5clq
From Proteopedia
Ran Y39A in complex with GPPNHP and RanBD1
Structural highlights
Disease[RBP2_HUMAN] Defects in RANBP2 are the cause of encephalopathy acute infection-induced type 3 (IIAE3) [MIM:608033]. A rapidly progressive encephalopathy manifesting in susceptibile individuals with seizures and coma. It can occur within days in otherwise healthy children after common viral infections such as influenza and parainfluenza, without evidence of viral infection of the brain or inflammatory cell infiltration. Brain T2-weighted magnetic resonance imaging reveals characteristic symmetric lesions present in the thalami, pons and brainstem. Note=Mutations in the RANBP2 gene predispose to IIAE3, but by themselves are insufficient to make the phenotype fully penetrant; additional genetic and environmental factors are required (PubMed:19118815).[1] Function[RAN_HUMAN] GTP-binding protein involved in nucleocytoplasmic transport. Required for the import of protein into the nucleus and also for RNA export. Involved in chromatin condensation and control of cell cycle (By similarity). The complex with BIRC5/ survivin plays a role in mitotic spindle formation by serving as a physical scaffold to help deliver the RAN effector molecule TPX2 to microtubules. Acts as a negative regulator of the kinase activity of VRK1 and VRK2.[2] [3] [4] [5] Enhances AR-mediated transactivation. Transactivation decreases as the poly-Gln length within AR increases.[6] [7] [8] [9] [RBP2_HUMAN] E3 SUMO-protein ligase which facilitates SUMO1 and SUMO2 conjugation by UBE2I. Involved in transport factor (Ran-GTP, karyopherin)-mediated protein import via the F-G repeat-containing domain which acts as a docking site for substrates. Could also have isomerase or chaperone activity and may bind RNA or DNA. Component of the nuclear export pathway. Specific docking site for the nuclear export factor exportin-1.[10] [11] [12] [13] Publication Abstract from PubMedSmall GTPases regulate key processes in cells. Malfunction of their GTPase reaction by mutations is involved in severe diseases. Here, we compare the GTPase reaction of the slower hydrolyzing GTPase Ran with Ras. By combination of time-resolved FTIR-difference spectroscopy and QM/MM simulations we elucidate that the Mg2+ coordination by the phosphate groups, which varies largely among the X-ray structures, is the same for Ran and Ras. A new X-ray structure of a Ran.RanBD1 complex with improved resolution confirmed this finding and revealed a general problem with the refinement of Mg2+ in GTPases. The Mg2+ coordination is not responsible for the much slower GTPase reaction of Ran. Instead, the location of the Tyr39 side chain of Ran between the gamma-phosphate and Gln69 prevents the optimal positioning of the attacking water molecule by the Gln69 relative to the gamma-phosphate. This is confirmed in the RanY39A.RanBD1 crystal structure. The QM/MM simulations provide IR spectra of the catalytic center which agree very nicely with the experimental ones. The combination of both methods can correlate spectra with structure at atomic detail. For example the FTIR difference spectra of RasA18T and RanT25A mutants show that spectral differences are mainly due to the hydrogen bond of Thr25 to the alpha-phosphate in Ran. By integration of X-ray structure analysis, experimental and theoretical IR spectroscopy the catalytic center of the X-ray structural models are further refined to sub-Angstrom resolution, allowing an improved understanding of catalysis. Catalysis of GTP hydrolysis by small GTPases at atomic detail by integration of X-ray crystallography, experimental and theoretical IR spectroscopy.,Rudack T, Jenrich S, Brucker S, Vetter IR, Gerwert K, Kotting C J Biol Chem. 2015 Aug 13. pii: jbc.M115.648071. PMID:26272610[14] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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