Enzymes are usually proteins that act as catalysts and speed up biochemical reactions without being consumed. They have optimal temperatures and pH levels for activity. The Michaelis-Menten equation describes how reaction velocity varies with substrate concentration. Competitive inhibitors bind the enzyme's active site, increasing Km; noncompetitive inhibitors bind elsewhere, decreasing Vmax. Enzymes are important clinically as markers of tissue damage - creatine kinase and lactate dehydrogenase indicate heart attacks, while alanine transaminase, aspartate transaminase and alkaline phosphatase detect liver disease. Troponin is a very specific marker for myocardial infarction.
In this ppt competitive inhibition of enzymes is fully explained with its examples. it will be helpful for all the life science students. Non Competitive inhibition , Uncompetitive inhibition & Irreversible inhibition of Enzymes have been well explained in this presentation. it will be helpful for biochemistry, botany, zoology and other life/bio sciences students. I tried to explain Allosteric enzymes, their mechanism of action, Allosteric inhibition, Feedback inhibition in this presentation so that it can be easy to understand the concept for viewers.
In this ppt competitive inhibition of enzymes is fully explained with its examples. it will be helpful for all the life science students. Non Competitive inhibition , Uncompetitive inhibition & Irreversible inhibition of Enzymes have been well explained in this presentation. it will be helpful for biochemistry, botany, zoology and other life/bio sciences students. I tried to explain Allosteric enzymes, their mechanism of action, Allosteric inhibition, Feedback inhibition in this presentation so that it can be easy to understand the concept for viewers.
This ppt describes the overview of enzyme regulation and Allosterism. Presented since October 23,2017GC at Addis Ababa University, School of Medicine, Department of medical biochemistry.
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.
A comprehensive coverage of Enzymes including basics, mechanisms of enzyme catalysis, enzyme inhibition and clinical applications, mostly based on Stryer- Biochemistry. The slides were intended for MBBS teaching, but should benefit the students of Biochemistry and allied sciences.
Prepared in Sept 2015
This ppt describes the overview of enzyme regulation and Allosterism. Presented since October 23,2017GC at Addis Ababa University, School of Medicine, Department of medical biochemistry.
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.
A comprehensive coverage of Enzymes including basics, mechanisms of enzyme catalysis, enzyme inhibition and clinical applications, mostly based on Stryer- Biochemistry. The slides were intended for MBBS teaching, but should benefit the students of Biochemistry and allied sciences.
Prepared in Sept 2015
Medicine Lvl 1 Biochemistry: ENZYMES AND BIOENERGETICSPaula Marie Llido
Medicine Lvl 1 Biochemistry: ENZYMES AND BIOENERGETICS SGD 9 compiled by Paula Marie M. Llido
-Enzymes
-Major Classes of Enzymes
-Factors affecting enzymes
-Michaelis Menter and Hill Equation
-Enzymes for Clinical Diagnosis
-Glycolysis
-Krebs Cycle
-Oxidative Phosphorylation
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New Directions in Targeted Therapeutic Approaches for Older Adults With Mantl...i3 Health
i3 Health is pleased to make the speaker slides from this activity available for use as a non-accredited self-study or teaching resource.
This slide deck presented by Dr. Kami Maddocks, Professor-Clinical in the Division of Hematology and
Associate Division Director for Ambulatory Operations
The Ohio State University Comprehensive Cancer Center, will provide insight into new directions in targeted therapeutic approaches for older adults with mantle cell lymphoma.
STATEMENT OF NEED
Mantle cell lymphoma (MCL) is a rare, aggressive B-cell non-Hodgkin lymphoma (NHL) accounting for 5% to 7% of all lymphomas. Its prognosis ranges from indolent disease that does not require treatment for years to very aggressive disease, which is associated with poor survival (Silkenstedt et al, 2021). Typically, MCL is diagnosed at advanced stage and in older patients who cannot tolerate intensive therapy (NCCN, 2022). Although recent advances have slightly increased remission rates, recurrence and relapse remain very common, leading to a median overall survival between 3 and 6 years (LLS, 2021). Though there are several effective options, progress is still needed towards establishing an accepted frontline approach for MCL (Castellino et al, 2022). Treatment selection and management of MCL are complicated by the heterogeneity of prognosis, advanced age and comorbidities of patients, and lack of an established standard approach for treatment, making it vital that clinicians be familiar with the latest research and advances in this area. In this activity chaired by Michael Wang, MD, Professor in the Department of Lymphoma & Myeloma at MD Anderson Cancer Center, expert faculty will discuss prognostic factors informing treatment, the promising results of recent trials in new therapeutic approaches, and the implications of treatment resistance in therapeutic selection for MCL.
