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J Cell Biol March 6, 2000; 148 (5): 883-98.

In vitro formation of the endoplasmic reticulum occurs independently of microtubules by a controlled fusion reaction.

Dreier L , Rapoport TA .

We have established an in vitro system for the formation of the endoplasmic reticulum (ER). Starting from small membrane vesicles prepared from Xenopus laevis eggs, an elaborate network of membrane tubules is formed in the presence of cytosol. In the absence of cytosol, the vesicles only fuse to form large spheres. Network formation requires a ubiquitous cytosolic protein and nucleoside triphosphates, is sensitive to N-ethylmaleimide and high cytosolic Ca(2+) concentrations, and proceeds via an intermediate stage in which vesicles appear to be clustered. Microtubules are not required for membrane tubule and network formation. Formation of the ER network shares significant similarities with formation of the nuclear envelope. Our results suggest that the ER network forms in a process in which cytosolic factors modify and regulate a basic reaction of membrane vesicle fusion.

PubMed ID: 10704440
PMC ID: PMC2174540
Article link: J Cell Biol

Genes referenced: actl6a ccnb1 fubp1 grap2

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References [+] :
Allan, Organelle motility and membrane network formation in metaphase and interphase cell-free extracts. 1998, Pubmed, Xenbase

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