TAMU BIOL 213 - Cytoskeleton (9 pages)

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Lecture number:
Lecture Note
Texas A&M University
Biol 213 - Molecular Cell Biol

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BIOL 213 1st Edition Lecture 21 Outline of Last Lecture I Protein modification in the ER a Disulfide bond formation b Glycosylation II Exit of proteins from the ER is controlled a Chaperones hold onto misfolded proteins III Protein modification and sorting in the Golgi a Glycosylation and other signal sequences on the cargo proteins tell the vesicles where to go IV Exocytosis a Constitutive exocytosis pathway i Continuous b Regulated exocytosis pathway i Ex neurotransmitters V Endocytosis a Phagocytosis eating i Really large molecules like bacterial cells b Pinocytosis drinking i Smaller molecules ii Indiscriminate pinocytosis These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute 1 Continuous iii Receptor mediated endocytosis 1 Ex cholesterol VI Lysosomes a Three different pathways to a lysosome Outline of Current Lecture I Cytoskeleton II Intermediate filaments a Structure b Main functions c Two main different kinds i Cytoplasmic and nuclear lamins III Microtubules a Structure i Made of tubulin b Formed from centrosomes c Dynamic instability d Intracellular transport i Motor proteins dynein and kenisin e Mitosis IV Actin filaments a Structure b Growth occurs at both ends c Interaction with myosin to cause muscle contraction Current Lecture I II Cytoskeleton a This is like the cell s skeleton and muscles b It supports the cytosol and organelles c It allows the cell to move d There are three main types of protein filaments i Intermediate filaments 1 Proved mechanical strength ii Microtubules 1 Create cell polarity 2 Intracellular transport iii Actin filaments 1 Cell motility 2 Contraction Intermediate filaments a These are only found in eukaryotes b They are virtually indestructible c Structure i One helical region in a monomer 1 The helix is in the middle 2 The NH2 of one terminal amino acid caps one end while the COOH of the other terminal amino acid caps the other

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