Name: atp powers cellular transport and reactions
Uploaded: 2025-05-22T09:05:36.000Z
Duration: 1 min 31 s
Channel: JoVE

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From Molecules to Organisms: Structures and Processes

HS-LS1-5

ATP Energy Storage and Release

أدينوسين ثلاثي الفوسفات أو ATP هو أهم عملة طاقة تعمل على تشغيل العديد من العمليات الكيميائية الحيوية داخل الخلية الحية.
ATP هو مركب عضوي يتكون من جزيء أدينوزين ممثل على شكل A ، مرتبط بثلاث مجموعات فوسفات ممثلة بالحرف P. ترتبط الفوسفات الثلاثة ببعضها البعض بواسطة رابطتين من الفوسفونهيدريد عالي الطاقة. يمكن أن ينتج عن التحلل المائي لهذه الروابط حوالي 46 إلى 54 كيلوجول لكل مول من الطاقة الحرة ، اعتمادا على الظروف داخل الخلايا.
نظرا لأن ارتباط مجموعة الفوسفات بجزيء ADP غير موات من الناحية الحيوية ، فإن الخلايا تستمد الطاقة من عملية التمثيل الضوئي أو التنفس الخلوي لتشكيل رابطة الفوسفونهيدريد بين ADP ومجموعة الفوسفات الثالثة.
على العكس من ذلك ، عند الطلب على الطاقة ، يتم تحلل ATP إلى فوسفات غير عضوي وجزيء ADP. يقترن هذا التفاعل المواتي بقوة بتفاعلات أخرى غير مواتية ، حيث يتم نقل الفوسفات المنطلق إلى المادة المتفاعلة لتشكيل منتج جديد.
بالإضافة إلى ذلك ، فإن الطاقة المنبعثة من التحلل المائي ATP تعمل على تشغيل المضخات التي تحرك المواد المذابة عبر الأغشية وتعمل أيضا على تقلص العضلات ومسارات نقل الإشارات العصبية.

تخزين وإطلاق طاقة الـ atp

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جزيء ATP جزيء غير مستقر للغاية. إلا إذا تم استخدامه بسرعة لأداء عمل، يتفكك الـ ATP تلقائيًّا إلى ADP وفوسفات غير عضوي (Pi)، وتُفقد الطاقة الحرة المنطلقة أثناء هذه العملية في صورة حرارة. تُستخدَم الطاقة المنطلقة من التحلل المائي للـ ATP لأداء عمل داخل الخلية، وتعتمد على استراتيجية تُسمَّى اقتران الطاقة. وتقرن الخلايا التفاعل الطارد للطاقة الناتج عن التحلل المائي للـ ATP بالتفاعلات الداخلية للطاقة 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 (مضخة Na^+/K^+ ) بدفع الصوديوم خارج الخلية والبوتاسيوم إلى داخل الخلية. يتم إنفاق نسبة كبيرة من الـ ATP في الخلية لتشغيل هذه المضخة لأن العمليات الخلوية تستورد بانتظام كميات كبيرة من الصوديوم إلى الخلية وتصدر كميات كبيرة من البوتاسيوم خارج الخلية. تعمل المضخة باستمرار على تثبيت التركيزات الخلوية للصوديوم والبوتاسيوم. لكي تقوم المضخة بدورة واحدة (تصدير ثلاثة أيونات Na^+ واستيراد اثنان أيوناتK^+)، يجب أن يتم تحلل جزيء واحد من الـ ATP. عندما يتم تحلل الـ ATP، يتم نقل فوسفات جاما الخاص به إلى بروتين المضخة.

تسمى عملية ربط مجموعة الفوسفات بجزيء ما بالفسفرة. كما هو الحال مع معظم حالات التحلل المائي للـ ATP، يتم نقل الفوسفات من الـ ATP إلى جزيء آخر. في حالة الفسفرة، تتمتع مضخة Na^+/K^+ بقدر أكبر من الطاقة الحرة ويتم تحفيزها للخضوع لتغيير تكويني. يسمح هذا التغيير بإطلاقNa^+ إلى خارج الخلية. ثم يقوم بعد ذلك بربط K^+ خارج الخلية، والذي، من خلال تغيير تكويني آخر، يؤدي إلى انفصال الفوسفات عن المضخة. يؤدي إطلاق الفوسفات هذا إلى إطلاق K^+ إلى داخل الخلية. بشكل أساسي، تقترن الطاقة المنطلقة من التحلل المائي لـ ATP بالطاقة اللازمة لتشغيل المضخة ونقل أيونات Na^+ و K^+ . يقوم الـ ATP بالعمل الخلوي باستخدام هذا الشكل الأساسي من اقتران الطاقة من خلال الفسفرة.

في كثير من الأحيان أثناء التفاعلات الأيضية الخلوية، مثل تركيب العناصر الغذائية وانهيارها، يجب أن تتغير جزيئات معينة قليلاً في شكلها لتصبح ركائز للخطوة التالية في سلسلة التفاعل. أحد الأمثلة على ذلك هو أثناء تحلل السكر، وهي الخطوات الأولى للتنفس الخلوي. في هذه الخطوة الأولى، مطلوب الـ ATP لفسفرة الجلوكوز، مما ينتج 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، يشكل التفاعل المطلق للطاقة للتحلل المائي للـ ATP، والأزواج مع التفاعل المولد للطاقة لفسفرة الجلوكوز، خطوة وسيطة في المسار. مرة أخرى، تم استخدام الطاقة المنطلقة عن طريق كسر رابطة الفوسفات داخل للـ ATP في فسفرة جزيء آخر، مما أدى إلى إنشاء وسيط غير مستقر وتحفيز تغيير تكويني مهم.

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تخزين وإطلاق طاقة الـ ATP

ATP هو جزيء غير مستقر للغاية. ما لم يتم استخدامه بسرعة لأداء العمل ، يتفكك ATP تلقائيا إلى ADP والفوسفات غير العضوي (Pi) ، والفوسفات الحر ...

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 transport and reactions

ATP powers cellular transport and many reactions by transferring energy through phosphorylation. ATP is a highly unstable molecule. If it is not used quickly, it breaks down into ADP and inorganic phosphate, and the released energy is lost as heat.

Cells use ATP through energy coupling. This means the exergonic reaction of ATP hydrolysis is linked to an endergonic reaction so the reaction can move forward. One major example is the sodium-potassium pump, a transmembrane ion pump that is vital for cell function.

The sodium-potassium pump moves sodium out of the cell and potassium into the cell. Cells spend a large amount of ATP on this pump because sodium and potassium are regularly moved in opposite directions across the membrane. To complete one cycle, the pump exports three sodium ions and imports two potassium ions, and one ATP molecule must be hydrolyzed.

During ATP hydrolysis, the gamma phosphate is transferred to the pump protein. This is called phosphorylation, which means a phosphate group binds to a molecule. In the phosphorylated state, the pump has more free energy and changes shape. That shape change lets it release sodium outside the cell. The pump then binds potassium outside the cell, and another shape change removes the phosphate and releases potassium inside the cell.

ATP also helps start steps in cellular metabolism. In glycolysis, which is the first stage of cellular respiration, ATP phosphorylates glucose. This creates a high-energy but unstable intermediate. The phosphorylation also drives a conformational change that helps the molecule become phosphorylated fructose, which is needed for glycolysis to continue. In both examples, ATP hydrolysis is coupled to another reaction by transferring a phosphate group and powering an important change in shape.

ATP Powers Cellular Transport and Reactions

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ATP Powers Cellular Transport and Reactions

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