Eukaryotic proteins of the reticulon (RTN) family all share an association with the endoplasmic reticulum (ER). Whereas amino-terminal regions are not related to one another, all reticulon proteins share a 200 amino acid residue region of sequence similarity at the C-terminal. This region contains twolarge hydrophobic regions separated by a 66 residue hydrophilic segment. Theconserved hydrophobic C-terminal portion has been shown to play an essentialrole in the association of reticulons with the ER membrane. The hydrophobicportions are supposed to be membrane-embedded and the hydrophilic 66 residuelocalized to the lumenal/extracellular face of the membrane. Most reticulonshave a di-lysine ER retention motif at the C-terminal. Because of their likelyassociation with the rough as well as the smooth ER, the reticulons might playsome role in transport processes or in regulation of intracellular calciumlevels. It has been suggested that the reticulons may be serving as ER-associated channel-like complexes [1, 2, 3, 4].

1. NSP-encoded reticulons, neuroendocrine proteins of a novel gene family associated with membranes of the endoplasmic reticulum. J. Cell. Sci. 107 ( Pt 9), 2403-16
2. Genomic organization of the human NSP gene, prototype of a novel gene family encoding reticulons. Genomics 32, 191-9
3. cDNA cloning, genomic organization, and expression of the human RTN2 gene, a member of a gene family encoding reticulons. Genomics 51, 98-106
4. Identification of the Nogo inhibitor of axon regeneration as a Reticulon protein. Nature 403, 439-44

Eukaryotic proteins of the reticulon (RTN) family all share an association with the endoplasmic r
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