Name: protein sorting in the golgi apparatus
Uploaded: 2026-06-01T06:28:27.713Z
Duration: 1 min 49 s
Channel: JoVE

K12 Standards

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North Carolina K-12 Science Standard Course of Study

9-12

Biology

from-molecules-to-organisms-structures-and-processes

From Molecules to Organisms- Structures and Processes

LS.Bio.1.3

Golgi Apparatus

The Golgi apparatus is a stack of disc-shaped, membrane-bound compartments called cisternae, with two distinct faces: the cis face and the trans face.Each cisterna contains unique enzymes and trafficking proteins that process proteins and lipids as they move through the Golgi.Proteins and lipids from the endoplasmic reticulum enter the cis-Golgi, then move through the medial cisternae, where enzymes add sugars, phosphates, or sulfates.These changes affect protein stability and activity and help guide proteins to the correct organelle.The trans-Golgi network is farthest from the endoplasmic reticulum. Here, molecules are sorted based on their final destination.During sorting, each molecule is tagged with a sorting signal that helps send it to the correct organelle.Finally, the cargo molecules are packaged into transport vesicles and sent to their destinations, such as the cell membrane, lysosomes, or the extracellular space.

golgi apparatus

As they leave the Endoplasmic Reticulum (ER), properly folded and assembled proteins are selectively packaged into vesicles. These vesicles are transported by microtubule-based motor proteins and fuse together to form vesicular tubular clusters, subsequently arriving at the Golgi apparatus, a eukaryotic endomembrane organelle that often has a distinctive ribbon-like appearance.The Golgi apparatus is a major sorting and dispatch station for the products of the ER. Newly arriving vesicles enter the cis face of the Golgi&#x2014;the side facing the ER&#x2014;and are transported through a collection of pancake-shaped, membrane-enclosed cisternae. Each cisterna contains unique compositions of enzymes and performs specific protein modifications. As proteins progress through the cis Golgi network, some are phosphorylated and undergo removal of certain carbohydrate modifications that were added in the ER. Proteins then move through the medial cisterna, where they may be glycosylated to form glycoproteins. After modification in the trans cisterna, proteins are given tags that define their cellular destination.Depending on the molecular tags, proteins are packaged into vesicles and trafficked to particular cellular locations, including the lysosome and plasma membrane. Specific markers on the membranes of these vesicles allow them to dock at the appropriate cellular location. In addition, membrane phospholipids can be modified in the Golgi and the Golgi can manufacture and secrete some polysaccharides.Interestingly, the Golgi fully disassembles and reassembles during cell division. Previously, the Golgi apparatus was understood as a static structure through which proteins progressively moved. More recently, scientists have begun to view the collection of Golgi cisternae as dynamic structures, advancing from the cis to the trans face of the network as a unit.

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Education

JoVE Core

Cellular Processes

Cell Structure and Function

KEY TERMS AND CONCEPTS

protein sorting in the golgi apparatus

The Golgi apparatus sorts and modifies proteins after they leave the endoplasmic reticulum (ER). Properly folded and assembled proteins are packaged into vesicles, or small membrane sacs, and moved by microtubule-based motor proteins. These vesicles can fuse into vesicular tubular clusters before reaching the Golgi, which often looks like a ribbon-shaped organelle in eukaryotic cells.

Vesicles enter the cis face of the Golgi, the side facing the ER. They pass through a set of pancake-shaped cisternae, which are membrane-enclosed compartments. Each cisterna contains a different group of enzymes, so each step can change the proteins in a specific way.

As proteins move through the cis Golgi network, some are phosphorylated, meaning a phosphate group is added. They can also lose certain carbohydrate modifications that were added in the ER. In the medial cisterna, proteins may be glycosylated, which means sugars are added to form glycoproteins.

After they reach the trans cisterna, proteins receive tags that help determine where they go in the cell. Based on these molecular tags, they are packed into new vesicles and sent to places such as the lysosome or the plasma membrane. Markers on the vesicle membranes help them dock at the correct destination.

The Golgi also changes membrane phospholipids and can make and secrete some polysaccharides. During cell division, the Golgi fully disassembles and then reassembles. Scientists once thought of it as a static structure, but it is now seen as a dynamic set of cisternae that moves from the cis to the trans face as a unit.

