Membrane Structure Part One: Six Functions Of Membrane Proteins Flashcards Preview

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Flashcards in Membrane Structure Part One: Six Functions Of Membrane Proteins Deck (11):
1

The plasma membrane

Boundary that separates living cell from surroundings
Semi permeable
Lipids and proteins

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Cellular membrane consists of

Lipids and proteins!
>Phospholipids are
The most abundant lipid in plasma membrane
Contain hydrophilic and hydrophobic regions - phospho lipid bilayer

3

Fluidity of membranes

Phospholipids can move within the bilayer
Membrane proteins are dispersed and individually inserted into the phospholipid bilayer

4

A cell membrane

A cell membrane is a collage of different proteins embedded in the fluid matrix of the lipid bilayer

5

Six major functions of membrane proteins

Attachment to the cytoskeleton and extracellular matrix
Intercellular joining
Signal transduction
Enzymatic activity
Cell-cell recognition
Transport

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1. Attachment to cytoskeleton and extracellular matrix

Maintains cell shape and stabilizes cytoskeleton

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2. Intercellular joining

Proteins on adjacent cells hook together, briefly, for cell interaction/sharing

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3. Signal transduction

Transmission of molecular signals from a cell's exterior to its interior

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4. Enzymatic activity

When a protein built into the membrane may be an enzyme with its active site exposed to substances in the adjacent solution

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5. Cell-cell recognition

Cell's ability to distinguish one type of cell from another
When some glycoproteins (proteins bonded to short chains of sugars) serve as identification tags that are specifically recognized by other cells

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6. Transport

Transport proteins are used in various ways to move substances back and forth across the cell membrane