Name: how cells make and use atp
Uploaded: 2025-06-12T09:32:44.000Z
Duration: 1 min 23 s
Channel: JoVE

ATP, co oznacza trifosforan adenozyny, służy jako główny transporter energii w komórkach. Składa się z cząsteczki adenozyny połączonej z trzema grupami fosforanowymi. Te wysokoenergetyczne wiązania fosforanowe magazynują energię, która jest uwalniana podczas hydrolizy, zasilając różne procesy komórkowe, takie jak biosynteza, transport i ruch. Synteza ATP może zachodzić poprzez trzy mechanizmy. W fosforylacji na poziomie substratu grupa fosforanowa z wysokoenergetycznego związku fosforylowanego jest bezpośrednio przenoszona do ADP, wytwarzając ATP. Fosforylacja oksydacyjna przenosi elektrony z NADH i FADH2 przez łańcuch transportu elektronów, generując gradient protonów, który napędza syntezę ATP. W fotofosforylacji energia świetlna napędza elektrony przez szereg nośników elektronów, tworząc gradient elektrochemiczny, który jest wykorzystywany do syntezy ATP. Sprzężenie syntezy ATP z reakcjami utleniania-redukcji jest podstawowym aspektem metabolizmu komórkowego. ATP jest w sposób ciągły hydrolizowany w celu dostarczenia energii do reakcji anabolicznych i regenerowany podczas reakcji katabolicznych.

atp i produkcja energii

ATP and Energy Production

Trifosforan adenozyny (ATP) to kluczowa cz&#261;steczka pe&#322;ni&#261;ca funkcj&#281; g&#322;&#243;wnego no&#347;nika energii w kom&#243;rkach. Strukturalnie ATP sk&#322;ada si&#281; z cz&#261;steczki adenozyny&#8212;obejmuj&#261;cej adenin&#281; i ryboz&#281;&#8212;po&#322;&#261;czonej z trzema resztami fosforanowymi. Wi&#261;zania wysokoenergetyczne pomi&#281;dzy tymi grupami fosforanowymi magazynuj&#261; znaczne ilo&#347;ci energii potencjalnej. Energia ta jest uwalniana podczas hydrolizy, w trakcie kt&#243;rej ATP przekszta&#322;cane jest w difosforan adenozyny (ADP) lub monofosforan adenozyny (AMP), nap&#281;dzaj&#261;c r&#243;&#380;norodne kluczowe procesy kom&#243;rkowe, takie jak synteza makrocz&#261;steczek, transport wewn&#261;trzkom&#243;rkowy czy ruch mechaniczny.
Mechanizmy syntezy ATP
Synteza ATP zachodzi poprzez trzy g&#322;&#243;wne mechanizmy: fosforylacj&#281; substratow&#261;, fosforylacj&#281; oksydacyjn&#261; oraz fotofosforylacj&#281;.
W fosforylacji substratowej ATP powstaje w wyniku bezpo&#347;redniego przeniesienia reszty fosforanowej z wysokoenergetycznego zwi&#261;zku po&#347;redniego na ADP. Proces ten ma miejsce podczas reakcji glikolizy i cyklu kwasu cytrynowego.
Fosforylacja oksydacyjna stanowi najbardziej wydajny spos&#243;b produkcji ATP. Polega na przenoszeniu elektron&#243;w z koenzym&#243;w&#8212;NADH i FADH_2&#8212;przez &#322;a&#324;cuch transportu elektron&#243;w. Przep&#322;yw elektron&#243;w generuje gradient protonowy przez b&#322;on&#281;, kt&#243;ry jest wykorzystywany przez syntaz&#281; ATP do po&#322;&#261;czenia ADP i nieorganicznego fosforanu, co skutkuje syntez&#261; ATP.
Fotofosforylacja, proces charakterystyczny dla organizm&#243;w fotosyntetyzuj&#261;cych, opiera si&#281; na wykorzystaniu energii &#347;wietlnej do wzbudzenia elektron&#243;w, kt&#243;re przemieszczaj&#261; si&#281; przez szereg przeno&#347;nik&#243;w elektron&#243;w w obr&#281;bie b&#322;ony tylakoidowej chloroplast&#243;w. Powsta&#322;y gradient protonowy nap&#281;dza produkcj&#281; ATP, analogicznie jak w fosforylacji oksydacyjnej.
ATP jako mened&#380;er energetyczny
ATP odgrywa centraln&#261; rol&#281; w zarz&#261;dzaniu energi&#261; kom&#243;rkow&#261;, &#322;&#261;cz&#261;c reakcje kataboliczne z anabolicznymi. W trakcie proces&#243;w katabolicznych, takich jak oddychanie kom&#243;rkowe, ATP jest regenerowane z ADP i fosforanu. Nast&#281;pnie ulega hydrolizie w reakcjach anabolicznych, dostarczaj&#261;c energii niezb&#281;dnej do syntezy biomoleku&#322;. Ten ci&#261;g&#322;y cykl hydrolizy i regeneracji ATP umo&#380;liwia kom&#243;rkom efektywne gospodarowanie zapotrzebowaniem energetycznym, utrzymuj&#261;c homeostaz&#281; i wspieraj&#261;c podstawowe funkcje &#380;yciowe.

