Difference between ser and rer pdf

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difference between ser and rer pdf

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Rough endoplasmic reticulum RER , series of connected flattened sacs, part of a continuous membrane organelle within the cytoplasm of eukaryotic cells , that plays a central role in the synthesis of proteins. The rough endoplasmic reticulum RER is so named for the appearance of its outer surface, which is studded with protein-synthesizing particles known as ribosomes.

The difference lies between the two is that the Smooth Endoplasmic Reticulum is not bounded by the ribosomes and is known for storing the lipids and proteins. Meanwhile, the Rough Endoplasmic Reticulum is bounded by the ribosomes and store proteins. The another most essential component of the eukaryotic cell is the Endoplasmic Reticulum or ER. It occupies almost 10 percent of the total cell volume. ER is of two type smooth and rough.

Difference Between Smooth and Rough Endoplasmic Reticulum

Subcellular structures of hepatocytes in periportal and perivenous zones were examined during 24 h. The volume, surface and numerical profile densities of cytoplasmic organelles were analysed morphometrically. Most subcellular structures in periportal and perivenous hepatocytes were subject to strong circadian variations. In hepatocytes from both zones, the volume densities of smooth endoplasmic reticulum sER , mitochondria, lysosomes, peroxisomes, polysomes and lipid droplets demonstrated peak values at However, the volume densities of glycogen granules and rough endoplasmic reticulum rER in periportal and perivenous hepatocytes exhibited maximal values at The surface densities of sER, mitochondria, lysosomes and peroxisomes, and the numerical profile densities of mitochondria, lysosomes and peroxisomes in periportal and perivenous hepatocytes showed similar trends.

Differentiate between Rough Endoplasmic Reticulum (RER) and Smooth Endoplasmic Reticulum (SER).

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The endoplasmic reticulum ER is, in essence, the transportation system of the eukaryotic cell, and has many other important functions such as protein folding. It is a type of organelle made up of two subunits — rough endoplasmic reticulum RER , and smooth endoplasmic reticulum SER. The endoplasmic reticulum is found in most eukaryotic cells and forms an interconnected network of flattened, membrane-enclosed sacs known as cisternae in the RER , and tubular structures in the SER. The membranes of the ER are continuous with the outer nuclear membrane. The endoplasmic reticulum is not found in red blood cells , or spermatozoa. The two types of ER share many of the same proteins and engage in certain common activities such as the synthesis of certain lipids and cholesterol.

The most basic difference between RER and SER is the presence of ribosomes. When ribosomes attach to the surface of an ER, it gives a characteristic rough.

A morphometric study of the variations in subcellular structures of rat hepatocytes during 24 hours

Structural organization of the endoplasmic reticulum. We can think of our rough endoplasmic reticulum as the primary protein folding and processing centre within the cell. Difference between smooth and rough endoplasmic reticulum.

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The endoplasmic reticulum ER is a key organelle of the secretion pathway involved in the synthesis of both proteins and lipids destined for multiple sites within and without the cell. The ER functions to both co- and post-translationally modify newly synthesized proteins and lipids and sort them for housekeeping within the ER and for transport to their sites of function away from the ER. In addition, the ER is involved in the metabolism and degradation of specific xenobiotics and endogenous biosynthetic products. A variety of proteomics studies have been reported on different subcompartments of the ER providing an ER protein dictionary with new data being made available on many protein complexes of relevance to the biology of the ER including the ribosome, the translocon, coatomer proteins, cytoskeletal proteins, folding proteins, the antigen-processing machinery, signaling proteins and proteins involved in membrane traffic. This review examines proteomics and cytological data in support of the presence of specific molecular machines at specific sites or subcompartments of the ER.

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