Name: atp powers cellular work
Uploaded: 2025-05-22T09:05:36.000Z
Duration: 1 min 17 s
Channel: JoVE

K12 Standards

Louisiana Student Standards for Science

High School

Chemistry

Matter And Its Interactions

HS-PS1-4

Coupled Reactions

يحدث اقتران الطاقة عندما يعمل تفاعل شديد الطارقة على تشغيل تفاعل منشط للطاقة. يسمى التفاعل المشترك بالتفاعل المقترن.
تستخدم الخلايا تفاعلات مقترنة لأداء عمليات مختلفة ، بما في ذلك التخليق الحيوي والنقل النشط للأيونات والعمل الميكانيكي. التحلل المائي ل ATP هو تفاعل مفرط للطاقة يقترن بشكل متكرر لتشغيل العمليات البيولوجية.
على سبيل المثال ، يقترن التفاعل الطارد بين الغلوتامات والأمونيا لتكوين الجلوتامين بالتحلل المائي الطارد للطاقة ل ATP إلى ADP والفوسفات غير العضوي.
التغير الصافي للطاقة الحرة للتفاعل المقترن هو مجموع تغيرات الطاقة الحرة الفردية. بسبب ΔG للتحلل المائي ATP، إجمالي تغير الطاقة الحرة القياسية هو سالب 16.3 كيلو جول/مول، ويمكن أن يستمر التفاعل.
غالبا ما تشترك تفاعلات التخليق الحيوي المقترنة في وسيط مشترك غير مستقر. في التخليق الحيوي للجلوتامين ، يشكل نقل الفوسفات من ATP إلى الغلوتامات فوسفات الجلوتاميل الوسيط ، والذي يتفاعل بعد ذلك مع الأمونيا لتكوين الجلوتامين.

التفاعلات المقترنة

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تحدث العمليات الخلوية مثل بناء وتكسير الجزيئات المعقدة من خلال تفاعلات كيميائية تدريجية. بعض هذه التفاعلات الكيميائية تكون عفوية وتطلق طاقة، في حين أن البعض الآخر يحتاج إلى طاقة للمتابعة. غالبًا ما تجمع الخلايا تفاعل إطلاق الطاقة مع التفاعل الذي يتطلب الطاقة للقيام بوظائف الخلية المهمة.

يمكن الوصول بسهولة إلى الطاقة الموجودة في جزيئات الأدينوسين ثلاثي الفوسفات أو الـ ATP للقيام بالعمل. يعمل الـ ATP على تشغيل غالبية التفاعلات الخلوية التي تتطلب الطاقة. تربط الخلايا التحلل المائي للـ ATP مع التفاعلات الداخلية مما يسمح لها بالمتابعة. أحد الأمثلة على اقتران الطاقة باستخدام الـ ATP يتضمن مضخة أيونية عبر الغشاء تعتبر مهمة للغاية للوظيفة الخلوية. تقوم مضخة الصوديوم والبوتاسيوم (مضخةNa^+/K^+) بدفع الصوديوم خارج الخلية والبوتاسيوم إلى داخل الخلية. تعمل نسبة كبيرة من الـ ATP في الخلية على تشغيل هذه المضخة، لأن العمليات الخلوية تجلب كمية كبيرة من الصوديوم إلى الخلية والبوتاسيوم خارجها. تعمل المضخة باستمرار على تثبيت التركيزات الخلوية للصوديوم والبوتاسيوم.