Target Audience
Hematology/oncology fellows, attending faculty, and other health care professionals involved in the treatment of patients with mantle cell lymphoma (MCL).
Learning Objectives
1.) Identify clinical and biological prognostic factors that can guide treatment decision making for older adults with MCL
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Basavarajeeyam is an important text for ayurvedic physician belonging to andhra pradehs. It is a popular compendium in various parts of our country as well as in andhra pradesh. The content of the text was presented in sanskrit and telugu language (Bilingual). One of the most famous book in ayurvedic pharmaceutics and therapeutics. This book contains 25 chapters called as prakaranas. Many rasaoushadis were explained, pioneer of dhatu druti, nadi pareeksha, mutra pareeksha etc. Belongs to the period of 15-16 century. New diseases like upadamsha, phiranga rogas are explained.
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Ozempic: Preoperative Management of Patients on GLP-1 Receptor Agonists Saeid Safari
Preoperative Management of Patients on GLP-1 Receptor Agonists like Ozempic and Semiglutide
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TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Ve...kevinkariuki227
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
Report Back from SGO 2024: What’s the Latest in Cervical Cancer?bkling
Are you curious about what’s new in cervical cancer research or unsure what the findings mean? Join Dr. Emily Ko, a gynecologic oncologist at Penn Medicine, to learn about the latest updates from the Society of Gynecologic Oncology (SGO) 2024 Annual Meeting on Women’s Cancer. Dr. Ko will discuss what the research presented at the conference means for you and answer your questions about the new developments.
MANAGEMENT OF ATRIOVENTRICULAR CONDUCTION BLOCK.pdfJim Jacob Roy
Cardiac conduction defects can occur due to various causes.
Atrioventricular conduction blocks ( AV blocks ) are classified into 3 types.
This document describes the acute management of AV block.
Recomendações da OMS sobre cuidados maternos e neonatais para uma experiência pós-natal positiva.
Em consonância com os ODS – Objetivos do Desenvolvimento Sustentável e a Estratégia Global para a Saúde das Mulheres, Crianças e Adolescentes, e aplicando uma abordagem baseada nos direitos humanos, os esforços de cuidados pós-natais devem expandir-se para além da cobertura e da simples sobrevivência, de modo a incluir cuidados de qualidade.
Estas diretrizes visam melhorar a qualidade dos cuidados pós-natais essenciais e de rotina prestados às mulheres e aos recém-nascidos, com o objetivo final de melhorar a saúde e o bem-estar materno e neonatal.
Uma “experiência pós-natal positiva” é um resultado importante para todas as mulheres que dão à luz e para os seus recém-nascidos, estabelecendo as bases para a melhoria da saúde e do bem-estar a curto e longo prazo. Uma experiência pós-natal positiva é definida como aquela em que as mulheres, pessoas que gestam, os recém-nascidos, os casais, os pais, os cuidadores e as famílias recebem informação consistente, garantia e apoio de profissionais de saúde motivados; e onde um sistema de saúde flexível e com recursos reconheça as necessidades das mulheres e dos bebês e respeite o seu contexto cultural.
Estas diretrizes consolidadas apresentam algumas recomendações novas e já bem fundamentadas sobre cuidados pós-natais de rotina para mulheres e neonatos que recebem cuidados no pós-parto em unidades de saúde ou na comunidade, independentemente dos recursos disponíveis.
É fornecido um conjunto abrangente de recomendações para cuidados durante o período puerperal, com ênfase nos cuidados essenciais que todas as mulheres e recém-nascidos devem receber, e com a devida atenção à qualidade dos cuidados; isto é, a entrega e a experiência do cuidado recebido. Estas diretrizes atualizam e ampliam as recomendações da OMS de 2014 sobre cuidados pós-natais da mãe e do recém-nascido e complementam as atuais diretrizes da OMS sobre a gestão de complicações pós-natais.
O estabelecimento da amamentação e o manejo das principais intercorrências é contemplada.
Recomendamos muito.
Vamos discutir essas recomendações no nosso curso de pós-graduação em Aleitamento no Instituto Ciclos.
Esta publicação só está disponível em inglês até o momento.
