The abundant glycoprotein in the basement membrane and has binding domain for both ECM and cell-surface receptor is
**Core Concept**
The question is testing the knowledge of a specific glycoprotein that plays a crucial role in the interaction between the extracellular matrix (ECM) and cell-surface receptors. This glycoprotein is essential for maintaining the structural integrity of the basement membrane and facilitating cell-ECM interactions.
**Why the Correct Answer is Right**
The correct answer is Laminin, a high-molecular-weight glycoprotein that is a major component of the basement membrane. Laminin has a binding domain for both the ECM and cell-surface receptors, specifically the integrins. This interaction enables cells to adhere to the ECM, which is critical for various cellular processes such as migration, proliferation, and differentiation. Laminin's binding domain for ECM components like collagen and nidogen, as well as its interaction with integrins, is crucial for maintaining tissue structure and function.
**Why Each Wrong Option is Incorrect**
**Option A:** There is no widely recognized glycoprotein that matches this description, and it is not a well-established component of the basement membrane.
**Option B:** Fibronectin is another glycoprotein that interacts with ECM components and cell-surface receptors, but it does not have the same binding domain for both ECM and cell-surface receptors as Laminin.
**Option C:** Collagen is a major component of the ECM but does not have a binding domain for cell-surface receptors.
**Clinical Pearl / High-Yield Fact**
Laminin is essential for maintaining the structural integrity of the basement membrane, and its dysfunction has been implicated in various diseases, including muscular dystrophy and certain types of cancer.
**Correct Answer:** C. Laminin