Which of the following is directly involved in driving protein import into the mitochondrial matrix space? A. GTP hydrolysis outside mitochondria B. Membrane potential across the outer membrane C. Light D. ATP hydrolysis inside mitochondria E. GTP hydrolysis inside mitochondria

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Answer:

The correct answer is D; ATP hydrolysis inside mitochondria

Explanation:

Proteins imports brought into the matrix of mitochondria are normally taken up from the cytosol in practically less time after their discharge from ribosomes. Transportation of protein imports into the matrix is driven by energy which is supplied by:

  • ATP hydrolysis outside the mitochondra: this occurs in the first step of translocation process. ATP hydrolysis drives the release of newly synthesized polypeptides from the hsp70 group of chaperone proteins.
  • an electrochemical proton gradient across the inner mitochondrial membrane maintained by electron transport process in the inner membrane.
  • ATP hydrolysis in the matrix: Hsp70 chaperone proteins in the matrix space likewise have a job in the translocation procedure, and they are the third point in the import procedure at which ATP is expended.

ATP hydrolysis inside mitochondria is directly involved in driving protein import into the mitochondrial matrix space. That is option D.

Transport of protein within the cell:

The cell is made up of cellular membrane bound organells which are capable of production of protein molecules.

An example of the organelle is the ribosomes from which proteins can be transfered to other parts of the cell( for example, the mitochondria).

The mitochondria which is also known as the power house of the cell is made up of many parts such as:

  • outer membrane
  • intermembrane space
  • inner membrane( also called the matrix)

The mitochondrial matrix holds the protein that is used by the organelle which is imported into the mitochondrial matrix space through the ATP hydrolysis inside mitochondria.

The matrix is impermeable to most molecules. It is through ATP hydrolysis inside the mitochondria that proteins can be transported into the mitochondrial matrix space.

Learn more about mitochondria here:

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