ATP i produkcja energii

Trifosforan adenozyny (ATP) to kluczowa cz&#261;steczka pe&#322;ni&#261;ca funkcj&#281; g&#322;&#243;wnego no&#347;nika energii w kom&#243;rkach. ...

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Microbial Metabolism

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KEY TERMS AND CONCEPTS

KLUCZOWE TERMINY I POJĘCIA

how cells make and use atp

ATP is the main energy carrier in cells. It is made of adenosine, which includes adenine and ribose, plus three phosphate groups. The bonds between the phosphate groups hold a large amount of potential energy. When ATP is hydrolyzed, it becomes ADP or AMP and releases energy for cell work.

Cells use that energy for many essential tasks. It supports macromolecule synthesis, intracellular transport, and mechanical movement. ATP also acts as an energy manager by linking catabolic and anabolic reactions. During catabolic processes such as cellular respiration, ATP is regenerated from ADP and phosphate. During anabolic reactions, ATP hydrolysis provides the energy needed to build biomolecules.

Cells produce ATP in three main ways: substrate-level phosphorylation, oxidative phosphorylation, and photophosphorylation. In substrate-level phosphorylation, a phosphate group moves directly from a high-energy intermediate to ADP. This happens during glycolysis and the citric acid cycle. Oxidative phosphorylation makes the most ATP. It uses electrons from NADH and FADH2 that pass through the electron transport chain. Their movement creates a proton gradient across a membrane, and ATP synthase uses that gradient to join ADP with inorganic phosphate and form ATP.

Photophosphorylation occurs in photosynthetic organisms. It uses light energy to excite electrons, which move through electron carriers in the thylakoid membrane of chloroplasts. The electron flow creates a proton gradient, and that gradient drives ATP production. This process works in a similar way to oxidative phosphorylation. Together, ATP hydrolysis and ATP regeneration help cells meet energy needs and maintain homeostasis.

How Cells Make and Use ATP

microbial nutrition

Microbial Energy and Carbon Sources

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atp and energy production

ATP is the main energy carrier in cells. It is made of adenosine, which includes adenine and ribose, plus three phosphate groups. The bonds between the phosphate groups hold a large amount of potential energy. When ATP is hydrolyzed, it becomes ADP or AMP and releases energy for cell work. Cells use that energy for many essential tasks. It supports macromolecule synthesis, intracellular transport, and mechanical movement. ATP also acts as an energy manager by linking catabolic and anabolic...

redox reactions

Electron Carriers in Redox Metabolism

Redox reactions move electrons through metabolic pathways in cells. Oxidation is the loss of electrons, and reduction is the gain of electrons. These two steps happen together, which keeps electron flow moving through metabolism. A clear example appears in bacterial metabolism. Glucose is oxidized to carbon dioxide, while oxygen is reduced to water. This shows how one molecule loses electrons as another gains them. Cells use special electron carriers to make these transfers happen.