Prof. Marcus Renato de Carvalho
www.agostodourado.com
NVBDCP.pptx Nation vector borne disease control programSapna Thakur
NVBDCP was launched in 2003-2004 . Vector-Borne Disease: Disease that results from an infection transmitted to humans and other animals by blood-feeding arthropods, such as mosquitoes, ticks, and fleas. Examples of vector-borne diseases include Dengue fever, West Nile Virus, Lyme disease, and malaria.
2. • Biocatalyst
• Usually proteins except ribozyme (RNA particles with catalytic activity
)
• With out being changed themselves
3. Enzyme activity
Unit of enzyme activity • Amount causing transformation of 1 um of
substrate /min at 25 *C
• Expressed as mole of substrate utilised or mole of
product formed
Specific activity • No of protein units /mg of protein
• Measure of enzyme purity
• Higher the enzyme purity higher the specific
activity
Turn over number • Number of substrate molecules transformed per
unit time by a single enzyme molecule (when
enzyme concentration alone is limiting factor)
• Highest turnover catalase (fastest enzyme)
followed by carbonic anhydrase
• Lowest turnover lysozyme (slowest enzyme)
4. Some enzymes are produced as proenzymes
• Inactive precursors zymogens or proenzymes
• Proelastase
• Pepsinogen
5.
6. Co enzyme
• organic molecule required by
enzyme
Co factor
• Inorganic molecule required by
enzyme
7.
8.
9.
10.
11.
12.
13. Nomenclature of enzyme
• EC stands for enzyme commission, and
• the first digit stands for the class name (transferase),
• the second digit stands for the subclass
• 3rd digit sub sub class
• 4th digit individual enzyme
23. • Most enzyme – substrate
combinations are mostly d/t weak
non covalent modification like
hydrogen bond hydrophobic
interactions & van der waal forces
• Increase the rate of biochemical
reaction
• Lowering the magnitude of the
activation energy barrier
• decreasining free energy of activation
32. Michaelis menten equation
• Reaction velocity varies with substrate
concentration
• V0initial velocity
• Vmax maximum velocity
• Km michaelis menten constant
• [S] substrate concentration
33. Km (michaelis menten constant)
• Substrate concentration at which reaction rate is half maximum
• Constant for each enzyme
• Reflects binding affinity of the enzyme for its substrate
• High enzyme substrate affinity implies a low Km value
• Low affinity implies high Km
• Natural substrate has lowest km
• key enzyme has highest km
42. Competitive inhibition
• Inhibitor is structural analog of substrate
• Binds to same site as substrate
• Km increases
• Reversible
• excess substrate abolishes inhibition
• Vmax remains same
• Km increase
45. • Competitive inhibition
• Eg
• Statin on HMG coA reductase
• MTX on DHFR
• Dicumarol in vitamin K epoxide
• Succinate dehydrogenase by malonate
46.
47. • Effect on Vmax:
• The effect of a competitive inhibitor is reversed by increasing [S]. At a
sufficiently high substrate concentration, the reaction velocity reaches the
Vmax observed in the absence of inhibitor .
• Effect on Km:
• A competitive inhibitor increases the apparent Km for a given substrate. This
means that, in the presence of a competitive inhibitor, more substrate is
needed to achieve 1⁄2Vmax.
48. Non competitive inhibition
• Can be reversible or irreversible
• Mostly irreversible
• Inhibitor have no structural similarity to
substrate
• Bind to site other than substrate binding site
• Affinity to substrate same Km remains same
• Excess substrate donot abolish inhibition
• Vmax decreases
• Less enzyme activity
49. • 1. Effect on Vmax:
• Noncompetitive inhibition cannot be overcome by increasing the
concentration of substrate. Thus, noncompetitive inhibitors decrease the
apparent Vmax of the reaction.
• 2. Effect on Km:
• Noncompetitive inhibitors do not interfere with the binding of substrate to
enzyme. Thus, the enzyme shows the same Km in the presence or absence of
the noncompetitive inhibitor.
56. Uncompetitive inhibitor
• Bind only to enzyme substrate
complex ESI complex
• Decrease in both Vmax
• Km reduced
• Phenylalanine & placental ALP
57.
