Which among the following defines GPI anchored proteins?
Correct answer: C. Proteins that attach to lipids of the plasma membrane using specific anchors
- A. Integral proteins of the plasma membrane
- B. Proteins that bind to ion channels in the plasma membrane
- C. Proteins that attach to lipids of the plasma membrane using specific anchors
- D. Proteins that randomly associate with the plasma membrane
Explanation
Glycosyl phosphatidylinositol (GPI)-anchored proteins are peripheral membrane proteins that are connected to the cell membrane through a lipid anchor, specifically a GPI anchor. This unique attachment classifies them as peripheral proteins because they are not embedded within the lipid bilayer but are instead attached to it. This allows them to participate in various cellular processes, including signaling and cell-cell interactions.Option A is incorrect because integral proteins are embedded within the lipid bilayer, unlike GPI-anchored proteins. Option B is incorrect as it refers to proteins involved in ion channel interactions, which do not specifically involve GPI anchoring. Option D is incorrect because it suggests random association, whereas GPI-anchored proteins attach specifically through a lipid anchor.
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