객관식
Consider a protein that is made in the rough endoplasmic reticulum. You observe that when the synthesis of the protein is completed, the protein is located in the ER membrane. Where else in the cell might this protein be found?
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2. Cell Chemistry & Cell Components
Endomembrane System: Protein Secretion
3:01분문제 2
교과서 질문
Which of the following results provided evidence of a discrete nuclear localization signal somewhere on the nucleoplasmin protein? a. The nucleoplasmin protein was small and easily slipped through the nuclear pore complex. b. After cleavage of the nucleoplasmin protein, only the tail segments appeared in the nucleus. c. Removing the tail from the nucleoplasmin protein allowed the core segment to enter the nucleus. d. The SRP bound only to the tail of the nucleoplasmin protein, not the core segment.
검증된 단계별 안내1
Identify the role of a nuclear localization signal (NLS) in protein transport to the nucleus.
Understand that a discrete NLS is a specific sequence within a protein that directs the protein to the nucleus.
Analyze each option to determine which one suggests the presence of a specific sequence responsible for nuclear localization.
Option a suggests passive diffusion, which does not indicate a specific NLS.
Option b indicates that the tail segments have a specific sequence allowing them to enter the nucleus, suggesting the presence of an NLS on the tail.
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3m주요 개념
질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.
Nuclear Localization Signal (NLS)
A Nuclear Localization Signal (NLS) is a specific amino acid sequence that enables proteins to be recognized and transported into the nucleus by the nuclear transport machinery. This signal is essential for proteins that function within the nucleus, as it directs their movement through the nuclear pore complex, which selectively allows the passage of molecules based on their signals.
추천 영상:
가이드 코스
2:15
Step 2: Release of Inflammatory Mediators & Other Cytokines
Nuclear Pore Complex (NPC)
The Nuclear Pore Complex (NPC) is a large protein structure embedded in the nuclear envelope that regulates the transport of molecules between the nucleus and the cytoplasm. It allows the passage of small molecules freely while requiring specific signals, like an NLS, for larger proteins to enter the nucleus, thus playing a critical role in cellular compartmentalization.
추천 영상:
가이드 코스
2:31Major Histocompatibility Complexes
Protein Segmentation and Function
Protein segmentation refers to the division of a protein into distinct functional regions, such as a core segment and a tail segment. In the context of nucleoplasmin, the core segment may contain the NLS necessary for nuclear entry, while the tail may have different roles. Understanding how these segments interact with cellular transport mechanisms is crucial for determining how proteins localize within the cell.
추천 영상:
가이드 코스
03:54Membrane Protein Functions
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