyme.
19. Coenzyme and Cofactor
Many enzymes require the presence of small, nonprotein units to carry
out their particular reaction.
Coenzyme: complex organic molecule
Cofactor: inorganic ions, such as Zn2+ or Fe2+
20. Holoenzyme: A complete catalytically-active enzyme together
with its coenzyme or metal ion (cofactor) is called as
holoenzyme.
Apoenzyme: The protein part of the enzyme on its own
without its cofactor/ coenzyme is termed as apoenzyme.
21.
22. Enzyme Kinetics
Activation energy: For a biochemical reaction to proceed, the energy barrier
needed to transform the substrate molecules into the transition state has to be
overcome. The energy required to overcome this energy barrier is known as
activation energy.
It is the magnitude of the activation energy which determines just how fast the
reaction will proceed. It is believed that enzymes increase the rate of reaction by
lowering the activation energy for the reaction they are catalyzing.
24. 1. Substrate concentration
A
B
At low substrate concentrations a doubling of substrate concentration
leads to a doubling of reaction rate, whereas at higher substrate
concentration the enzyme becomes saturated and there is no further
increase in reaction rate (hyperbolic curve)
25. 2. Enzyme concentration
When substrate concentrations is saturating, a doubling of the enzyme
concentration leads to a doubling of rate of reaction
26. 3. pH
Each enzyme has an optimum pH at which the rate of the reaction
that it catalyzes is at its maximum. Slight deviations in the pH from
the optimum lead to a decrease in the reaction rate.
27.
28. A
C
B
4. Temperature
Elevated temperature increases the rate of an enzyme-catalyzed reaction by
increasing the thermal energy of the substrate molecules which helps to
overcome energy barrier or achieve activation energy.
However, a second effect comes into play at higher temperatures.which causes
denaturation of the enzyme and decrease the rate of reaction.
29. Substances which bind to enzyme & disrupt the enzyme
activity by blocking the production of ES-complex or E + P
Many inhibitors exist, including normal body metabolites,
foreign drugs and toxins.
Enzyme inhibition can be of two main types: irreversible
or reversible.
Reversible inhibition can be subdivided into competitive
and noncompetitive.
5. Enzyme Inhibition
30. Irreversible Inhibition
An irreversible inhibitor binds tightly, often covalently, to the
active site of the enzyme, permanently inactivating the
enzyme.
They often form covalent bond with amino acid at active site.
Examples: diisopropylphosphofluoridate (DIPF),
iodoacetamide and penicillin.
Reversible Inhibition
Involves the noncovalent links between
inhibitor and enzyme
31. Reversible Competitive Inhibition
A competitive inhibitor competes with the substrate
molecules for binding to the active site of the enzyme due to
close structural similarities with the substrate molecule.
At high substrate concentration, the effect of a competitive
inhibitor can be overcome.
e.g.: succinate dehydrogenase (E);
succinate (S); malonate (I)
32. Reversible Non-competitive Inhibition
A noncompetitive inhibitor binds at a site other than the active site of the
enzyme and decreases its catalytic rate by causing a conformational
change in the three-dimensional shape of the enzyme.
Inhibitor dont have any structural similarities with the substrate molecule
e.g.: prostaglandin synthase (E); arachidonate (S); aspirin (I)
33. Enzyme inhibitor: harmful or beneficial?
Sarin – the nerve gas
Action – inhibits acetylcholinesterase from hydrolyzing
acetylcholine to acetate & choline
Effect – acetylcholine gather at end of nerve, causing
symptoms such as fuzzy eyesight, extreme sweating,
loss of motor functions control & paralysis
acetylcholinesterase – enzyme in the body which has an
important function in nerve regulation and control
Penicillin – antibacterial agent
Action – covalently attaches to bacterial glycoprotein
peptidase active site, preventing peptidoglycan
peptide bond cross-linking
Effect – prevents cell wall synthesis; exposing bacterial
cell to osmotic lysis; bacteria cannot reproduce
glycoprotein peptidase – bacterial enzyme catalyzing cross-linking
of peptidoglycan peptide bonds, the main cell wall polymer