EXS, C-terminal (IPR004342)

Short name: EXS_C

Overlapping homologous superfamilies


Domain relationships



The EXS domain is named after ERD1/XPR1/SYG1 and proteins containing this motif include the C-terminal of the SYG1 G-protein associated signal transduction protein from Saccharomyces cerevisiae, and sequences that are thought to be Murine leukemia virus (MLV) receptors (XPR1. The N-terminal of these proteins often have an SPX domain (IPR004331) [PMID: 9990033].

While the N-terminal is thought to be involved in signal transduction, the role of the C-terminal is not known. This region of similarity contains several predicted transmembrane helices. This family also includes the ERD1 (ERD: ER retention defective) S. cerevisiae proteins. ERD1 proteins are involved in the localization of endogenous endoplasmic reticulum (ER) proteins. Erd1 null mutants secrete such proteins even though they possess the C-terminal HDEL ER lumen localization label sequence. In addition, null mutants also exhibit defects in the Golgi-dependent processing of several glycoproteins, which led to the suggestion that the sorting of luminal ER proteins actually occurs in the Golgi, with subsequent return of these proteins to the ER via `salvage' vesicles [PMID: 2178921].

GO terms

Biological Process

No terms assigned in this category.

Molecular Function

No terms assigned in this category.

Cellular Component

GO:0016021 integral component of membrane

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.
PROSITE profiles