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Vesicular transport Dr. med. habil. Kőhidai László Assoc. Professor Depertment of Genetics, Cell- and Immunoibiology Semmelwesi University Semmelwesi University2008.
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Intracellular vesicular transport Communication – intracellular; Communication – intracellular; - cell-environment Membrane system Uptake of substances and transport to the place of digestion (lysosomes) - endocytosis Transport of proteins between ER-Golgi and to the surface membrane - exocitózis
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Main pathways of vesicular transport
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Intracellular vesicular transport Bidirectional, transport between compartment is balanced Continous recyclicling of membrane proteins
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Pathway of biosynthetic- and secretory processes Endocytosis Recycling
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Transport vesicles Membrane bounded vesicles filled with different cargos Secretion Secretion Lysosomal enzymes Lysosomal enzymes Components of surface membrane and the ECM Components of surface membrane and the ECM Direction of transport is determined by the components of the membrane see: donor and target compartments
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Molecular bases of vesicular transport Biosynthetic-secretory and endocytotic pathways join 10 or more compartments Direction of the transport and fusion are determined by molecular matching (receptor/ligand)
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Coated vesicles Role of the coat: Components of the membrane (e.g. receptors) are concentrated into patches Removal of coated surfaces and formation of vesicles
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Types of coated vesicles Clathrin-coated vesicles COPI-coated vesicles COPII-coated vesicles Each type of vesicle has its own transport
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We can distinguish the TEM morphology of the three types of vesicles
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Clathrin-coated vesicle: Golgi – surface mamembrane transport COPI- and COPII-coated vesicles: rER - Golgi transports
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The building block of the clathrin-coat: The triskelion The triskelion
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Clathrin-coat Triskelion zikk-zakk and globular structural elements
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Comparison of clathrin composition Light chain Heavy chain
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Protein-protein and protein-lipid associations under clathrin coat under clathrin coat
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Clathrin binding proteins in Mammals
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Alberts et all. Molecular Biology of the cell Releasing of clathrin-coated vesicles
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Role of dynamin in the process of vesicle release Dynamin is a G- protein, it binds and cleaves GTP Alberts et all. Molecular Biology of the cell Receptor-mediated endocytosis
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Alberts et all. Molecular Biology of the cell Receptor-mediated endocytosis
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Summary: Clathrin-coated vesicule
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Summary: COPII-coated vesicle
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Summary: COPI-coated vesicle
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Fusion of vesicle and target membrane (1)
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Fusion of vesicle and target membrane (2) NSF – N-ethylmaleimide sensitive factor SNAP – soluble NSF attachment protein SNAP-25 – synaptosomal associated protein 25 kDa VAMP – vesicle associated membrane protein
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A significant component of the vesicle-membrane fusion: a protonpump fusion: a protonpump a subunit –VPH1 d subunit VMA6 4c, c’ and c’’ subunit – VMA3, VMA11, VMA16
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Association of main components in membrane fusion SNAP-25 – synaptosomal associated protein 25 kDa VAMP – vesicle associated membrane proteinSNAP-25VAMP Syntaxin n-Sec1-syntaxinkomplex Syntaxin complex n-Sec1
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Vesicularis transport – „Budding”
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„Docking”
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„Kiss and run” fusion
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syntaxin VAMP SNAP-25 egyéb CCP – cl.-coated pit CCV – cl-coated vesic. DCV – dense core vesic. IC – intermed. comp. Subcellular distribution of SNARE proteins SNARE – soluble N-ethylmaleimide sensitive factor attachment protein receptor
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Role of G-proteins in vesicular trasport (1)
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Rab-cycle
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Role of G-proteins in vesicular trasport (2)
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Number of genes responsible for vesicular transport Phylogenetical approaches
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Evolution of SNARE-s S. cerevisiaeH. sapiens
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