Ribosomes are concerned with protein synthesis.

Stefano G, Renna L, Moss T, McNew JA and Brandizzi F (2012) In Arabidopsis, the spatial and dynamic organization of the endoplasmic reticulum and Golgi apparatus is influenced by the integrity of the C‐terminal domain of RHD3, a non‐essential GTPase. Plant Journal 69: 957–966.

Transmembrane proteins that attach to the Rough ER2.

SER does not contain this cell organelle, and hence the name smooth endoplasmic reticulum.

The Endoplasmic Reticulum - The Cell - NCBI Bookshelf

The plant endoplasmic reticulum (ER) is responsible for the synthesis and often storage of a large group of proteins and lipids that enter the secretory pathway. This multifunctional organelle, which also represents one of the calcium storage compartments in plant cells, has currently received considerable attention from the research community because of features unique to plants that make it particularly interesting for biotechnology. Here, the principles behind ER dynamics in plants, and the molecular factors that control the rapid remodelling and network configuration of the organelle are discussed. Correlations between ER morphology and function indicate the potential to enhance protein storage by merely increasing the capacity of the organelle through altering its shape.

Protein synthesis in the endoplasmic reticulum - …

The rough variety has ribosomes attached to the surface, which are sites for protein synthesis, while the smooth one is purely a transport system for the ions and steroids in particular.

SER looks like a group of smooth tubules, and is more tubular in shape than RER.

Endoplasmic reticulum - UniProt

Voeltz GK, Prinz WA, Shibata Y, Rist JM and Rapoport TA (2006) A class of membrane proteins shaping the tubular endoplasmic reticulum. Cell 124: 573–586.

The endoplasmic reticulum (ER) ..

Ueda H, Yokota E, Kutsuna N et al. (2010) Myosin‐dependent endoplasmic reticulum motility and F‐actin organization in plant cells. Proceedings of the National Academy of Sciences of the USA 107: 6894–6899.

the endoplasmic reticulum is thought to ..

Toyooka K, Okamoto T and Minamikawa T (2000) Mass transport of proform of a KDEL‐tailed cysteine proteinase (SH‐EP) to protein storage vacuoles by endoplasmic reticulum‐derived vesicle is involved in protein mobilization in germinating seeds. Journal of Cell Biology 148: 453–464.

reticulum participates in protein synthesis.

Yokota E, Ueda H, Hashimoto K et al. (2011) Myosin XI‐dependent formation of tubular structures from endoplasmic reticulum isolated from tobacco cultured cells, BY‐2. Plant Physiology 156: 129–143.

What is different about the protein that is destined for the rough endoplasmic reticulum?

Protein folding in the endoplasmic reticulum Protein synthesis

After the protein is synthesized, the ribosome dissociates into large and small subunits and the SRP also looses its attachment to the receptor.Â

SER also transports the products of RER to Golgi apparatus and other parts of the cell.

are concerned with protein synthesis.

Sparkes I, Tolley N, Aller I et al. (2010) Five Arabidopsis reticulon isoforms share endoplasmic reticulum location, topology, and membrane shaping properties. Plant Cell 22: 1333–1343.

All protein synthesis begins on ribosomes in the cytosol which are unattached to the ER ().

DNA/RNA/protein/endoplasmic reticulum/Golgi

Sparkes I, Hawes C and Frigerio L (2011) FrontiERs:movers and shapers of the higher plant cortical endoplasmic reticulum. Current Opinion in Plant Biology 14: 658–665.