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Guide to Intracellular Protein Sorting and Trafficking Study Guide

This guide provides a comprehensive overview of receptor-mediated endocytosis, detailing the roles of ligands, receptors, clathrin, endosomes, and lysosomes in cellular uptake. It also touches upon the significance of this process in cellular regulation and disease.

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The Endomembrane System and Protein Sorting

The Endomembrane System and Protein Sorting

The endomembrane system involves the compartmentalization of function within organelles including the endoplasmic reticulum, Golgi complex, endosomes, and lysosomes.

  • Endomembrane system
  • Endoplasmic reticulum (ER)
  • Rough ER
  • Smooth ER
  • Protein synthesis and processing
  • Lipid synthesis
  • Drug detoxification
  • Carbohydrate metabolism
  • Steroid biosynthesis
  • Membrane biosynthesis
  • Hydroxylation
  • Glucose-6-phosphatase
  • HMG-CoA reductase

Structure and Function of the Golgi Apparatus

The Golgi apparatus is a series of membrane-bounded cisternae that processes, sorts, and packages glycoproteins and membrane lipids from the ER for transport.

  • Golgi apparatus
  • cisternae
  • cis-Golgi network (CGN)
  • trans-Golgi network (TGN)
  • medial cisternae
  • stationary cisternae model
  • cisternal maturation model
  • anterograde transport
  • retrograde transport
  • transport vesicles

ER and Golgi Protein Processing

Protein processing in the ER and Golgi apparatus includes protein folding, quality control, and glycosylation.

  • Retrograde transport
  • Protein folding
  • Quality control
  • N-linked glycosylation
  • O-linked glycosylation
  • Molecular chaperones
  • Disulfide bonds
  • Unfolded protein response (UPR)
  • ER-associated degradation (ERAD)
  • Dolichol phosphate
  • Cotranslational glycosylation
  • Calnexin and Calreticulin
  • UGGT
  • Terminal glycosylation
  • Protein tags

Intracellular Protein Sorting and Trafficking

Polypeptides are sorted via posttranslational import for organelles like mitochondria or cotranslational import for the endomembrane system.

  • Cotranslational import
  • Posttranslational import
  • Signal Recognition Particle (SRP)
  • Translocon
  • Endomembrane system
  • Anterograde and retrograde trafficking
  • Stop-transfer sequences
  • Start-transfer sequences

Transmembrane Protein Fate and Vesicular Transport

Processes including posttranslational import, exocytosis, and endocytosis facilitate the movement of proteins and materials across membranes.

  • Posttranslational import
  • Endomembrane system
  • Exocytosis
  • Endocytosis
  • Constitutive secretion
  • Regulated secretion
  • Polarized secretion
  • Phagocytosis
  • Pinocytosis

Mechanisms and Functions of Phagocytosis

Mechanisms and Functions of Phagocytosis

Phagocytosis involves the ingestion of large particles, whole cells, or microorganisms for nutrition in unicellular organisms or defense in specialized phagocytes.

  • Phagocytosis
  • Phagocytes
  • Neutrophils
  • Macrophages
  • Pseudopods
  • Phagosome
  • Lysosome
  • Immune Function

Receptor-Mediated Endocytosis and Vesicular Transport

Mechanisms of Receptor-Mediated Endocytosis

Cells use receptors on the outer cell surface to internalize macromolecules through receptor-mediated endocytosis.

  • Receptor-mediated endocytosis
  • Ligand-receptor complexes
  • Coated pits
  • Early endosomes
  • Late endosomes
  • Lysosomes
  • Transcytosis
  • Desensitization
  • Fluid-phase endocytosis

Coated Vesicles and Cellular Transport Processes

Coated vesicles utilize specific coat proteins to facilitate vesicular traffic throughout the endomembrane system, exocytosis, and endocytosis.

  • Coated vesicles
  • COP I
  • COP II
  • Caveolae
  • Adaptor protein (AP) complexes
  • SNARE proteins
  • v-SNAREs
  • t-SNAREs
  • Rab GTPases
  • Tethering proteins

Lysosomes and Cellular Digestion Processes

Lysosomes are organelles of the endomembrane system containing acid hydrolases that degrade biological macromolecules through heterophagic and autophagic pathways.

  • Lysosomes
  • Acid hydrolases
  • Endomembrane system
  • Endosome maturation
  • Heterophagic lysosomes
  • Autophagic lysosomes
  • Macroautophagy
  • Microautophagy
  • Lysosomal storage diseases

Plant Vacuoles and Peroxisome Functions

An analysis of the multifunctional plant vacuole and the diverse metabolic roles of peroxisomes.

  • Plant vacuole
  • Turgor pressure
  • Peroxisomes
  • Catalase
  • Hydrogen peroxide metabolism
  • Beta oxidation
  • Glyoxysomes
  • Peroxisome biogenesis

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