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Metabolism is the set of chemical reactions that keep living cells working. It includes reactions that break down biomolecules and reactions that build them up. These two sides of metabolism work together to support energy balance and cell function. Catabolic pathways break large molecules into smaller parts. Carbohydrates, lipids, and proteins can be broken down into monosaccharides, fatty acids, and amino acids. These reactions release energy, and cells store much of that energy as ATP, or...

carbohydrate catabolism

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Glucose breakdown is a key part of cell metabolism that lets cells make ATP, the usable form of energy. The process follows two main paths: cellular respiration and fermentation. Both start with glycolysis, which does not require oxygen. Glycolysis splits one glucose molecule into two molecules of pyruvic acid. It also produces a net gain of two ATP molecules and two NADH molecules. This step sets up the cell to continue with respiration or switch to fermentation, depending on whether oxygen...

glycolysis

Glycolysis and Pyruvate Fate

Glycolysis is a central pathway in glucose catabolism and a major way cells make energy. It is also called the Embden-Meyerhof pathway. This process takes place in the cytoplasm and can work with or without oxygen, which makes it useful in many organisms and conditions. Glycolysis has ten steps and turns one glucose molecule into two pyruvate molecules. It has two phases. In the preparatory phase, the cell uses two ATP to add phosphate groups to glucose and split it into two three-carbon...

other glycolytic pathways

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cellular respiration

Cellular Respiration: ATP Production Pathways

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electron transport chain components

Electron Transport Chain and ATP Production

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chemiosmosis and atp synthesis

Electron Transport Chain Powers ATP Output

The electron transport chain powers ATP production during cellular respiration. It sits in the inner mitochondrial membrane and moves high-energy electrons from NADH and FADH2 to molecular oxygen, the final electron acceptor. As electrons move through the chain, protons are pushed across the membrane to build the gradient needed for ATP synthesis. Electrons from NADH enter the chain at Complex I, also called NADH: ubiquinone oxidoreductase. In prokaryotes, this step helps pump protons from the...

respiration pathways

TCA Cycle and Energy Pathways

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microbial fermentation

Fermentation Products in Microbes

Fermentation is an anaerobic process that lets microbes make energy from sugar without oxygen or an electron transport chain. It is important in both biology and industry. The process is grouped by the products it makes. Pyruvate and its derivatives act as key electron acceptors in fermentative pathways. This step helps oxidize NADH back to NAD+, which is needed for glycolysis to keep running. Without NAD+ regeneration, glycolysis would stop and the cell would lose its main source of ATP under...

metabolism of chemolithotrophs

How Chemolithotrophs Make ATP

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amino acid catabolism

Microbes Use Proteins for Energy

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lipid catabolism

How Microbes Break Down Fats for Energy

Microbes break down triglycerides and fatty acids to make energy. Triglycerides are important long-term energy storage molecules in microorganisms. Lipases hydrolyze, or split with water, triglycerides into glycerol and free fatty acids. Each product then enters a different metabolic route that helps the cell make ATP, the main energy currency. Glycerol metabolism begins after glycerol is released from triglyceride hydrolysis. Glycerol kinase adds a phosphate group to form glycerol-3-phosphate.

oxygenic photosynthesis

How Plants Make Oxygen and ATP

Oxygenic photosynthesis is the process plants, algae, and cyanobacteria use to capture light energy and turn it into chemical energy. It uses water as the source of electrons and releases molecular oxygen, or O2. The process also produces ATP and NADPH, which cells need for later energy use and carbon fixation. The main reactions happen in the thylakoid membranes, where chlorophyll pigments absorb light. In cyanobacteria, these membranes come from folds in the plasma membrane. Two photosystems...

anoxygenic photosynthesis

Bacterial Light Capture Without Oxygen

Anoxygenic photosynthesis is a bacterial way to capture light energy without making oxygen. It supports carbon fixation, but it does not use water as the electron donor. Instead, these phototrophs use other electron donors such as hydrogen sulfide, elemental sulfur, thiosulfate, or organic compounds. This process is carried out by several groups of bacteria, including purple bacteria, green sulfur bacteria, heliobacteria, and other anoxygenic phototrophs. These organisms have evolved a...