في كثير من الأحيان أثناء التفاعلات الأيضية الخلوية، مثل تركيب العناصر الغذائية وتفكيكها، يجب أن تتغير جزيئات معينة قليلاً في شكلها لتصبح ركائز للخطوة التالية في سلسلة التفاعل. أحد الأمثلة على ذلك هو خلال الخطوات الأولى للتنفس الخلوي، عندما يتحلل جزيء السكر الجلوكوز في تحلل السكر. في الخطوة الأولى، مطلوب الـ ATP لفسفرة الجلوكوز، مما يخلق مادة وسيطة عالية الطاقة ولكنها غير مستقرة. يعمل تفاعل الفسفرة هذا على إحداث تغيير تكويني يسمح لجزيء الجلوكوز المفسفر بالتحول إلى سكر الفركتوز المفسفر. يعتبر الفركتوز وسيطًا ضروريًا للمتابعة في عملية تحلل السكر. هنا، يقترن التفاعل المولد للطاقة للتحلل المائي للـ ATP مع التفاعل المولد للطاقة لتحويل الجلوكوز إلى وسيط مفسفر في المسار. مرة أخرى، تم استخدام الطاقة المنطلقة عن طريق كسر رابطة الفوسفات داخل الـ ATP في فسفرة جزيء آخر، مما أدى إلى إنشاء وسيط غير مستقر وتحفيز تغيير تكويني مهم.

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تحدث العمليات الخلوية مثل بناء وتكسير الجزيئات المعقدة من خلال تفاعلات كيميائية تدريجية. بعض هذه التفاعلات الكيميائية هي ...

Education

JoVE Core

Cell Biology

بيولوجيا الخلية

Unit 1

الوحدة الأولى

Energy and Catalysis

الطاقة والتحفيز

KEY TERMS AND CONCEPTS

المصطلحات والمفاهيم الأساسية

atp powers cellular work

ATP powers many kinds of cellular work by coupling energy-releasing reactions to energy-requiring ones. Some reactions happen on their own and release energy. Others need an energy input to move forward. Cells link these reactions so important processes can still occur.

Adenosine triphosphate, or ATP, stores energy that cells can use quickly. ATP hydrolysis is the breaking of ATP, and it releases energy. Cells often use that released energy to drive endergonic reactions, which are reactions that require energy. This coupling helps cells carry out most energy-requiring reactions.

One major example is the sodium-potassium pump, or Na+/K+ pump. This transmembrane ion pump moves sodium out of the cell and potassium into the cell. Many cell processes bring sodium in and potassium out, so a large share of cellular ATP is used to keep these ion levels stable. The pump works constantly to support cell function.

ATP also helps reactions in metabolism, including the first steps of glycolysis, which is part of cellular respiration. In the first step, ATP phosphorylates glucose by adding a phosphate group. This creates a high-energy but unstable intermediate. The phosphorylation causes a conformational change, or shape change, that lets the molecule continue through the pathway.

That shape change allows the phosphorylated glucose to become phosphorylated fructose, which is needed for glycolysis to proceed. Here again, the exergonic reaction of ATP hydrolysis is paired with an endergonic reaction in the pathway. The energy released from breaking a phosphate bond in ATP is used to phosphorylate another molecule and keep the reaction series moving forward.

ATP Powers Cellular Work

the first law of thermodynamics

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Free Energy and Reaction Direction

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Diffusion-Controlled Enzymes and Reaction Speed

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ATP Powers Cellular Transport and Reactions

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ATP powers many kinds of cellular work by coupling energy-releasing reactions to energy-requiring ones. Some reactions happen on their own and release energy. Others need an energy input to move forward. Cells link these reactions so important processes can still occur. Adenosine triphosphate, or ATP, stores energy that cells can use quickly. ATP hydrolysis is the breaking of ATP, and it releases energy. Cells often use that released energy to drive endergonic reactions, which are reactions...

key terms and concepts

See how ATP drives cellular work through energy coupling, from the sodium-potassium pump to glucose phosphorylation in glycolysis.

ATP Powers Cellular Work | JoVE K12

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JoVE Core Cell Biology illustrates complex cellular processes in easy-to-understand yet comprehensive animated video lessons. This collection focuses on the essential components and functions of cells, including organelles and membranes, cellular transport, and cell energetics. It is complemented by scientist-in-action videos that demonstrate the application of cell biology in real-world research experiments.

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HS-PS1-3

ATP Powers Cellular Work

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