3rwm
From Proteopedia
Crystal Structure of Ypt32 in Complex with GppNHp
Structural highlights
Function[YPT32_YEAST] Required for protein transport through the secretory pathway. Probably involved in regulation of secretory vesicle formation at the trans-Golgi compartment. Mediates the proper polarized localization of SEC2, a GEF for SEC4, but does not alter the exchange activity of SEC2 on SEC4. Plays a role in autophagy.[1] [2] [3] [4] [5] Publication Abstract from PubMedRab GTPases localize to distinct sub-cellular compartments and regulate vesicle trafficking in eukaryotic cells. Yeast Rabs Ypt31/32 and Sec4 have 68% homology and bind to common interactors, yet play distinct roles in the transport of exocytic vesicles. The structures of Ypt31/32 have not previously been reported in the uncomplexed state. We describe the crystal structures of GTP and GDP forms of Ypt32 to understand the molecular basis for Rab function. The structure of Ypt32(GTP) reveals that the switch II conformation is distinct from Sec4(GTP) in spite of a highly conserved amino acid sequence. Also, Ypt32(GDP) reveals a remarkable change in conformation of the switch II helix induced by binding to GDI, which has not been described previously. The activation cycle of Rab GTPase Ypt32 reveals structural determinants of effector recruitment and GDI binding.,Sultana A, Jin Y, Dregger C, Franklin E, Weisman LS, Khan AR FEBS Lett. 2011 Oct 20. PMID:22024479[6] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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Categories: Baker's yeast | Large Structures | Dregger, C | Franklin, E | Jin, Y | Khan, A R | Sultana, A | Weisman, L S | Effector | Gppnhp | Myo2p | Protein transport | Rab gtpase | Vesicle trafficking | Ypt32