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How Bacteria Build Key Macromolecules

Bacteria build essential macromolecules through tightly controlled biosynthetic pathways. These anabolic reactions make proteins, nucleic acids, lipids, and polysaccharides. The products support growth, cell division, and normal cell function. Bacterial biosynthesis starts with precursor metabolites from glycolysis, the pentose phosphate pathway, and the Krebs cycle. Important precursors include pyruvate, acetyl-CoA, and glucose-6-phosphate. Cells use these compounds to make the monomers that...

carbon-dioxide fixation

Microbial Carbon Fixation Pathways

Microbial carbon fixation pathways let prokaryotes turn carbon dioxide into organic molecules. This process supports biosynthesis, helps sustain ecosystems, and plays a role in the global carbon cycle. It also has industrial uses in carbon capture and bioproduct synthesis. Autotrophic organisms depend on this process to use CO2 as a carbon source in many environments. The Calvin cycle is the most common carbon fixation pathway. Cyanobacteria and other autotrophic prokaryotes use it, and it...

biosynthesis of polysaccharides

Activated Sugars for Polysaccharide Synthesis

Activated sugars drive polysaccharide synthesis in cells. Glycogen and starch are built from nucleoside diphosphate sugars, mainly uridine diphosphate glucose (UDPG) and adenosine diphosphate glucose (ADPG). These sugar donors act as high-energy intermediates in carbohydrate metabolism and biosynthesis. UDPG supports glycogen synthesis in animals and many bacteria. It forms when glucose-1-phosphate reacts with uridine triphosphate (UTP). UDP-glucose pyrophosphorylase catalyzes this reaction.

inorganic nitrogen assimilation

Nitrogen Uptake by Microbes

Nitrogen uptake by microbes is essential for making proteins, nucleic acids, and other cell parts. Many bacteria and archaea take in nitrogen as nitrate or ammonia. They then convert it into forms that can be built into biomolecules. When nitrate enters a cell, it goes through assimilatory nitrate reduction. This is a two-step process. First, nitrate reductase changes nitrate to nitrite using NADH or FAD as an electron donor, depending on environmental and cellular conditions. Then nitrite...

sulfur assimilation

Sulfur Uptake and Cysteine Synthesis

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amino acid biosynthetic pathways

Amino Acid Building from Cell Metabolites

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biosynthesis of nucleic acids

Nucleotide Building Blocks for DNA and RNA

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biosynthesis of lipids

How Membrane Lipids Vary Across Life

Membrane lipids vary across Bacteria, Archaea, and Eukarya, and these differences help cells survive in different environments. The three domains of life make lipids through distinct biosynthetic pathways. Those pathways create membranes with different stability, permeability, and flexibility. Bacteria and eukaryotes both build fatty acid-based lipids from acetyl-CoA and malonyl-CoA. The pathway includes condensation, reduction, and dehydration steps. Bacteria use a type II fatty acid...

formation of lipopolysaccharides

Lipopolysaccharides and Gram-Negative Defense

Lipopolysaccharides (LPS) are important parts of the outer membrane of Gram-negative bacteria. They help stabilize the membrane and help protect bacteria from host immune responses. LPS has three main parts: lipid A, a core oligosaccharide, and an O antigen. LPS biosynthesis and assembly depend on a coordinated set of enzymes and transport steps. The molecule is also known as an endotoxin. It can activate Toll-like receptor 4 (TLR4) in the host and trigger strong immune responses. In severe...

key terms and concepts

Learn how cells make and use ATP through substrate-level phosphorylation, oxidative phosphorylation, and photophosphorylation to power cell processes.

How Cells Make and Use ATP | JoVE K12

JoVE Core Microbiology provides an engaging introduction to the microbial world and its influence on health, industry, and the environment. This comprehensive collection covers key concepts such as microbial structure, metabolism, genetics, and ecology. It introduces essential laboratory techniques and microscopy methods through visually engaging animations. Corresponding scientist-in-action videos bridge classroom concepts with real-world research and applications.

microbiology

How Cells Make and Use ATP

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