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The Proteasome and Ubiquitin in Cells
Description
The cellular mechanism for protein degradation is based on a complex system where the protein ubiquitin tags damaged or unnecessary proteins for disposal. These marked proteins are then transported to the proteasome—a large protein complex that functions as a "protein shredder"—where they are broken down into their fundamental building blocks for recycling. Without the proper functioning of this mechanism, the cell cannot maintain its internal balance, leading to the potentially lethal accumulation of toxic proteins.
Original title
הפרוטאוזום והיוביקוויטין בתאים
מנגנון פירוק החלבונים בתא מבוסס על מערכת מורכבת שבה חלבון היוביקוויטין מסמן חלבונים פגומים או מיותרים לשינוע. החלבונים המסומנים מועברים אל הפרוטאוזום, קומפלקס חלבוני גדול המשמש כ"מגרסת חלבונים", שם הם מפורקים ליחידות הבניין שלהם לצורך מחזור. ללא פעילות תקינה של המנגנון הזה, התא לא יוכל לשמור על איזון וחלבונים רעילים עלולים להצטבר.
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