Final 3 Flashcards
Exocytosis that requires an external signal, a specific sorting signal on the vesicles, a clathrin coat, and increase of calcium
Regulated exocytosis
Exocytosis that serves to release components of ECM or just deliver newly PM proteins
Constitutive exocytosis
Why would a lysosome deposit its contents outside the cell?
Defense mechanism
Mark organelles and membrane domains in late secretory pathway
Phsophoinositides
What adds a phosphate onto the inositol ring of phosphatidylinositol
Lipid kinase
What removes a phosphate on the inositol ring of phsophatidylinositol?
Lipid phosphatase
How is neurotransmitter secretion very rapid?
Regulated by calcium
WHere does proteolytic processing occur?
Late Golgi
What holds SNARE proteins “partially-zipped up”
Complexin
Calcium snesor protein that allows the release of vesicle content by membrane fusion
Syanptotagmin
Example of compound exocytosis which provides a very large release of material over a short period of time
Histamines from mast cells
What kind of cells contain GLUT4
Insulin responsive cells (adipose, muscle)
Two compositionally distinct and different PMs
apical, basolateral
Where is the decision of what membrane a vesicle should go to in a polarized cell made?
TGN or all go to one membrane, and undergo endocytosis and sorting
How is iron transported into the cell?
Transferrin receptor
Fluid-phase endocytosis for uptake of fluids and solutes
Pinocytosis
Coat protein responsible for majority of vesicular traffic between TGN and PM
Clathrin
Composition of clathrin coats
Triskelion: 3 heavy chains and 3 light chains
Coat used for pinocytosis
Caveolae
Polyhedral superstructures that clathrin triskelion form
Cages
GTPase that constricts the neck of a newly formed coated pit to form a vesicle
Dyanmin
How is a clathrin coat removed?
HSP70 family of chaperones and its ATPase actiity
Storage form of cholesterol and primary vehicle for cholesterol transport in blood
Low-density lipoprotein (LDL)
Where in the cell are LDL particles broken down?
Lysosome
Clusters of LDL receptors in the PM
Coated pits
What does the cytosolic portion of LDL receptors do once associated with clathrin adapters?
Nucleates binding of a few clathrin triskelions to form coated pit
What happens to LDL receptors after endocytosis
Recycled into PM
How is LDL freed from its receptor?
pH change due to endosome
Separates and sequesters material to be degraded from material to be recycled
Mulitvesicular bodies (MVBs)
How are proteins recognized as needed to be degraded in MVBs?
Monoubiquination
Cytosolic protein complex that results in a specific accumulation of tagged protein into endosomal membrane invagination
ESCRT proteins
Ingestion of large particles restricted to macrophages and neutrophils
Phagocytosis
Movement of endocytosed material across the entire clel in membrane enclosed compartment
Transcytosis
What do cells unstimulated by insulin do?
Import glucose through the transporter
What do cells stimulated by insulin do?
Release glucose through exocytosis
Chemical bond formation linked to membrane transport process
Chemiosmotic coupling
High-energy electrons from NADH used to set up a proton gradient across IMM
Electron transport chain
Beta-barrel proteins on OMM
Porin
What size molecules are porins permeable to?
<5,000 daltons
Location of TCA and the source of NADH
Matrix
What is the movement of mitochondria mediated by?
Microtbulues
What generates more energy, FADH2 or NADH?
NADH
How many electrons does a NAD+ accept?
2
iElectrochemical gradient of protons in the mitochondria
Proton motive force (PMF)
What is the real name for ATP synthesis via electron transport chain
Oxidative phosphorylation
What does the complete oxidation of one glucose yield?
2 NADH, 2 ATP, 2 pyruvate
What are 2 pyruvates oxidized to?
8 NADH, 2 FADH, 2 GTP