Protein Sorting in the Golgi Apparatus

what are cells?

Cell Membrane, DNA, and Organelles

Cells are the basic units of life, from a bacterium made of one cell to a human made of trillions. Even though organisms can differ greatly, their cells share key features that support life. A cell has a plasma membrane, which is a lipid bilayer that separates the cytoplasm from the outside environment. It also contains DNA, the genetic material that carries instructions for the cell. In prokaryotic cells, DNA is found in a region called the nucleoid. In eukaryotic cells, DNA is enclosed...

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Prokaryotic Cell Structures

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Cytoplasm and the Cell’s Internal Framework

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endoplasmic reticulum

ER in Protein and Lipid Transport

The endoplasmic reticulum is a membrane network in eukaryotic cells. It is continuous with the outer membrane of the nucleus. This connection helps link nuclear and cytoplasmic processes and supports efficient movement inside the cell. mRNA can move from the nucleus to ribosomes, which helps protein synthesis happen efficiently. The ER is a major site for making, processing, and distributing biomolecules. The rough endoplasmic reticulum has ribosomes attached to its surface. These ribosomes...

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How Ribosomes Build Proteins

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The Golgi apparatus sorts and modifies proteins after they leave the endoplasmic reticulum (ER). Properly folded and assembled proteins are packaged into vesicles, or small membrane sacs, and moved by microtubule-based motor proteins. These vesicles can fuse into vesicular tubular clusters before reaching the Golgi, which often looks like a ribbon-shaped organelle in eukaryotic cells. Vesicles enter the cis face of the Golgi, the side facing the ER. They pass through a set of pancake-shaped...

peroxisomes

Peroxisomes and Cellular Detoxification

Peroxisomes and mitochondria are two important oxygen-utilizing organelles in eukaryotic cells. Mitochondria carry out cellular respiration, which turns energy from food into ATP. Peroxisomes focus on breaking down substances such as fatty acids and other materials the cell needs to process. A peroxisome is a single membrane-bound organelle. It helps with lipid metabolism and chemical detoxification. Enzymes inside peroxisomes move hydrogen atoms from molecules to oxygen. This reaction...

microtubules

Microtubules in Cells and Cell Movement

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plant cell wall

Plant Cell Walls in Growth and Support

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the extracellular matrix

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the nucleus

Nuclear DNA and Cell Control

The nucleus is the control center of a eukaryotic cell. It is a membrane-bound organelle that contains chromosomal DNA. That DNA helps control gene expression and regulate protein production in the cell. Not all cellular DNA has the same role. The DNA in mitochondria and chloroplasts supports functions that are specific to those organelles. Inside the nucleus, DNA structure also affects how genes are regulated. Nuclear DNA is wrapped around proteins called histones. This forms chromatin, a...

tissues

Body Tissues and Their Jobs

Body tissues are groups of cells with similar structure and function. When different tissues work together, they form an organ with a specialized job. Vertebrates have four main tissue types: epithelial, connective, muscle, and nervous tissue. Epithelial tissue is made of thin sheets of cells. It covers the skin and lines internal organs and body cavities. These cells are tightly packed, so they help protect against injury, infection, and water loss. Epithelial tissue may be simple, with one...

gap junctions

Connexins and Cell-to-Cell Signaling

Gap junctions help animal cells send signals and share small materials with nearby cells. They are made of special proteins that form pores between neighboring cells and connect their cytoplasm. Through these channels, cells can exchange ions and other small molecules. These communication channels are found in many invertebrate and vertebrate species. They support important processes such as cell differentiation and development. They are also linked to human diseases, including disorders of...

key terms and concepts

Learn how the Golgi apparatus modifies proteins, adds tags, and sends them to the lysosome or plasma membrane in high school cell biology.

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biology

Pennsylvania State Academic Standards

Life Science

Structure and Function

3.1.9-12.A

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Ohio’s Learning Standards and Model Curriculum

Cells

Cell structure and function

Virginia  Standards of Learning

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From Molecules to Organisms: Structures and Processes

9-12.B.1.1

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SC.912.L.14

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Protein Sorting in the Golgi Apparatus

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