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Synthesis, folding, modification, and transport of proteins
- endoplasmic reticulum (ER), in biology, a continuous membrane system that forms a series of flattened sacs within the cytoplasm of eukaryotic cells and serves multiple functions, being important particularly in the synthesis, folding, modification, and transport of proteins.
www.britannica.com › science › endoplasmic-reticulumEndoplasmic reticulum (ER) | Definition, Function, & Location
Apr 25, 2024 · endoplasmic reticulum (ER), in biology, a continuous membrane system that forms a series of flattened sacs within the cytoplasm of eukaryotic cells and serves multiple functions, being important particularly in the synthesis, folding, modification, and transport of proteins.
- Eukaryote
eukaryote, any cell or organism that possesses a clearly...
- Ribosome
Ribosome, particle that is present in large numbers in all...
- Lysosome
lysosome, subcellular organelle that is found in nearly all...
- Membrane
membrane, in biology, the thin layer that forms the outer...
- Rough Endoplasmic Reticulum
rough endoplasmic reticulum (RER), series of connected...
- Sarcoplasmic Reticulum
sarcoplasmic reticulum, intracellular system of closed...
- Eukaryote
- Structure
- Example
- Functions
- Roles
- Morphology
- Variations
- GeneratedCaptionsTabForHeroSec
The endoplasmic reticulum (ER) is a large organelle made of membranous sheets and tubules that begin near the nucleus and extend across the cell. The endoplasmic reticulum creates, packages, and secretes many of the products created by a cell. The entire structure can account for a large proportion of the endomembrane system of the cell. As seen in...
For instance, in cells such as liver hepatocytes that are specialized for protein secretion and detoxification, the ER can account for more than 50% of the total lipid bilayer of the cell. Similarly, the ER membrane system is particularly prominent in pancreatic beta cells that secrete insulin, or within activated B-lymphocytes that produce antibod...
ER sheets appear to be crucial in the response of the organelle to stress, especially since cells alter their tubules-to-sheets ratio when the number of unfolded proteins increases. Occasionally, apoptosis is induced by the ER in response to an excess of unfolded protein within the cell. When ribosomes detach from ER sheets, these structures can di...
Although ER sheets and tubules appear to have distinct functions, there isnt a perfect delineation of roles. For instance, in mammals tubules and sheets can interconvert, making the cells adaptable to various conditions. The relationship between structure and function in the ER has not been completely elucidated.
The endoplasmic reticulum membrane system can be morphologically divided into two structurescisternae and sheets. Cisternae are tubular in structure and form a three-dimensional polygonal network. They are about 50 nm in diameter in mammals and 30 nm in diameter in yeast. ER sheets, on the other hand, are membrane-enclosed, two-dimensional flattene...
The rough version of the endoplasmic reticulum is often closer to the nucleus, whereas the smooth endoplasmic reticulum is further from the nucleus. However, both versions are connected to each other and the nucleus through a series of small tubules.
The endoplasmic reticulum (ER) is a large organelle that creates, packages, and secretes many of the products of a cell. It also plays a role in protein synthesis, lipid metabolism, calcium storage, and stress response.
- Gabe Buckley
Functions. The endoplasmic reticulum serves many general functions, including the folding of protein molecules in sacs called cisternae and the transport of synthesized proteins in vesicles to the Golgi apparatus. Rough endoplasmic reticulum is also involved in protein synthesis.
Oct 3, 2015 · The endoplasmic reticulum (ER) is a large, dynamic structure that serves many roles in the cell including calcium storage, protein synthesis and lipid metabolism. The diverse functions of the ER are performed by distinct domains; consisting of tubules, sheets and the nuclear envelope.
- Dianne S. Schwarz, Dianne S. Schwarz, Michael D. Blower
- 10.1007/s00018-015-2052-6
- 2016
- Cell Mol Life Sci. 2016; 73: 79-94.
The SER’s functions include synthesis of carbohydrates, lipids, and steroid hormones; detoxification of medications and poisons; alcohol metabolism; and storage of calcium ions. In muscle cells, a specialized SER called the sarcoplasmic reticulum is responsible for storage of the calcium ions that are needed to trigger the coordinated ...
Dec 3, 2019 · The endoplasmic reticulum (ER) is an organelle that synthesizes, processes, and transports proteins and lipids in eukaryotic cells. It has two regions: rough ER with attached ribosomes and smooth ER without ribosomes.
May 14, 2022 · The endoplasmic reticulum is the site where the cell manufactures most of the membranes of the cell (plasma membrane, Golgi apparatus, lysosomes, nuclear envelope), lipids (including lipids for membranes, e.g., of the mitochondria, that are not made by the ER), and transmembrane proteins and secreted proteins.
