Structural highlights
Function
[GBRAP_HUMAN] May play a role in intracellular transport of GABA(A) receptors and its interaction with the cytoskeleton. Involved in apoptosis. Involved in autophagy (By similarity).[1] [CALR_HUMAN] Calcium-binding chaperone that promotes folding, oligomeric assembly and quality control in the endoplasmic reticulum (ER) via the calreticulin/calnexin cycle. This lectin interacts transiently with almost all of the monoglucosylated glycoproteins that are synthesized in the ER. Interacts with the DNA-binding domain of NR3C1 and mediates its nuclear export. Involved in maternal gene expression regulation. May participate in oocyte maturation via the regulation of calcium homeostasis (By similarity).[2] [3]
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
The 4-aminobutyrate type A receptor-associated protein (GABARAP) is a versatile adaptor protein that plays an important role in intracellular vesicle trafficking, particularly in neuronal cells. We have investigated the structural determinants underlying the interaction of GABARAP with calreticulin using spectroscopic and crystallographic techniques. Specifically, we present the crystal structure of GABARAP in complex with its major binding epitope on the chaperone. Molecular modeling of a complex containing full-length calreticulin suggests a novel mode of substrate interaction, which may have functional implications for the calreticulin/calnexin family in general.
Structural framework of the GABARAP-calreticulin interface--implications for substrate binding to endoplasmic reticulum chaperones.,Thielmann Y, Weiergraber OH, Mohrluder J, Willbold D FEBS J. 2009 Feb;276(4):1140-52. Epub 2009 Jan 16. PMID:19154346[4]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Lee JH, Rho SB, Chun T. GABAA receptor-associated protein (GABARAP) induces apoptosis by interacting with DEAD (Asp-Glu-Ala-Asp/His) box polypeptide 47 (DDX 47). Biotechnol Lett. 2005 May;27(9):623-8. PMID:15977068 doi:http://dx.doi.org/10.1007/s10529-005-3628-2
- ↑ Nauseef WM, McCormick SJ, Clark RA. Calreticulin functions as a molecular chaperone in the biosynthesis of myeloperoxidase. J Biol Chem. 1995 Mar 3;270(9):4741-7. PMID:7876246
- ↑ Holaska JM, Black BE, Love DC, Hanover JA, Leszyk J, Paschal BM. Calreticulin Is a receptor for nuclear export. J Cell Biol. 2001 Jan 8;152(1):127-40. PMID:11149926
- ↑ Thielmann Y, Weiergraber OH, Mohrluder J, Willbold D. Structural framework of the GABARAP-calreticulin interface--implications for substrate binding to endoplasmic reticulum chaperones. FEBS J. 2009 Feb;276(4):1140-52. Epub 2009 Jan 16. PMID:19154346 doi:10.1111/j.1742-4658.2008.06857.x
