biomembranes and cell architecture

Architecture
1. Prokaryotes
  1. No organels, but do contain plasma membrane
    1. metabolites are thought to diffuse freely
    2. primitive cytoskeleton in some bacterias
2. Eucaryotes
  1. organels to develope its functions and plasma membrane
    1. unique complement of proteins in every organel
    2. nucleus and other organels in all cells
      1. Nucleus
        houses the genome of the cell
      2. Endosomes
        internalize plasma membrane proteins and soluble materials from the extracellular medium
      3. Lysosomes
        degrades worn.out or unneeded cellular components
      4. peroxisomes
        oxidize compunds that do not involve ATP process
      5. mitochondrias
        multiple functions for the cell including one of the most important process (production of atp)
      6. chloroplasts (in plant cells)
        absorbs light for the atp production of the plant
      7. Cytosol
        3 mayor proteins
        actin filaments, microtubules, and intermediate filament
        Cytoskeleton
        Structure and stability for the cell
Biomembranes
1. made of
  1. A phospholipid bilayer
    1. its principal compounds are
      1. -phosphoglycerides, sphingolipids and steroids
    2. lipids and many proteins are laterrally mobile in membranes
      1. Lipid rafts
        sites for signaling across the membrane
    3. Proteins
      1. integral and peripheral proteins
        integral proteins
        usually contain
        hydrophobic and hydrophilic domain
        from the cytosolic and exoplasmic faces of the membrane
        Porins
        Barell-like channel through the membrane
        peripheral proteins
        interact with integral proteins
        Are in the membrane "temporarily"

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biomembranes and cell architecture

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	Creado por javier matesanz hace más de 8 años