Integral Membrane Proteins

Integral Membrane Proteins

Permanently attached to the plasma membrane.

Channel Protein

Outer and inner surfaces of the cell membrane are polar so polar materials can't pass.

But....

this protein allows charged or polar

material to pass across the membrane.

example: aquaporin - allows water to transport through membrane

Carrier Protein

-protein molecule that combines with a charged material to transport it through the plasma membrane

-there are specific carrier proteins for

different types of charged particles

i.e sodium transport protein

Cell Recognition Protein

-glycoproteins that help the body to recognize when it is being invaded by pathogens so that the immune reaction can occur; without this recognition, pathogens would be able to freely invade the body

i.e Major Histocompatibility Complex

Receptor Protein

Attach to specific signal molecules to trigger a response in the cell.

i.e adrenaline signal molecules bind to adrenaline receptors to cause metabolic reactions

Enzymatic Protein

Enzymes that are anchored in the membrane to catalyze reactions with specific substrates.

Junction Protein

Connect adjacent cells together to form tissues.