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

צימוד אנרגיה מתרחש כאשר תגובה ארסרגונית מאוד מפעילה תגובה אנדרגונית. התגובה המשולבת נקראת תגובה מצומדת.
תאים משתמשים בתגובות מצומדות כדי לבצע תהליכים שונים, כולל ביוסינתזה, הובלה פעילה של יונים ועבודה מכנית. הידרוליזה של ATP היא תגובה אקסרגונית מצומדת לעתים קרובות להפעלת תהליכים ביולוגיים.
לדוגמה, התגובה האנדרגונית בין גלוטמט ואמוניה ליצירת גלוטמין משולבת עם הידרוליזה אקסרגונית של ATP ל- ADP ופוספט אנאורגני.
שינוי האנרגיה החופשית נטו עבור התגובה המצומדת הוא סכום השינויים באנרגיה החופשית האינדיבידואלית. בגלל השלילי הגדול ΔG עבור הידרוליזה ATP, השינוי הכולל באנרגיה חופשית סטנדרטית הוא שלילי 16.3 kJ/mol, והתגובה יכולה להמשיך.
תגובות ביוסינתזה מצומדות חולקות לעתים קרובות מתווך משותף ולא יציב. בביוסינתזה של גלוטמין, העברת פוספט מ-ATP לגלוטמט יוצרת את הביניים גלוטמיל פוספט, אשר לאחר מכן מגיב עם אמוניה ליצירת גלוטמין.

תגובות מצומדות

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תהליכים תאיים כמו בנייה ופירוק של מולקולות מורכבות מתרחשים באמצעות תגובות כימיות שלביות. חלק מהתגובות הכימיות הללו הן ספונטניות ומשחררות אנרגיה, בעוד שאחרות דורשות אנרגיה כדי להמשיך. תאים לרוב מצמידים את התגובה המשחררת אנרגיה לתגובה הדורשת אנרגיה כדי לבצע תפקודים תאיים חשובים.

אנרגיה במולקולות אדנוזין טריפוספט או ATP נגישה בקלות לביצוע עבודה. ה-ATP מניע את רוב התגובות התאיות הדורשות אנרגיה. תאים מצמידים את ההידרוליזה של ATP עם תגובות אנדרגוניות המאפשרות להם להמשיך. דוגמה אחת לצימוד אנרגיה באמצעות ATP כוללת משאבת יונים טרנסממברנלית שחשובה ביותר לתפקוד התא. משאבת נתרן-אשלגן זו (משאבת Na+/K+) מוציאה נתרן מהתא ואשלגן לתוך התא. אחוז גדול מה-ATP של התא מניע את המשאבה הזו, מכיוון שתהליכים תאיים מכניסים כמות ניכרת של נתרן לתוך התא ואשלגן מתוכו. המשאבה פועלת ללא הרף לייצב את ריכוזי הנתרן והאשלגן בתא.

לעתים קרובות במהלך תגובות מטבוליות תאיות כגון סינתזה ופירוק של חומרים מזינים, מולקולות מסוימות חייבות להשתנות מעט במבנה שלהן כדי להפוך למצעים לשלב הבא בסדרת התגובה. דוגמה אחת היא בשלבים הראשונים של הנשימה התאית, כאשר מולקולת גלוקוז סוכר מתפרקת בגליקוליזה. בשלב הראשון, ATP נדרש לזרחן גלוקוז, יצירת תוצר ביניים עתיר אנרגיה אך לא יציב. תגובת זרחון זו מפעילה שינוי קונפורמטיבי המאפשר למולקולת הגלוקוז המזורחנת להפוך לפרוקטוז הסוכר המזורחן. פרוקטוז הוא תוצר ביניים הכרחי לגליקוליזה כדי להתקדם. כאן, התגובה האקסרגונית של הידרוליזת ATP מצומדת עם התגובה האנדרגונית של המרת גלוקוז לתוצר ביניים מזורחן במסלול. שוב, האנרגיה המשתחררת על ידי שבירת קשר פוספט בתוך ATP שימשה לזרחון מולקולה אחרת, יצירת תוצר ביניים לא יציב והנעת שינוי קונפורמטיבי חשוב.

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תהליכים תאיים כגון בנייה ופירוק של מולקולות מורכבות מתרחשים באמצעות תגובות כימיות בשלבים. חלק מהתגובות הכימיות הללו הן ...

Education

JoVE Core

Cell Biology

ביולוגיה של התא

Unit 1

יחידה 1

Energy and Catalysis

אנרגיה וקטליזה

KEY TERMS AND CONCEPTS

מונחים ומושגים מרכזיים

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

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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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ATP Powers Cellular Work

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