L5 Outline - BIO 320 CELL BIOLOGY Summer 2009 A De Lozanne...

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BIO 320 - CELL BIOLOGY – Summer 2009 A. De Lozanne Lecture 5 Coated Vesicles, Rabs and Snares Reading: Alberts, 5th Ed. Pages 749-766 Objectives • Describe the role of the various types of coated- and non-coated-vesicles in membrane trafficking. •  Identify and understand the roles of proteins that function in vesicle budding and fusion.  (COPI,  COPII, t-SNARE, v-SNARE, rabs) • Explain the signals used to target proteins to their appropriate cellular location. • Describe the steps involved in the process of exocytosis and its triggers. O UTLINE   OF  I MPORTANT  P OINTS : The Types of Vesicle Transport and Their Function I. Materials carried between membrane compartments by membrane-bound vesicles (50-75 nm  dia) A. Most budding vesicles covered on cytosolic surface by fuzzy electron-dense layer (protein coats) 1. Form from soluble proteins that reside in the cytosol; assemble on donor membrane cytosolic surface  at budding site 2. Coated buds pinch off to form coated vesicles B. Protein coats have at least two functions vesicle) II. Several distinct classes of coated vesicles identified - distinguished by proteins that make up  coat, appearance in EM, & role in cell trafficking; three are best studied A. COPII-coated vesicles - move materials from ER to Golgi (COP is acronym for co at p roteins).  Moves vesicles in the anterograde direction (forward in the secretory pathway) B. COPI-coated vesicles - move materials from Golgi complex back to ER (retrograde direction; away  from the secretory exit).   C.  Clathrin-coated vesicles: 
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This note was uploaded on 07/22/2009 for the course BIO 89545 taught by Professor De lozanne during the Spring '09 term at University of Texas.

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L5 Outline - BIO 320 CELL BIOLOGY Summer 2009 A De Lozanne...

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