58. Suicide inhibition
• Mechanism based inactivation
• Inhibitors are unreactive until they are converted by enzyme in to
active product
• Which in turn inhibits the enzyme
• Eg aspirin COX
• Allopurinol xanthine oxidase
62. • Regulation of enzyme quality
• Allosteric regulation
• Covalent modification
• Regualtion of enzyme quality
• Control of enzyme synthesis induction & repression
• Control of enzyme degradation
63. Allosteric regulation
• Allosteric enzymes have a separate site where a modifier binds other
site for binding of substrates
• Can be
• Allosteric activator
• Allosteric inhibitor
71. Phosphorylation most common covalent
modification
Enzymes active in phosphorylated
state
• Glycogen phosphorylase
• Key enzymes of gluconeogenesis
Enzymes active in dephosphorylated
sate
• Glycogen synthase
• Enzymes of glycolysis
74. • Serine Proteases
• They are enzymes with a serine residue at the active site and most of the
proteolytic enzymes belong to this group, e.g. trypsin, chymotrypsin, clotting
factors
79. CK MB
• First enzyme to elevate
• Rises in 3- 8 hrs
• Remain elevated for 3 days
• Early diagnosis of MI
80. CK is a dimer made up of 2 subunits B & M
subunits
81.
82. Fetal reversion
• Damaged skeletal muscle may contain more CK-MB owing to
phenomenon of fetal reversion, thus serum CK-MB isoenzyme may
increase in such conditions.
• In c/c muscle disorders
83. LDH
• Tetramer made of H & M subunits
• 5 isoenzymes
• Normally in blood LDH2 > LDH1
• But in MI LDH 1 > LDH2 } FLIPPED PATTERN
84. • LDH
• Elevated after 12- 18 hrs (last enzyme to elevate)
• Peak value in 3 days
• Remain elevated for 14 days late diagnosis of MI
88. AST
• Elevated in MI & hepatocellular damage
• Non specific
• Elevated after days & lasts for less duration
• Not used in diagnosis
89.
90. Pro BNP
• The best marker of ventricular dysfunction is pro-BNP.
91. Ischemia modifed albumin (IMA)
• Myocardial ischemia alters the N-terminus of albumin reducing the
ability of cobalt to bind to albumin.
• Rises with in 6 – 10 minutes
• Low specificity (ischemia in any organ)
• negative value is highly useful, as it rules out the possibility of MI
94. • Troponin I
• is released into the blood within 4 hours after the onset of symptoms of
myocardial ischemia; peaks at 14–24 hours and remains elevated for 3–5 days
postinfarction
• Troponin T (TnT)
• increases within 6 hours of myocardial infarction, peaks at 72 hours and then
remains elevated up to 10–14 days
98. H -FABP
• Heart type fatty acid binding protein
• Used as predictor of death or MI @ 1 yr in ACS
• H FABP – ve low mortality
• H FABP +ve high mortality
102. Isoenzymes of ALP
• Alpha 1 ALP-
• epithelial cells of biliary canaliculi
• increased in obstructive jaundice
• Alpha 2 heat labile ALP-
• hepatic cells
• Moderate elevation in jaundice
• Alpha 2 heat stable ALP placental
• -not destroyed at 65˚C inhibited by phenylalanine
• Pre beta ALP – bone,heat labile
• Gamma ALP –
• intestinal cells inhibited by phenylalanine
• Elevated in ulcerative colitis
• Leukocyte alkaline phosphatase
• –decreased in CML increase in lymphoma
103. • ATYPICAL ISOENZYMES
• Regan isoenzyme-heat stable,inhibited by L-phenylalanine
• a/w ca liver lung GIT
• Also increased in smokers
• Nagao isoenzyme- variant of regan inhibited by L-leucine
• In pleural malignancy
105. GGT (gamma glutamyl transferase )
• Very sensitive for alcoholic liver ds
• Present on membrane surface
106. Pancreatic ds
• S amylase
• Non specific
• Increased in all cases of a/c abdomen
• Small protein excreted in urine elevated in renal failure
• S lipase
• Specific
108. Acid phosphatase
• Secreted by prostate cells, RBC, platelets and WBC.
• prostate iso-enzyme is inactivated by tartaric acid
• Erythrocytic form is inhibited by cupric ions
• increased in prostate cancer and highly elevated in bone metastasis of
prostate cancer
• tartrate labile iso-enzyme is elevated.
• This assay is very helpful in follow-up of treatment of prostate cancers.
Tartrate resistant acid phosphatase
• Elevated in osteoclastoma
• Osteodystrophy
• Metabolic bone ds
109. PROSTATE SPECIFIC ANTIGEN (PSA)
• serine protease
• Normal value is 1–5 mg/L.
• It is very specifc for prostate activity.
• Values above 10 mg/L is indicative of prostate cancer