Structural highlights
Function
[YPT1_YEAST] Involved in the trafficking of secretory vesicles from the endoplasmic reticulum (ER) to the Golgi. Regulates correct targeting and tethering of vesicles to target membranes by catalyzing the selective recruitment of proteins required for tethering and fusion onto membranes. Vesicular transport depends on shuttling of YPT1 between membrane and cytosol by GDI1, probably by recycling it to its membrane of origin after a vesicle fusion event. Required for sorting and transport of proteins from the ER through the Golgi compartment. Also involved in the recycling of membrane proteins.[1] [:][2] [3] [4] [5]
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
Rab GTPases regulate all stages of membrane trafficking, including vesicle budding, cargo sorting, transport, tethering and fusion. In the inactive (GDP-bound) conformation, accessory factors facilitate the targeting of Rab GTPases to intracellular compartments. After nucleotide exchange to the active (GTP-bound) conformation, Rab GTPases interact with functionally diverse effectors including lipid kinases, motor proteins and tethering complexes. How effectors distinguish between homologous Rab GTPases represents an unresolved problem with respect to the specificity of vesicular trafficking. Using a structural proteomic approach, we have determined the specificity and structural basis underlying the interaction of the multivalent effector rabenosyn-5 with the Rab family. The results demonstrate that even the structurally similar effector domains in rabenosyn-5 can achieve highly selective recognition of distinct subsets of Rab GTPases exclusively through interactions with the switch and interswitch regions. The observed specificity is determined at a family-wide level by structural diversity in the active conformation, which governs the spatial disposition of critical conserved recognition determinants, and by a small number of both positive and negative sequence determinants that allow further discrimination between Rab GTPases with similar switch conformations.
Structural basis of family-wide Rab GTPase recognition by rabenosyn-5.,Eathiraj S, Pan X, Ritacco C, Lambright DG Nature. 2005 Jul 21;436(7049):415-9. PMID:16034420[6]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Schmitt HD, Puzicha M, Gallwitz D. Study of a temperature-sensitive mutant of the ras-related YPT1 gene product in yeast suggests a role in the regulation of intracellular calcium. Cell. 1988 May 20;53(4):635-47. PMID:3286011
- ↑ Morsomme P, Riezman H. The Rab GTPase Ypt1p and tethering factors couple protein sorting at the ER to vesicle targeting to the Golgi apparatus. Dev Cell. 2002 Mar;2(3):307-17. PMID:11879636
- ↑ De Antoni A, Schmitzova J, Trepte HH, Gallwitz D, Albert S. Significance of GTP hydrolysis in Ypt1p-regulated endoplasmic reticulum to Golgi transport revealed by the analysis of two novel Ypt1-GAPs. J Biol Chem. 2002 Oct 25;277(43):41023-31. Epub 2002 Aug 19. PMID:12189143 doi:http://dx.doi.org/10.1074/jbc.M205783200
- ↑ Calero M, Chen CZ, Zhu W, Winand N, Havas KA, Gilbert PM, Burd CG, Collins RN. Dual prenylation is required for Rab protein localization and function. Mol Biol Cell. 2003 May;14(5):1852-67. Epub 2003 Feb 6. PMID:12802060 doi:10.1091/mbc.E02-11-0707
- ↑ Lafourcade C, Galan JM, Gloor Y, Haguenauer-Tsapis R, Peter M. The GTPase-activating enzyme Gyp1p is required for recycling of internalized membrane material by inactivation of the Rab/Ypt GTPase Ypt1p. Mol Cell Biol. 2004 May;24(9):3815-26. PMID:15082776
- ↑ Eathiraj S, Pan X, Ritacco C, Lambright DG. Structural basis of family-wide Rab GTPase recognition by rabenosyn-5. Nature. 2005 Jul 21;436(7049):415-9. PMID:16034420 doi:http://dx.doi.org/10.1038/nature03798
